{"title":"Modules","description":"\u003cp\u003eReady-made building blocks. Browse the function modules that save you time — \u003cstrong\u003erelay boards, audio and MP3 modules, real-time clocks, RFID, and expansion boards\u003c\/strong\u003e — each one a job already done, ready to wire in.\u003c\/p\u003e\u003cp\u003eCompatible with Arduino, ESP32, and Raspberry Pi, genuine and tested, in stock with fast shipping across India, Cash on Delivery, and a GST invoice.\u003c\/p\u003e","products":[{"product_id":"hdmi-to-vga-converter-adapter-1080p-full-hd-male-to-female","title":"HDMI to VGA Converter Adapter 1080p Full HD - Male to Female","description":"\u003ch1\u003eHDMI to VGA Adapter (Male to Female) - Full HD 1080p Converter for PC\u003c\/h1\u003e\u003cp\u003eThe HDMI to VGA converter allows you to connect an HDMI source such as a laptop, PC, or media player to a VGA display like a monitor or projector. Supporting resolutions up to 1080p, it provides clear video output without any loss in quality. Ideal for presentations, home theater setups, and extending your desktop, this adapter is a practical solution when only VGA input is available.\u003c\/p\u003e\u003ch2\u003eKey Specifications\u003c\/h2\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Interface\u003c\/td\u003e\n\u003ctd\u003eHDMI Male (Type A)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Interface\u003c\/td\u003e\n\u003ctd\u003eVGA Female (HD D-Sub 15-pin)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Resolution\u003c\/td\u003e\n\u003ctd\u003e1920x1080 @ 60Hz (Full HD 1080p)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChipset\u003c\/td\u003e\n\u003ctd\u003eBuilt-in active signal conversion IC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eHDMI 1.3, 1.4, 2.0 sources (backward compatible)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower\u003c\/td\u003e\n\u003ctd\u003ePowered via HDMI port, no external adapter required\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch2\u003eWhat You Can Build With This\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eConnect a Raspberry Pi or single-board computer to an older VGA monitor\u003c\/li\u003e\n\u003cli\u003eUse with a laptop to turn a VGA projector into a large display for presentations\u003c\/li\u003e\n\u003cli\u003eConvert a set-top box or gaming console's HDMI output for use with legacy TVs or monitors that only accept VGA\u003c\/li\u003e\n\u003cli\u003eCreate a dual-monitor setup by connecting a second display through VGA from an HDMI port on your PC\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCompatibility\u003c\/h2\u003e\u003cp\u003eThis adapter is compatible with any device that outputs HDMI, including Raspberry Pi (all models), Windows PCs, MacBooks, Chromebooks, gaming consoles like PS4\/PS5, Xbox, and set-top boxes. For Raspberry Pi, ensure your OS is configured to output to HDMI by default. Requires a VGA display capable of 1080p resolution.\u003c\/p\u003e\u003ch2\u003eWiring Notes\u003c\/h2\u003e\u003cp\u003eSimply plug the HDMI male end into your source device, then connect a VGA cable (not included) from the adapter's female port to your display. No drivers or software installation needed. Ensure the VGA cable is securely connected on both ends, and for best performance, use a high-quality VGA cable with ferrite cores to avoid interference. Note: VGA does not transmit audio, so you'll need separate speakers if audio is required.\u003c\/p\u003e\u003ch2\u003eWhy Buy from Compoden\u003c\/h2\u003e\u003cp\u003eEvery component is sourced from verified suppliers and tested for compatibility before listing. We've spent 10 years building projects for makers, schools, and institutions across India. Ships from Bengaluru in 3-5 days. If defective on arrival, replace within 7 days.\u003c\/p\u003e\u003cdetails\u003e\u003csummary\u003eIs this compatible with Raspberry Pi?\u003c\/summary\u003e\u003cp\u003eYes, this adapter works with all Raspberry Pi models that have an HDMI output. Simply plug it into the HDMI port and connect a VGA monitor. No additional configuration is needed; the video signal will output automatically.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eDoes this adapter support audio?\u003c\/summary\u003e\u003cp\u003eNo, VGA is a video-only interface. To hear audio, you must use the audio output from your source device (e.g., 3.5mm headphone jack) or external speakers.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eDo I need external power for this adapter?\u003c\/summary\u003e\u003cp\u003eNo, the adapter is powered directly from the HDMI port of your source device. It does not require any external power supply.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdiv class=\"compoden-handoff\" style=\"margin-top:24px;padding:16px;background:#f0f4ff;border-left:4px solid #2B4D8F;border-radius:4px;\"\u003e\n  \u003cp style=\"margin:0 0 6px 0;font-weight:600;color:#1A3560;\"\u003e📦 Free Setup Handoff Document Included\u003c\/p\u003e\n  \u003cp style=\"margin:0;font-size:0.95em;color:#333;\"\u003eEvery Compoden order includes a free setup handoff document — step-by-step instructions to get your component working within minutes. Download it via QR code on your package. The handoff document is also trained to help you troubleshoot the majority of problems.\u003c\/p\u003e\n\u003c\/div\u003e\n","brand":"Compoden","offers":[{"title":"Default Title","offer_id":53444950360429,"sku":"CDN-0159","price":190.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0999\/3997\/5533\/files\/image_1_dfeef7c9-4d6c-4708-a0be-d35baedbf653.jpg?v=1781512240"},{"product_id":"pam8403-3w-stereo-audio-amplifier-module-5v-class-d","title":"PAM8403 3W Stereo Audio Amplifier Module | 5V Class D","description":"\u003ch1\u003ePAM8403 3W+3W Class D Stereo Audio Amplifier\u003c\/h1\u003e\u003cp\u003eThe PAM8403 is a compact class D stereo audio amplifier module capable of delivering 3 watts per channel into 4-ohm speakers using a 5V supply. It is ideal for battery-powered audio projects, portable speakers, and embedded sound systems where efficiency and minimal heat dissipation are critical.\u003c\/p\u003e\u003ch2\u003eKey Specifications\u003c\/h2\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupply Voltage\u003c\/td\u003e\n\u003ctd\u003e2.5V – 5.5V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Power\u003c\/td\u003e\n\u003ctd\u003e3W+3W (4Ω, 10% THD) at 5V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEfficiency\u003c\/td\u003e\n\u003ctd\u003eUp to 90%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSignal-to-Noise Ratio (SNR)\u003c\/td\u003e\n\u003ctd\u003e80dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChannel Separation\u003c\/td\u003e\n\u003ctd\u003e50dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQuiescent Current\u003c\/td\u003e\n\u003ctd\u003e~6mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch2\u003eWhat You Can Build With This\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003ePortable Bluetooth speaker powered by a 5V USB battery bank\u003c\/li\u003e\n\u003cli\u003eDIY mono or stereo computer speakers for workshops or classrooms\u003c\/li\u003e\n\u003cli\u003eAudio output stage for Raspberry Pi or Arduino music player projects\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/kit-pi-4-retro-gaming-console\"\u003eSmall arcade cabinet or retro gaming console audio system\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCompatibility\u003c\/h2\u003e\u003cp\u003eThe PAM8403 accepts standard line-level analog audio input and works directly with 3.3V or 5V boards such as Arduino Uno, ESP32, and Raspberry Pi Pico. It pairs well with Bluetooth modules like the HC-05 or CNY-70 for wireless audio streaming. No external amplification is needed for standard AUX or headphone outputs.\u003c\/p\u003e\u003ch2\u003eWiring Notes\u003c\/h2\u003e\u003cp\u003eConnect VCC to a clean 5V DC supply, GND to ground, and left\/right input pins to your audio source. Keep input wires short and away from speaker output wires to avoid noise. No external pull-ups or output filters are required.\u003c\/p\u003e\u003ch2\u003eWhy Buy from Compoden\u003c\/h2\u003e\u003cp\u003eEvery component is sourced from verified suppliers and tested for compatibility before listing. We've spent 10 years building projects for makers, schools, and institutions across India. Ships from Bengaluru in 3-5 days. If defective on arrival, replace within 7 days.\u003c\/p\u003e\u003cdetails\u003e\u003csummary\u003eIs this compatible with Arduino?\u003c\/summary\u003e\u003cp\u003eYes, simply connect the amplifier’s left\/right input to two Arduino PWM-capable pins for mono audio, or use a dedicated audio shield for stereo. Power the module from the Arduino’s 5V pin if current draw is within limits.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eCan I power it directly from a USB port?\u003c\/summary\u003e\u003cp\u003eAbsolutely. A standard USB port provides 5V, which is ideal for the PAM8403. Many projects use a micro-USB breakout or a phone charger to supply power.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eDoes it produce noticeable heat during operation?\u003c\/summary\u003e\u003cp\u003eNo, the PAM8403 is highly efficient and remains cool to the touch even at full volume, eliminating the need for heat sinks in most applications.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdiv class=\"compoden-handoff\" style=\"margin-top:24px;padding:16px;background:#f0f4ff;border-left:4px solid #2B4D8F;border-radius:4px;\"\u003e\n  \u003cp style=\"margin:0 0 6px 0;font-weight:600;color:#1A3560;\"\u003e📦 Free Setup Handoff Document Included\u003c\/p\u003e\n  \u003cp style=\"margin:0;font-size:0.95em;color:#333;\"\u003eEvery Compoden order includes a free setup handoff document — step-by-step instructions to get your component working within minutes. Download it via QR code on your package. The handoff document is also trained to help you troubleshoot the majority of problems.\u003c\/p\u003e\n\u003c\/div\u003e\n","brand":"Compoden","offers":[{"title":"Default Title","offer_id":53445052825965,"sku":"CDN-0870","price":120.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0999\/3997\/5533\/files\/image_1_1e5ea268-3e48-4d6c-b5a6-b7c219ce35ef.jpg?v=1781513078"},{"product_id":"3w-8-ohm-speaker-compact-audio-output-for-diy-electronics","title":"3W 8 Ohm Speaker – Compact Audio Output for DIY Electronics","description":"\u003ch1\u003e3W 8 Ohm Speaker – Compact Audio Output for DIY Electronics\u003c\/h1\u003e\u003cp\u003eThe 3W 8 Ohm speaker is a small, versatile audio transducer designed for hobbyist electronics, prototyping, and embedded sound projects. It delivers clear audio output at moderate volumes, making it suitable for alerts, music playback, and voice prompts in microcontroller-based builds. Its standard 8 Ohm impedance ensures broad compatibility with common audio amplifiers.\u003c\/p\u003e\u003ch2\u003eKey Specifications\u003c\/h2\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Rating\u003c\/td\u003e\n\u003ctd\u003e3 Watts (RMS)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImpedance\u003c\/td\u003e\n\u003ctd\u003e8 Ohms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e50 mm (approx.)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrequency Response\u003c\/td\u003e\n\u003ctd\u003e100 Hz – 15 kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnet Type\u003c\/td\u003e\n\u003ctd\u003eNeodymium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoice Coil\u003c\/td\u003e\n\u003ctd\u003e13 mm diameter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch2\u003eWhat You Can Build With This\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003ePortable Bluetooth speaker using an amplifier module\u003c\/li\u003e\n\u003cli\u003eArduino-based MP3 player with DFPlayer or similar\u003c\/li\u003e\n\u003cli\u003eCustom doorbell or alarm system with recorded audio\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/kit-pi-5-voice-assistant-kit\"\u003eEmbedded voice assistant with Raspberry Pi and TTS\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCompatibility\u003c\/h2\u003e\u003cp\u003eWorks with any microcontroller board that can drive audio through an external amplifier, such as Arduino Uno, ESP32, Raspberry Pi, or dedicated audio modules like DFPlayer Mini. Direct connection to GPIO pins is possible for simple tones, but an amplifier or transistor driver is recommended for full power and quality.\u003c\/p\u003e\u003ch2\u003eWiring Notes\u003c\/h2\u003e\u003cp\u003eConnect the speaker terminals to the output of a 3W or lower amplifier module (e.g., PAM8403). If driving from a microcontroller pin, use a 100 µF electrolytic capacitor in series to block DC and protect the coil. Keep wire runs short to minimize interference.\u003c\/p\u003e\u003ch2\u003eWhy Buy from Compoden\u003c\/h2\u003e\u003cp\u003eEvery component is sourced from verified suppliers and tested for compatibility before listing. We've spent 10 years building projects for makers, schools, and institutions across India. Ships from Bengaluru in 3-5 days. If defective on arrival, replace within 7 days.\u003c\/p\u003e\u003cdetails\u003e\u003csummary\u003eIs this compatible with Arduino Uno?\u003c\/summary\u003e\u003cp\u003eYes, when used with an external amplifier or a transistor driver. Direct GPIO output may produce weak sound and risk damage.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhat voltage is required?\u003c\/summary\u003e\u003cp\u003eThe speaker itself does not have a voltage rating; it's driven by an audio signal. The accompanying amplifier typically needs 3.3V to 5V DC.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eCan I use this for a loud alarm?\u003c\/summary\u003e\u003cp\u003eAt 3W, it produces moderate volume suitable for indoor alerts. For louder applications, consider a higher‑power speaker.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdiv class=\"compoden-handoff\" style=\"margin-top:24px;padding:16px;background:#f0f4ff;border-left:4px solid #2B4D8F;border-radius:4px;\"\u003e\n  \u003cp style=\"margin:0 0 6px 0;font-weight:600;color:#1A3560;\"\u003e📦 Free Setup Handoff Document Included\u003c\/p\u003e\n  \u003cp style=\"margin:0;font-size:0.95em;color:#333;\"\u003eEvery Compoden order includes a free setup handoff document — step-by-step instructions to get your component working within minutes. Download it via QR code on your package. The handoff document is also trained to help you troubleshoot the majority of problems.\u003c\/p\u003e\n\u003c\/div\u003e\n","brand":"Compoden","offers":[{"title":"Default Title","offer_id":53445052891501,"sku":"CDN-0871","price":95.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0999\/3997\/5533\/files\/image_1_4f2c52dd-50a3-4d23-b404-f53edf4c7c58.jpg?v=1781513079"},{"product_id":"microsd-card-32gb-class-10-uhs-i-memory-card","title":"MicroSD Card 32GB Class 10 UHS-I Memory Card","description":"\u003ch1\u003eMicroSD Card 32GB Class 10 UHS-I Memory Card\u003c\/h1\u003e\u003cp\u003eThe MicroSD Card 32GB is a high-capacity storage solution for embedded systems, single-board computers, and DIY electronics. It offers fast read\/write speeds with Class 10 UHS-I rating, ideal for operating system installations, data logging, and media storage. Pre-formatted with FAT32, it's ready to use with Raspberry Pi, Arduino SD card modules, and other compatible devices.\u003c\/p\u003e\u003ch2\u003eKey Specifications\u003c\/h2\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCapacity\u003c\/td\u003e\n\u003ctd\u003e32 GB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpeed Class\u003c\/td\u003e\n\u003ctd\u003eClass 10, UHS-I (U1)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRead Speed\u003c\/td\u003e\n\u003ctd\u003eUp to 80 MB\/s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWrite Speed\u003c\/td\u003e\n\u003ctd\u003eUp to 20 MB\/s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFile System\u003c\/td\u003e\n\u003ctd\u003eFAT32 (exFAT compatible)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e11mm x 15mm x 1mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch2\u003eWhat You Can Build With This\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/kit-pi-4-retro-gaming-console\"\u003eRaspberry Pi media center or retro gaming console\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/arduino-motion-data-logger-kit-timestamp-events-and-display-count-on-ole\"\u003eArduino data logger for temperature, humidity, or motion sensing\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003eStandalone MP3 player with audio module and speaker\u003c\/li\u003e\n\u003cli\u003eBackup storage for 3D printer control boards\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCompatibility\u003c\/h2\u003e\u003cp\u003eWorks with all Raspberry Pi models, Arduino boards via SPI SD card modules (e.g., CATALEX), and any device with a microSD slot supporting FAT32. Compatible with 3.3V and 5V logic when used with appropriate level shifters.\u003c\/p\u003e\u003ch2\u003eWiring Notes\u003c\/h2\u003e\u003cp\u003eFor Arduino SD card modules, connect CS to pin 4, MOSI to 11, MISO to 12, SCK to 13 (for Uno). Ensure card is formatted as FAT32 for best compatibility. Some modules may require pull-up resistors on data lines; check your module's datasheet.\u003c\/p\u003e\u003ch2\u003eWhy Buy from Compoden\u003c\/h2\u003e\u003cp\u003eEvery component is sourced from verified suppliers and tested for compatibility before listing. We've spent 10 years building projects for makers, schools, and institutions across India. Ships from Bengaluru in 3-5 days. If defective on arrival, replace within 7 days.\u003c\/p\u003e\u003cdetails\u003e\u003csummary\u003eIs this compatible with Raspberry Pi 5?\u003c\/summary\u003e\u003cp\u003eYes, the MicroSD Card 32GB works directly with Raspberry Pi 5's microSD slot. It is fully compatible with the latest Raspberry Pi OS and can be used as the primary boot device.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhat file system should I use?\u003c\/summary\u003e\u003cp\u003eFAT32 is recommended for broad compatibility, especially with microcontrollers and single-board computers. For files larger than 4GB, you may use exFAT if your device supports it.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eDoes it include an SD adapter?\u003c\/summary\u003e\u003cp\u003eThis listing is for the microSD card only. An SD adapter can be purchased separately if needed.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdiv class=\"compoden-handoff\" style=\"margin-top:24px;padding:16px;background:#f0f4ff;border-left:4px solid #2B4D8F;border-radius:4px;\"\u003e\n  \u003cp style=\"margin:0 0 6px 0;font-weight:600;color:#1A3560;\"\u003e📦 Free Setup Handoff Document Included\u003c\/p\u003e\n  \u003cp style=\"margin:0;font-size:0.95em;color:#333;\"\u003eEvery Compoden order includes a free setup handoff document — step-by-step instructions to get your component working within minutes. Download it via QR code on your package. The handoff document is also trained to help you troubleshoot the majority of problems.\u003c\/p\u003e\n\u003c\/div\u003e\n","brand":"Compoden","offers":[{"title":"Default Title","offer_id":53445054202221,"sku":"CDN-0873","price":470.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0999\/3997\/5533\/files\/image_1_7a1ac967-91b6-4860-b675-37570b981555.jpg?v=1781513087"},{"product_id":"crocodile-clips-10-pack-50mm-pvc-sleeve-5a-rating","title":"Crocodile Clips - 10-Pack, 50mm, PVC Sleeve, 5A Rating","description":"\u003ch1\u003eCrocodile Clips – 10-Pack with PVC Sleeve, 5A Current Rating\u003c\/h1\u003e\u003cp\u003eCrocodile clips (also known as alligator clips) are spring-loaded metal clamps with serrated jaws, used for creating temporary electrical connections. Ideal for prototyping, testing, and low-current applications, these clips feature durable nickel-plated steel construction and a flexible PVC insulating sleeve for safety. The pack includes 10 clips in mixed colours, each 50 mm long with a 10 mm jaw opening, making them suitable for gripping wires, component leads, and terminal posts.\u003c\/p\u003e\u003ch2\u003eKey Specifications\u003c\/h2\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eNickel-plated steel jaw, copper shank\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInsulation\u003c\/td\u003e\n\u003ctd\u003ePVC sleeve (mixed colours)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOverall Length\u003c\/td\u003e\n\u003ctd\u003e50 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eJaw Opening\u003c\/td\u003e\n\u003ctd\u003e~10 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent Rating\u003c\/td\u003e\n\u003ctd\u003e5 A (max continuous)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnector Type\u003c\/td\u003e\n\u003ctd\u003e4 mm banana socket\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch2\u003eWhat You Can Build With This\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eDIY test leads for multimeters or power supplies\u003c\/li\u003e\n\u003cli\u003eTemporary battery connections in prototype circuits\u003c\/li\u003e\n\u003cli\u003eSensor or actuator hookups on breadboards\u003c\/li\u003e\n\u003cli\u003eEducational electronics kits for schools and makerspaces\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCompatibility\u003c\/h2\u003e\u003cp\u003eThese crocodile clips are compatible with standard 4 mm banana plugs, common on multimeter probes and power supply leads. They work with all microcontrollers and single-board computers (Arduino, Raspberry Pi, ESP32) when used with appropriate jumper wires. The 5 A rating suits most low-voltage DC projects under 30 V.\u003c\/p\u003e\u003ch2\u003eWiring Notes\u003c\/h2\u003e\u003cp\u003eFor secure connections, open the jaws by pressing the insulated handles, insert the wire or pin, and release. Avoid clamping onto very fine leads that may slip out; double-check the grip before powering on. Do not exceed the current rating, and avoid flexing the PVC sleeve near the jaw pivot to prevent tearing.\u003c\/p\u003e\u003ch2\u003eWhy Buy from Compoden\u003c\/h2\u003e\u003cp\u003eEvery component is sourced from verified suppliers and tested for compatibility before listing. We've spent 10 years building projects for makers, schools, and institutions across India. Ships from Bengaluru in 3-5 days. If defective on arrival, replace within 7 days.\u003c\/p\u003e\u003cdetails\u003e\u003csummary\u003eIs this compatible with Arduino?\u003c\/summary\u003e\u003cp\u003eYes, the clips work perfectly with Arduino projects. Simply connect a banana plug lead from the clip to your breadboard or directly to a male header pin; the jaw grips 0.1-inch pins securely.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhat is the maximum current I can safely use?\u003c\/summary\u003e\u003cp\u003eThe clips are rated for up to 5 A continuous current. For intermittent use, they can handle brief surges up to 8 A, but prolonged overloading may cause heating.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eHow many clips are in the pack?\u003c\/summary\u003e\u003cp\u003eThis pack contains 10 crocodile clips, five red and five black, each 50 mm long with a PVC sleeve. They are ready to solder or use with 4 mm banana plugs.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdiv class=\"compoden-handoff\" style=\"margin-top:24px;padding:16px;background:#f0f4ff;border-left:4px solid #2B4D8F;border-radius:4px;\"\u003e\n  \u003cp style=\"margin:0 0 6px 0;font-weight:600;color:#1A3560;\"\u003e📦 Free Setup Handoff Document Included\u003c\/p\u003e\n  \u003cp style=\"margin:0;font-size:0.95em;color:#333;\"\u003eEvery Compoden order includes a free setup handoff document — step-by-step instructions to get your component working within minutes. Download it via QR code on your package. The handoff document is also trained to help you troubleshoot the majority of problems.\u003c\/p\u003e\n\u003c\/div\u003e\n","brand":"Compoden","offers":[{"title":"Default Title","offer_id":53445067604333,"sku":"CDN-0900","price":95.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0999\/3997\/5533\/files\/download_a5499540-1839-4666-855d-a1df3778db11.jpg?v=1781524584"},{"product_id":"microsd-card-8gb-class-10-flash-memory-compodenin","title":"MicroSD Card 8GB Class 10 Flash Memory | compoden.in","description":"\u003ch1\u003eMicroSD Card 8GB – Class 10 Flash Memory Storage\u003c\/h1\u003e\n\n\u003cp\u003eThe 8GB MicroSD card provides reliable flash storage for microcontrollers, single-board computers, and embedded systems. Use it for data logging, media playback, or firmware storage. Compatible with SPI and SD modes, it works with popular platforms like Arduino and Raspberry Pi.\u003c\/p\u003e\n\n\u003ch2\u003eKey Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCapacity\u003c\/td\u003e\n\u003ctd\u003e8GB\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSpeed Class\u003c\/td\u003e\n\u003ctd\u003eClass 10 (UHS-I U1)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eVoltage Range\u003c\/td\u003e\n\u003ctd\u003e2.7V – 3.6V\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eInterface\u003c\/td\u003e\n\u003ctd\u003eSPI \/ SD\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eForm Factor\u003c\/td\u003e\n\u003ctd\u003eMicroSD\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e-25°C to 85°C\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWhat You Can Build With This\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/kit-cold-chain-temperature-data-logger\"\u003eArduino data logger with temperature and humidity sensors\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/kit-pi-4-retro-gaming-console\"\u003eRaspberry Pi retro gaming console\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003ePortable MP3 player with a DFPlayer module\u003c\/li\u003e\n  \u003cli\u003eDIY digital photo frame using an ESP32\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eThis card works with any device that has a microSD slot or an SD adapter, including Arduino (with SD card module), Raspberry Pi, ESP32, and other development boards. It supports both 3.3V and 5V systems when used with a logic level shifter.\u003c\/p\u003e\n\n\u003ch2\u003eWiring Notes\u003c\/h2\u003e\n\u003cp\u003eWhen using with an Arduino, connect the CS, MOSI, MISO, and SCK pins of the SD module to digital pins 4, 11, 12, and 13 respectively (for Uno). Ensure you use a module with built-in level shifting, as the microSD operates at 3.3V.\u003c\/p\u003e\n\n\u003ch2\u003eWhy Buy from Compoden\u003c\/h2\u003e\n\u003cp\u003eEvery component is sourced from verified suppliers and tested for compatibility before listing. We've spent 10 years building projects for makers, schools, and institutions across India. Ships from Bengaluru in 3-5 days. If defective on arrival, replace within 7 days.\u003c\/p\u003e\n\n\u003cdetails\u003e\u003csummary\u003eIs this compatible with Arduino?\u003c\/summary\u003e\u003cp\u003eYes, with an SD card module (like the common SPI breakout board) it works with all Arduino boards. Use the SD library in the Arduino IDE.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eCan I use it with Raspberry Pi?\u003c\/summary\u003e\u003cp\u003eAbsolutely. Insert the card into the microSD slot on the Raspberry Pi and flash the OS image. 8GB is sufficient for Raspberry Pi OS Lite.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat is the actual usable storage?\u003c\/summary\u003e\u003cp\u003eFormatting reduces available space to about 7.4GB. This is normal for all storage devices.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdiv class=\"compoden-handoff\" style=\"margin-top:24px;padding:16px;background:#f0f4ff;border-left:4px solid #2B4D8F;border-radius:4px;\"\u003e\n  \u003cp style=\"margin:0 0 6px 0;font-weight:600;color:#1A3560;\"\u003e📦 Free Setup Handoff Document Included\u003c\/p\u003e\n  \u003cp style=\"margin:0;font-size:0.95em;color:#333;\"\u003eEvery Compoden order includes a free setup handoff document — step-by-step instructions to get your component working within minutes. Download it via QR code on your package. The handoff document is also trained to help you troubleshoot the majority of problems.\u003c\/p\u003e\n\u003c\/div\u003e\n","brand":"Compoden","offers":[{"title":"Default Title","offer_id":53445071110509,"sku":"CDN-0911","price":240.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0999\/3997\/5533\/files\/image_1_3391a02a-73b2-4ad1-897a-d10274383a33.jpg?v=1781513149"},{"product_id":"mini-submersible-pump-compact-dc-water-pump-36v","title":"Mini Submersible Pump – Compact DC Water Pump, 3–6V","description":"\u003ch1\u003eMini Submersible Pump — 3–6V DC Water Pump\u003c\/h1\u003e\u003cp\u003eThe Mini Submersible Pump is a compact, low-voltage DC pump designed for small-scale water movement in DIY electronics, hydroponics, and aquaria. Ideal for projects requiring gentle flow and silent operation, it can be fully submerged, drawing water from shallow containers or sumps.\u003c\/p\u003e\u003ch2\u003eKey Specifications\u003c\/h2\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Voltage\u003c\/td\u003e\n\u003ctd\u003e3–6V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlow Rate\u003c\/td\u003e\n\u003ctd\u003e80–120 L\/h (varies with voltage)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSubmersible Depth\u003c\/td\u003e\n\u003ctd\u003eUp to 0.5m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCable Length\u003c\/td\u003e\n\u003ctd\u003eApprox. 50cm (tinned leads)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e35mm x 30mm x 25mm (approx.)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e~0.6W @ 3V, ~1.5W @ 6V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch2\u003eWhat You Can Build With This\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/kit-automatic-plant-watering-system\"\u003eAutomatic plant watering system using a soil moisture sensor\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003eDesktop water fountain or mini waterfall display\u003c\/li\u003e\n\u003cli\u003eAquarium water circulation or small sump system\u003c\/li\u003e\n\u003cli\u003eLiquid cooling loop for electronic components or small projects\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCompatibility\u003c\/h2\u003e\u003cp\u003eThe pump works with any 3–6V DC power source. It can be directly driven from a MOSFET or transistor with an Arduino, ESP8266, or Raspberry Pi. Ensure your microcontroller provides enough current via a driver circuit; a flyback diode is recommended to protect against voltage spikes.\u003c\/p\u003e\u003ch2\u003eWiring Notes\u003c\/h2\u003e\u003cp\u003eConnect the red wire to positive (+) and black to negative (−). Use a 2N2222 transistor or L293D motor driver for speed control. Never run the pump dry for extended periods, as water acts as its lubricant and coolant.\u003c\/p\u003e\u003ch2\u003eWhy Buy from Compoden\u003c\/h2\u003e\u003cp\u003eEvery component is sourced from verified suppliers and tested for compatibility before listing. We've spent 10 years building projects for makers, schools, and institutions across India. Ships from Bengaluru in 3-5 days. If defective on arrival, replace within 7 days.\u003c\/p\u003e\u003cdetails\u003e\u003csummary\u003eIs this compatible with Arduino Uno?\u003c\/summary\u003e\u003cp\u003eYes, when driven via a transistor or motor driver shield. Direct connection may exceed pin current limits.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eCan I run this pump continuously?\u003c\/summary\u003e\u003cp\u003eIt is rated for intermittent use. Continuous operation above 4 hours may reduce lifespan; allow cool-down periods.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhat is the maximum lift height?\u003c\/summary\u003e\u003cp\u003eThe pump can lift water up to 0.6 metres vertically; flow rate decreases significantly above 0.4m.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdiv class=\"compoden-handoff\" style=\"margin-top:24px;padding:16px;background:#f0f4ff;border-left:4px solid #2B4D8F;border-radius:4px;\"\u003e\n  \u003cp style=\"margin:0 0 6px 0;font-weight:600;color:#1A3560;\"\u003e📦 Free Setup Handoff Document Included\u003c\/p\u003e\n  \u003cp style=\"margin:0;font-size:0.95em;color:#333;\"\u003eEvery Compoden order includes a free setup handoff document — step-by-step instructions to get your component working within minutes. Download it via QR code on your package. The handoff document is also trained to help you troubleshoot the majority of problems.\u003c\/p\u003e\n\u003c\/div\u003e\n","brand":"Compoden","offers":[{"title":"Default Title","offer_id":53445080678765,"sku":"CDN-0932","price":180.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0999\/3997\/5533\/files\/image_1_4914be8f-e603-48ba-9c92-85c35fed57c5.jpg?v=1781513185"},{"product_id":"mcp4728-12-bit-4-channel-dac-module-i2c-interface","title":"MCP4728 12-Bit 4-Channel DAC Module - I2C Interface","description":"\u003ch1\u003eMCP4728 12-Bit 4-Channel DAC with I2C and EEPROM\u003c\/h1\u003e\n\n\u003cp\u003eThe MCP4728 is a quad-channel, 12-bit digital-to-analog converter with on‑board EEPROM and an I2C interface. It provides four independent analog voltage outputs from a single device, making it ideal for precision control applications such as sensor simulation, waveform generation, and voltage calibration. With built‑in reference options and low power consumption, it integrates seamlessly into microcontroller projects.\u003c\/p\u003e\n\n\u003ch2\u003eKey Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eResolution\u003c\/td\u003e\n\u003ctd\u003e12 bits\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eChannels\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eInterface\u003c\/td\u003e\n\u003ctd\u003eI2C (address selectable via A0 pin)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSupply Voltage\u003c\/td\u003e\n\u003ctd\u003e2.7V to 5.5V\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eInternal Reference\u003c\/td\u003e\n\u003ctd\u003e2.048V (can use external VREF)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eEEPROM\u003c\/td\u003e\n\u003ctd\u003eIntegrated (stores DAC settings)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWhat You Can Build With This\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eProgrammable multi‑channel voltage source for testing\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/esp32-waveform-generator-kit-build-4-waveforms-with-web-ui\"\u003eAudio waveform generator (e.g., sine, square, triangle)\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003eSensor output simulator (e.g., pressure, temperature)\u003c\/li\u003e\n  \u003cli\u003ePrecision LED brightness control with multiple independent channels\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eThis DAC operates on 3.3V and 5V logic, making it fully compatible with Arduino, Raspberry Pi, ESP32, and any microcontroller that supports I2C. The module works out of the box with the standard Wire library on Arduino and the smbus2 library on Raspberry Pi.\u003c\/p\u003e\n\n\u003ch2\u003eWiring Notes\u003c\/h2\u003e\n\u003cp\u003eConnect VCC to 3.3V or 5V, GND to ground, and SDA\/SCL to your microcontroller's I2C pins. The module includes onboard pull‑up resistors, so external pull‑ups are not required for most setups. For external reference, connect a stable voltage (up to VCC) to the VREF pin; leave it unconnected to use the internal 2.048V reference.\u003c\/p\u003e\n\n\u003ch2\u003eWhy Buy from Compoden\u003c\/h2\u003e\n\u003cp\u003eEvery component is sourced from verified suppliers and tested for compatibility before listing. We've spent 10 years building projects for makers, schools, and institutions across India. Ships from Bengaluru in 3-5 days. If defective on arrival, replace within 7 days.\u003c\/p\u003e\n\n\u003cdetails\u003e\u003csummary\u003eIs this compatible with Arduino?\u003c\/summary\u003e\u003cp\u003eYes, the MCP4728 module works directly with Arduino using the Wire library. Set the I2C address (default 0x60) and send 12‑bit values for each channel.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eCan I use an external voltage reference?\u003c\/summary\u003e\u003cp\u003eAbsolutely. The VREF pin allows an external reference up to the supply voltage. When an external reference is applied, the internal 2.048V reference is automatically overridden.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eDoes it retain settings after power is removed?\u003c\/summary\u003e\u003cp\u003eYes. The integrated EEPROM stores DAC register values and configuration bits, so your last settings are restored upon power-up if saved before shutdown.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdiv class=\"compoden-handoff\" style=\"margin-top:24px;padding:16px;background:#f0f4ff;border-left:4px solid #2B4D8F;border-radius:4px;\"\u003e\n  \u003cp style=\"margin:0 0 6px 0;font-weight:600;color:#1A3560;\"\u003e📦 Free Setup Handoff Document Included\u003c\/p\u003e\n  \u003cp style=\"margin:0;font-size:0.95em;color:#333;\"\u003eEvery Compoden order includes a free setup handoff document — step-by-step instructions to get your component working within minutes. Download it via QR code on your package. The handoff document is also trained to help you troubleshoot the majority of problems.\u003c\/p\u003e\n\u003c\/div\u003e\n","brand":"Compoden","offers":[{"title":"Default Title","offer_id":53445080744301,"sku":"CDN-0936","price":350.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0999\/3997\/5533\/files\/download_8e60706b-f22e-4a8e-be9a-dda9c53ac089.jpg?v=1781592458"},{"product_id":"ad9833-dds-signal-generator-module-0-125mhz-sinetrianglesquare-wave","title":"AD9833 DDS Signal Generator Module — 0-12.5MHz Sine\/Triangle\/Square Wave","description":"\u003ch1\u003eAD9833 DDS Signal Generator Module — 0-12.5MHz Programmable Waveform\u003c\/h1\u003e\n\u003cp\u003eThe AD9833 is a low-power, programmable waveform generator IC capable of producing sine, triangle, and square waves. This breakout module lets you easily interface with microcontrollers to create precise frequency signals for testing, audio, and RF projects. Ideal for function generators, sensor excitation, and waveform synthesis.\u003c\/p\u003e\n\u003ch2\u003eKey Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eOutput Waveforms\u003c\/td\u003e\n\u003ctd\u003eSine, triangle, square\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eFrequency Range\u003c\/td\u003e\n\u003ctd\u003e0 Hz to 12.5 MHz\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eResolution\u003c\/td\u003e\n\u003ctd\u003e0.004 Hz (with 25 MHz reference clock)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eOutput Voltage\u003c\/td\u003e\n\u003ctd\u003e0.65 Vpp typical\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eInterface\u003c\/td\u003e\n\u003ctd\u003eSPI (3-wire serial)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSupply Voltage\u003c\/td\u003e\n\u003ctd\u003e2.3V to 5.5V\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eWhat You Can Build With This\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003ePrecision function generator for electronics lab\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/kit-tone-generator-audio-test\"\u003eAudio tone generator for musical instruments\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003eRF test signal source for receiver testing\u003c\/li\u003e\n  \u003cli\u003eVariable frequency drive for motor control\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eWorks with 3.3V and 5V microcontrollers like Arduino Uno, Nano, ESP32, STM32, and Raspberry Pi Pico. The SPI interface uses standard digital pins. Many libraries available for easy frequency and waveform control. Pair with an amplifier for higher output levels.\u003c\/p\u003e\n\u003ch2\u003eWiring Notes\u003c\/h2\u003e\n\u003cp\u003eConnect VCC to 3.3V (5V may damage), GND to ground, and SPI pins SDATA, SCLK, FSYNC to microcontroller digital pins. Use 10kΩ pull-up resistors on data lines if driving long wires. Keep signal traces short to minimize noise.\u003c\/p\u003e\n\u003ch2\u003eWhy Buy from Compoden\u003c\/h2\u003e\n\u003cp\u003eEvery component is sourced from verified suppliers and tested for compatibility before listing. We've spent 10 years building projects for makers, schools, and institutions across India. Ships from Bengaluru in 3-5 days. If defective on arrival, replace within 7 days.\u003c\/p\u003e\n\u003cdetails\u003e\u003csummary\u003eIs this compatible with Arduino?\u003c\/summary\u003e\u003cp\u003eYes, the AD9833 module works with Arduino using the SPI library. There are several open-source libraries that simplify generating waveforms.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eCan I get a 0-5V output from this module?\u003c\/summary\u003e\u003cp\u003eThe module outputs around 0.65V peak-to-peak. You can use an op-amp amplifier circuit to scale the output to 0-5V or higher.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eDoes this module include a crystal oscillator?\u003c\/summary\u003e\u003cp\u003eYes, most AD9833 modules include a 25 MHz crystal oscillator for the reference clock, enabling precise frequency generation.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdiv class=\"compoden-handoff\" style=\"margin-top:24px;padding:16px;background:#f0f4ff;border-left:4px solid #2B4D8F;border-radius:4px;\"\u003e\n  \u003cp style=\"margin:0 0 6px 0;font-weight:600;color:#1A3560;\"\u003e📦 Free Setup Handoff Document Included\u003c\/p\u003e\n  \u003cp style=\"margin:0;font-size:0.95em;color:#333;\"\u003eEvery Compoden order includes a free setup handoff document — step-by-step instructions to get your component working within minutes. Download it via QR code on your package. The handoff document is also trained to help you troubleshoot the majority of problems.\u003c\/p\u003e\n\u003c\/div\u003e\n","brand":"Compoden","offers":[{"title":"Default Title","offer_id":53445081301357,"sku":"CDN-0933","price":410.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0999\/3997\/5533\/files\/ad9833-dds-signal-generator-module-1440x1440.webp?v=1781522885"},{"product_id":"lm393-dual-comparator-ic-low-power-wide-voltage-range","title":"LM393 Dual Comparator IC – Low Power, Wide Voltage Range","description":"\u003ch1\u003eLM393 Dual Comparator IC – Low Power, Wide Voltage Range\u003c\/h1\u003e\u003cp\u003eThe LM393 is a dual differential comparator designed to operate from a single or split power supply. It compares two input voltages and outputs a digital signal based on which is higher. With a wide supply voltage range, low current drain, and open-collector outputs, it's a go-to IC for signal conditioning, level detection, and voltage monitoring in embedded systems.\u003c\/p\u003e\u003ch2\u003eKey Specifications\u003c\/h2\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupply Voltage\u003c\/td\u003e\n\u003ctd\u003e2V to 36V (single) or ±1V to ±18V (dual)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Offset Voltage\u003c\/td\u003e\n\u003ctd\u003eTypically 2mV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Bias Current\u003c\/td\u003e\n\u003ctd\u003e25nA (typical)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Type\u003c\/td\u003e\n\u003ctd\u003eOpen Collector (requires pull‑up)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Comparators\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePackage\u003c\/td\u003e\n\u003ctd\u003eDIP‑8 (through‑hole)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch2\u003eWhat You Can Build With This\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eWindow comparator for battery voltage monitoring\u003c\/li\u003e\n\u003cli\u003eOvervoltage protection circuit with relay driver\u003c\/li\u003e\n\u003cli\u003eLight\/dark detection threshold switch\u003c\/li\u003e\n\u003cli\u003eZero‑crossing detector for AC signal processing\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCompatibility\u003c\/h2\u003e\u003cp\u003eThe LM393 operates over a supply range that matches common 3.3V and 5V logic levels, making it suitable for direct connection to Arduino, Raspberry Pi, or ESP32 boards. Its open‑collector outputs can sink up to 16mA, allowing direct drive of small relays or LEDs with a pull‑up resistor. It's often paired with transistor or MOSFET drivers for higher current loads.\u003c\/p\u003e\u003ch2\u003eWiring Notes\u003c\/h2\u003e\u003cp\u003eConnect Vcc (pin 8) to your positive supply and GND (pin 4) to ground. Apply input signals to the non‑inverting (pins 3,5) and inverting (pins 2,6) terminals. Outputs (pins 1,7) require a pull‑up resistor (typically 4.7kΩ to 10kΩ) to Vcc to obtain a high logic level. Keep input voltages within the common‑mode range (0V to Vcc−1.5V) for reliable operation.\u003c\/p\u003e\u003ch2\u003eWhy Buy from Compoden\u003c\/h2\u003e\u003cp\u003eEvery component is sourced from verified suppliers and tested for compatibility before listing. We've spent 10 years building projects for makers, schools, and institutions across India. Ships from Bengaluru in 3-5 days. If defective on arrival, replace within 7 days.\u003c\/p\u003e\u003cdetails\u003e\u003csummary\u003eIs this compatible with Arduino Uno?\u003c\/summary\u003e\u003cp\u003eYes, you can power the LM393 from the Arduino's 5V pin. Connect its output to any digital input; a 10kΩ pull‑up resistor to 5V is needed for proper logic levels.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eHow do I use it as a zero‑crossing detector?\u003c\/summary\u003e\u003cp\u003eSet one input to ground and the other to your AC signal through a series resistor. The output will toggle on each zero crossing; a software debounce may be required.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhat pull‑up resistor value should I choose?\u003c\/summary\u003e\u003cp\u003eA 4.7kΩ resistor is a good starting point for most applications. Lower values increase speed but draw more current; a 10kΩ value works well for low‑speed logic interfacing.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdiv class=\"compoden-handoff\" style=\"margin-top:24px;padding:16px;background:#f0f4ff;border-left:4px solid #2B4D8F;border-radius:4px;\"\u003e\n  \u003cp style=\"margin:0 0 6px 0;font-weight:600;color:#1A3560;\"\u003e📦 Free Setup Handoff Document Included\u003c\/p\u003e\n  \u003cp style=\"margin:0;font-size:0.95em;color:#333;\"\u003eEvery Compoden order includes a free setup handoff document — step-by-step instructions to get your component working within minutes. Download it via QR code on your package. The handoff document is also trained to help you troubleshoot the majority of problems.\u003c\/p\u003e\n\u003c\/div\u003e\n","brand":"Compoden","offers":[{"title":"Default Title","offer_id":53445081596269,"sku":"CDN-0940","price":35.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0999\/3997\/5533\/files\/image_1_52387cae-3ad5-4acd-aba8-fd60e2be506f.jpg?v=1781513193"},{"product_id":"gt2-timing-belt-1-meter-2mm-pitch-6mm-width","title":"GT2 Timing Belt 1 Meter – 2mm Pitch, 6mm Width","description":"\u003ch1\u003eGT2 Timing Belt 1 Meter – 2mm Pitch, 6mm Width\u003c\/h1\u003e\n\n\u003cp\u003eThe GT2 belt is a 1-meter long timing belt with a 2mm pitch and 6mm width. It is commonly used in 3D printers, CNC machines, and linear motion systems. The fiberglass reinforcement provides high strength and minimal stretching for precise movement.\u003c\/p\u003e\n\n\u003ch2\u003eKey Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBelt Type\u003c\/td\u003e\n\u003ctd\u003eGT2 Timing Belt\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e1 meter (1000mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePitch\u003c\/td\u003e\n\u003ctd\u003e2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eWidth\u003c\/td\u003e\n\u003ctd\u003e6mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eRubber with fiberglass reinforcement\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTooth Profile\u003c\/td\u003e\n\u003ctd\u003eCurvilinear (GT2)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWhat You Can Build With This\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e3D printer (e.g., Prusa i3, Ender 3 style)\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/kit-2-axis-cnc-laser-engraver\"\u003eCNC router or laser engraver\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003eCamera slider for time-lapse photography\u003c\/li\u003e\n  \u003cli\u003eAutomated curtain or blind opener\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eThis GT2 belt pairs directly with GT2 pulleys (typically 20 teeth, 5mm bore). It works with NEMA 17 stepper motors and popular controllers like Arduino Mega with RAMPS 1.4. It can be cut to desired length for custom builds.\u003c\/p\u003e\n\n\u003ch2\u003eWiring Notes\u003c\/h2\u003e\n\u003cp\u003eAs a mechanical component, no electrical wiring is needed. Ensure proper belt tension by adjusting the idler pulley. A 10-15 N tension is typical to avoid skipping without overloading motor bearings.\u003c\/p\u003e\n\n\u003ch2\u003eWhy Buy from Compoden\u003c\/h2\u003e\n\u003cp\u003eEvery component is sourced from verified suppliers and tested for compatibility before listing. We've spent 10 years building projects for makers, schools, and institutions across India. Ships from Bengaluru in 3-5 days. If defective on arrival, replace within 7 days.\u003c\/p\u003e\n\n\u003cdetails\u003e\u003csummary\u003eIs this compatible with Ender 3 3D printers?\u003c\/summary\u003e\u003cp\u003eYes, the GT2 belt is the standard for Ender 3 and similar printers. You can use it as a direct replacement for the X and Y axis belts.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eCan I cut this belt to a shorter length?\u003c\/summary\u003e\u003cp\u003eAbsolutely. Cut with sharp scissors or a knife and secure the ends with zip ties or clamps to form a loop if needed.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eDoes this belt have fiberglass reinforcement?\u003c\/summary\u003e\u003cp\u003eYes, it’s reinforced with fiberglass cords for high tensile strength and low stretch under load.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdiv class=\"compoden-handoff\" style=\"margin-top:24px;padding:16px;background:#f0f4ff;border-left:4px solid #2B4D8F;border-radius:4px;\"\u003e\n  \u003cp style=\"margin:0 0 6px 0;font-weight:600;color:#1A3560;\"\u003e📦 Free Setup Handoff Document Included\u003c\/p\u003e\n  \u003cp style=\"margin:0;font-size:0.95em;color:#333;\"\u003eEvery Compoden order includes a free setup handoff document — step-by-step instructions to get your component working within minutes. Download it via QR code on your package. The handoff document is also trained to help you troubleshoot the majority of problems.\u003c\/p\u003e\n\u003c\/div\u003e\n","brand":"Compoden","offers":[{"title":"Default Title","offer_id":53445081825645,"sku":"CDN-0939","price":120.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0999\/3997\/5533\/files\/image_1_d235ccd4-5ad5-4429-b672-111423fbaa2e.jpg?v=1781513195"},{"product_id":"velcro-anti-static-wristband-esd-safe-compoden","title":"Velcro Anti-Static Wristband ESD Safe | Compoden","description":"\u003ch1\u003eVelcro Anti-Static Wristband — Adjustable ESD Grounding Strap\u003c\/h1\u003e\u003cp\u003eThe Velcro anti-static wristband grounds your body to prevent electrostatic discharge damage when handling sensitive electronics. It features an adjustable Velcro closure for a secure fit and a built-in 1MΩ resistor for safety.\u003c\/p\u003e\u003ch2\u003eKey Specifications\u003c\/h2\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBand Material\u003c\/td\u003e\n\u003ctd\u003eConductive elastic fabric with Velcro\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResistor\u003c\/td\u003e\n\u003ctd\u003e1MΩ (1 megohm) current-limiting\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCord Length\u003c\/td\u003e\n\u003ctd\u003e1.5 m coiled (extends to ~3 m)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGround Connection\u003c\/td\u003e\n\u003ctd\u003e4 mm banana plug with alligator clip\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSizing\u003c\/td\u003e\n\u003ctd\u003eAdjustable, fits most wrists\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch2\u003eWhat You Can Build With This\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eAssemble a PC without frying the motherboard\u003c\/li\u003e\n\u003cli\u003eRepair smartphones and tablets safely\u003c\/li\u003e\n\u003cli\u003eSet up a soldering station for DIY electronics\u003c\/li\u003e\n\u003cli\u003eHandle CMOS sensors and microcontrollers in dry environments\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCompatibility\u003c\/h2\u003e\u003cp\u003eThe wristband connects to any standard ESD grounding point or mat with a 4 mm socket. Compatible with all common workbenches and anti-static setups. Use with an ESD mat for full protection.\u003c\/p\u003e\u003ch2\u003eWiring Notes\u003c\/h2\u003e\u003cp\u003eSnap the cord to the wristband and plug the banana jack into a grounded ESD mat or directly to a mains earth via an adapter. The alligator clip can attach to a bare metal ground point. The 1MΩ resistor limits current to safe levels.\u003c\/p\u003e\u003ch2\u003eWhy Buy from Compoden\u003c\/h2\u003e\u003cp\u003eEvery component is sourced from verified suppliers and tested for compatibility before listing. We've spent 10 years building projects for makers, schools, and institutions across India. Ships from Bengaluru in 3-5 days. If defective on arrival, replace within 7 days.\u003c\/p\u003e\u003cdetails\u003e\u003csummary\u003eIs this compatible with Arduino projects?\u003c\/summary\u003e\u003cp\u003eYes, wear the wristband and connect its cord to an ESD mat or ground point whenever handling Arduino boards or shields to avoid static damage.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWill it fit a large wrist?\u003c\/summary\u003e\u003cp\u003eThe adjustable Velcro strap expands to fit most adult wrists comfortably, up to approximately 25 cm circumference.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eDoes the resistor affect grounding performance?\u003c\/summary\u003e\u003cp\u003eThe 1MΩ resistor safely bleeds static charge while protecting you from electric shock; it meets industry standards for ESD protection.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdiv class=\"compoden-handoff\" style=\"margin-top:24px;padding:16px;background:#f0f4ff;border-left:4px solid #2B4D8F;border-radius:4px;\"\u003e\n  \u003cp style=\"margin:0 0 6px 0;font-weight:600;color:#1A3560;\"\u003e📦 Free Setup Handoff Document Included\u003c\/p\u003e\n  \u003cp style=\"margin:0;font-size:0.95em;color:#333;\"\u003eEvery Compoden order includes a free setup handoff document — step-by-step instructions to get your component working within minutes. Download it via QR code on your package. The handoff document is also trained to help you troubleshoot the majority of problems.\u003c\/p\u003e\n\u003c\/div\u003e\n","brand":"Compoden","offers":[{"title":"Default Title","offer_id":53445082775917,"sku":"CDN-0945","price":120.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0999\/3997\/5533\/files\/image_1_b8719637-f759-4ad1-9709-b0dc5e51e601.jpg?v=1781513201"},{"product_id":"4-channel-relay-opto-isolated-input-board-compoden","title":"4-Channel Relay \u0026 Opto-Isolated Input Board – Compoden","description":"\u003ch1\u003e4 Channel Relay \u0026amp; Opto-Isolated Input Board\u003c\/h1\u003e\n\u003cp\u003eThis board integrates four 10A SPDT relays and four independent opto-isolated digital inputs on a single PCB. It safely links low‑voltage microcontrollers to high‑power AC or DC devices while the optocouplers protect your controller from ground loops and voltage spikes. Ideal for appliance control, machine sensing, and automation projects.\u003c\/p\u003e\n\n\u003ch2\u003eKey Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRelay Channels\u003c\/td\u003e\n\u003ctd\u003e4 (each SPDT – NO, COM, NC)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRelay Coil Voltage\u003c\/td\u003e\n\u003ctd\u003e5V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMax Switching Load\u003c\/td\u003e\n\u003ctd\u003e10A @ 250VAC \/ 10A @ 30VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eOpto‑Isolated Input Channels\u003c\/td\u003e\n\u003ctd\u003e4 (on‑board LED indicators)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eInput Signal Voltage\u003c\/td\u003e\n\u003ctd\u003e3V – 24V DC (optocoupler active)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWhat You Can Build With This\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eHome appliance scheduler – turn lights, fans, or heaters on\/off from a smartphone\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/greenhouse-soil-moisture-sensor-kit-with-arduino-nano-solar-charged\"\u003eAutomated greenhouse – control water pumps and read soil‑moisture sensors simultaneously\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/esp32-garage-door-opener-kit-auto-open-and-close-via-phone-ble\"\u003eGarage door opener with limit‑switch feedback for fully automatic operation\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/kit-industrial-machine-monitor\"\u003eIndustrial status panel – monitor machine sensors (proximity, push‑buttons) and trigger alarms or relays\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eDesigned for any 3.3V or 5V controller pin – works directly with Arduino Nano, Uno,\n\u003c\/p\u003e\u003cdiv class=\"compoden-handoff\" style=\"margin-top:24px;padding:16px;background:#f0f4ff;border-left:4px solid #2B4D8F;border-radius:4px;\"\u003e\n  \u003cp style=\"margin:0 0 6px 0;font-weight:600;color:#1A3560;\"\u003e📦 Free Setup Handoff Document Included\u003c\/p\u003e\n  \u003cp style=\"margin:0;font-size:0.95em;color:#333;\"\u003eEvery Compoden order includes a free setup handoff document — step-by-step instructions to get your component working within minutes. Download it via QR code on your package. The handoff document is also trained to help you troubleshoot the majority of problems.\u003c\/p\u003e\n\u003c\/div\u003e\n","brand":"Compoden","offers":[{"title":"Default Title","offer_id":53445084152173,"sku":"CDN-0014","price":520.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0999\/3997\/5533\/files\/image_1_608a4a7c-ddda-4210-a8de-202806439396.jpg?v=1781513214"},{"product_id":"lm358-op-amp-dual-low-power-operational-amplifier-ic-compoden","title":"LM358 Op-Amp – Dual Low Power Operational Amplifier IC – Compoden","description":"\u003ch1\u003eLM358 Op-Amp\u003c\/h1\u003e\n\u003cp\u003eThe LM358 is a dual low-power operational amplifier IC featuring two independent op-amps in a single 8-pin DIP package. It is widely used for signal amplification, sensor interfacing, comparator circuits, and active filter design. With its ability to operate from a single supply as low as 3V, it's a popular choice for battery-powered and microcontroller-based projects.\u003c\/p\u003e\n\n\u003ch2\u003eKey Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003eLM358\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eNumber of Channels\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSupply Voltage (Single)\u003c\/td\u003e\n\u003ctd\u003e3V to 32V\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSupply Current per Channel\u003c\/td\u003e\n\u003ctd\u003e0.5 mA (typ.)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eInput Offset Voltage\u003c\/td\u003e\n\u003ctd\u003e2 mV (max)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePackage\u003c\/td\u003e\n\u003ctd\u003eDIP-8\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWhat You Can Build With This\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eNon-inverting amplifier for boosting weak sensor outputs\u003c\/li\u003e\n  \u003cli\u003eActive low-pass filter for smoothing noisy analog signals\u003c\/li\u003e\n  \u003cli\u003eVoltage comparator with adjustable hysteresis for threshold detection\u003c\/li\u003e\n  \u003cli\u003eAudio preamplifier stage for electret microphones\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eThe LM358 operates from standard 5V and 3.3V supplies, making it compatible with Arduino, ESP32, Raspberry Pi, and other development boards. It is often used with resistive sensor networks, potentiometers, and capacitor filters. Common pairings include the LM393 comparator or logic-level MOSFETs for driving loads.\u003c\/p\u003e\n\n\u003ch2\u003eWiring Notes\u003c\/h2\u003e\n\u003cp\u003eConnect Vcc (pin 8) to +5V and GND (pin 4) to ground. For single-supply operation, bias the non-inverting input to half the supply voltage using a resistive divider. Add a 0.1µF ceramic bypass capacitor across Vcc and GND near the IC. The output can source or sink up to 20mA, so avoid driving heavy loads directly.\u003c\/p\u003e\n\n\u003ch2\u003eWhy Buy from Compoden\u003c\/h2\u003e\n\u003cp\u003eEvery component is sourced from verified suppliers and tested for compatibility before listing. We've spent 10 years building projects for makers, schools, and institutions across India. Ships from Bengaluru in 3-5 days. If defective on arrival, replace within 7 days.\u003c\/p\u003e\n\n\u003cdetails\u003e\u003csummary\u003eIs this compatible with Arduino?\u003c\/summary\u003e\u003cp\u003eYes, LM358 works with the 5V supply from Arduino and can be used for analog signal conditioning, such as amplifying sensor outputs or creating voltage followers.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat is the supply voltage range?\u003c\/summary\u003e\u003cp\u003eIt supports a wide single supply range from 3V to 32V, or dual supplies from ±1.5V to ±16V.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eCan it drive a speaker directly?\u003c\/summary\u003e\u003cp\u003eNo, the output current is limited to 20mA. For audio output, use an additional transistor amplifier or dedicated audio amplifier IC.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdiv class=\"compoden-handoff\" style=\"margin-top:24px;padding:16px;background:#f0f4ff;border-left:4px solid #2B4D8F;border-radius:4px;\"\u003e\n  \u003cp style=\"margin:0 0 6px 0;font-weight:600;color:#1A3560;\"\u003e📦 Free Setup Handoff Document Included\u003c\/p\u003e\n  \u003cp style=\"margin:0;font-size:0.95em;color:#333;\"\u003eEvery Compoden order includes a free setup handoff document — step-by-step instructions to get your component working within minutes. Download it via QR code on your package. The handoff document is also trained to help you troubleshoot the majority of problems.\u003c\/p\u003e\n\u003c\/div\u003e\n","brand":"Compoden","offers":[{"title":"Default Title","offer_id":53445151031661,"sku":"CDN-0881","price":35.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0999\/3997\/5533\/files\/image_1_b7f46f5f-afbc-4869-b96f-bcefd25aadd1.jpg?v=1781513539"},{"product_id":"5v-single-channel-relay-module-for-arduino-raspberry-pi","title":"5V Single Channel Relay Module for Arduino \u0026 Raspberry Pi","description":"\u003ch1\u003e5V Single Channel Relay Module (5V Coil, 10A\/250VAC)\u003c\/h1\u003e\n\n\u003cp class=\"product-lede\"\u003eThis 5V single-channel relay module provides a safe and convenient way to control high-voltage AC\/DC loads up to 10A at 250VAC using any 3.3V or 5V microcontroller like Arduino, ESP32, or Raspberry Pi.\u003c\/p\u003e\n\n\u003ch2\u003eKey Specifications\u003c\/h2\u003e\n\u003ctable class=\"specs-table\"\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCoil Voltage\u003c\/td\u003e\n\u003ctd\u003e5V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTrigger Voltage\u003c\/td\u003e\n\u003ctd\u003e5V (3.3V logic compatible)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMaximum Switching Voltage (AC)\u003c\/td\u003e\n\u003ctd\u003eUp to 250V\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMaximum Switching Voltage (DC)\u003c\/td\u003e\n\u003ctd\u003eUp to 30V\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMaximum Switching Current\u003c\/td\u003e\n\u003ctd\u003e10A\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eIsolation Type\u003c\/td\u003e\n\u003ctd\u003eOptocoupler (PC817)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRelay Type\u003c\/td\u003e\n\u003ctd\u003eSPDT (Single Pole Double Throw)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWhat You Can Build With This\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/kit-automatic-plant-watering-system\"\u003e\n\u003cstrong\u003eAutomatic Plant Watering:\u003c\/strong\u003e Combine a soil moisture sensor and a relay‑controlled pump to water plants automatically with Arduino Uno.\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/kit-home-smart-light-switch-kit-with-esp32-plus-camera\"\u003e\n\u003cstrong\u003eSmart Light Control:\u003c\/strong\u003e Use an ESP32 and Blynk app to switch a table lamp remotely – a beginner IoT home automation project.\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeb‑Controlled Appliance:\u003c\/strong\u003e Build a Raspberry Pi web server that toggles a household fan or light from any browser on your network.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAutomated Streetlight Model:\u003c\/strong\u003e CBSE Class 12 physics practical – create a working LDR‑based automatic streetlight with relay switching.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIoT Energy Manager:\u003c\/strong\u003e B.Tech final‑year project – design a load scheduling system using ESP32, relay modules, and a dashboard for Smart India Hackathon.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003ctable class=\"compat-table\"\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003ePlatform\u003c\/th\u003e\n\u003cth\u003eCompatible\u003c\/th\u003e\n\u003cth\u003eConnection\u003c\/th\u003e\n\u003cth\u003eLibrary \/ Method\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eArduino Uno R3\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eVCC→5V, GND→GND, IN→D2\u003c\/td\u003e\n\u003ctd\u003edigitalWrite (built‑in)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eArduino Nano\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eVCC→5V, GND→GND, IN→D2\u003c\/td\u003e\n\u003ctd\u003edigitalWrite (built‑in)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eArduino Mega 2560\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eVCC→5V, GND→GND, IN→D2\u003c\/td\u003e\n\u003ctd\u003edigitalWrite (built‑in)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eESP8266 NodeMCU\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eVCC→Vin (5V), GND→GND, IN→D1 (GPIO5)\u003c\/td\u003e\n\u003ctd\u003edigitalWrite (Arduino IDE)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eESP32 Dev Board\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eVCC→5V pin, GND→GND, IN→GPIO23\u003c\/td\u003e\n\u003ctd\u003edigitalWrite (Arduino IDE)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRaspberry Pi Pico\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eVCC→VBUS (5V), GND→GND, IN→GP0\u003c\/td\u003e\n\u003ctd\u003eMicroPython Pin class\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRaspberry Pi 4 \/ 5\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eVCC→pin 2 (5V), GND→pin 6, IN→GPIO17 (pin 11)\u003c\/td\u003e\n\u003ctd\u003eRPi.GPIO \/ gpiozero (Python)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWiring and Interface Notes\u003c\/h2\u003e\n\u003cp\u003eStandard wiring: VCC to 5V pin, GND to ground, IN to digital GPIO. The relay typically activates on a LOW signal (active‑low) — verify with your module. Use a safety enclosure and never touch contacts when powered, especially with AC mains.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"faq\"\u003e\n  \u003cdiv class=\"faq-item\"\u003e\n    \u003ch3\u003eIs this relay module active‑high or active‑low?\u003c\/h3\u003e\n    \u003cp\u003eMost 5V single‑channel relay modules are active‑low; the relay energizes when the IN pin is pulled to GND. Check the jumper or module markings, as some can be reconfigured.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"faq-item\"\u003e\n    \u003ch3\u003eCan I use this relay with a 3.3V microcontroller like ESP32?\u003c\/h3\u003e\n    \u003cp\u003eYes, the module's optocoupler and transistor driver allow triggering with a 3.3V logic signal, provided you separately power the relay coil with 5V. All our microcontroller boards support 5V output pins.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@graph\": [\n    {\n      \"@type\": \"Product\",\n      \"@id\": \"https:\/\/compoden.in\/products\/5v-single-channel-relay-module-for-arduino-raspberry-pi#product\",\n      \"name\": \"5V Single Channel Relay Module (5V Coil, 10A\/250VAC)\",\n      \"description\": \"Buy 5V single channel relay module for ₹40 at Compoden. 10A 250VAC switching, optocoupler isolation. Ideal for Arduino, ESP32, Raspberry Pi automation.\",\n      \"sku\": \"CDN-0952\",\n      \"mpn\": \"CDN-0952\",\n      \"brand\": {\"@type\": \"Brand\", \"name\": \"Compoden\"},\n      \"offers\": {\n        \"@type\": \"Offer\",\n        \"priceCurrency\": \"INR\",\n        \"price\": \"40\",\n        \"availability\": \"https:\/\/schema.org\/InStock\",\n        \"seller\": {\"@type\": \"Organization\", \"name\": \"Compoden\", \"url\": \"https:\/\/compoden.in\"}\n      }\n    },\n    {\n      \"@type\": \"FAQPage\",\n      \"@id\": \"https:\/\/compoden.in\/products\/5v-single-channel-relay-module-for-arduino-raspberry-pi#faq\",\n      \"mainEntity\": [\n        {\"@type\": \"Question\", \"name\": \"Is this relay module active‑high or active‑low?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Most 5V single‑channel relay modules are active‑low; the relay energizes when the IN pin is pulled to GND. Check the jumper or module markings, as some can be reconfigured.\"}},\n        {\"@type\": \"Question\", \"name\": \"Can I use this relay with a 3.3V microcontroller like ESP32?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes, the module's optocoupler and transistor driver allow triggering with a 3.3V logic signal, provided you separately power the relay coil with 5V. All our microcontroller boards support 5V output pins.\"}}\n      ]\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"Compoden","offers":[{"title":"Default Title","offer_id":53454855143789,"sku":"CDN-0952","price":45.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0999\/3997\/5533\/files\/p.png?v=1782230029"},{"product_id":"sandisk-32gb-microsd-card-class-10-for-raspberry-pi-arduino","title":"SanDisk 32GB MicroSD Card Class 10 for Raspberry Pi \u0026 Arduino","description":"\u003ch1\u003eSanDisk 32GB Class 10 UHS-I MicroSD Card for Pi \u0026amp; Arduino\u003c\/h1\u003e\n\n\u003cp class=\"product-lede\"\u003eThe SanDisk 32GB Class 10 UHS-I microSD card is ideal for Raspberry Pi OS storage, Arduino data logging with SD module, ESP32 projects, and high-speed file transfers with reliable performance.\u003c\/p\u003e\n\n\u003ch2\u003eKey Specifications\u003c\/h2\u003e\n\u003ctable class=\"specs-table\"\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003cth\u003eCapacity\u003c\/th\u003e\n\u003ctd\u003e32 GB\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eSpeed Class\u003c\/th\u003e\n\u003ctd\u003eClass 10, UHS-I U1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eMax. Read Speed\u003c\/th\u003e\n\u003ctd\u003eUp to 120 MB\/s\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eMax. Write Speed\u003c\/th\u003e\n\u003ctd\u003eUp to 20 MB\/s\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eForm Factor\u003c\/th\u003e\n\u003ctd\u003emicroSDHC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eAdapter Included\u003c\/th\u003e\n\u003ctd\u003eYes (full‑size SD adapter)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eOperating Temperature\u003c\/th\u003e\n\u003ctd\u003e-25°C to 85°C\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWhat You Can Build With This\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/kit-dht11-temperature-and-humidity-starter-kit\"\u003e\n\u003cstrong\u003eTemperature Data Logger:\u003c\/strong\u003e Arduino-based logger with DHT11 sensor storing temperature and humidity readings on microSD for offline analysis.\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eESP32 Wi‑Fi Data Buffer:\u003c\/strong\u003e Use microSD as local buffer to store sensor data before syncing to cloud via ESP32’s Wi‑Fi, preventing data loss during network outages.\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/kit-pi-4-retro-gaming-console\"\u003e\n\u003cstrong\u003eRaspberry Pi Retro Gaming Console:\u003c\/strong\u003e Flash RetroPie OS onto the microSD to build a portable retro gaming system with a Raspberry Pi 4.\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/kit-soil-sensor-data-logger\"\u003e\n\u003cstrong\u003eCBSE Physics Practical – Sensor Data Logger:\u003c\/strong\u003e Interface microSD with Arduino Nano to record analog sensor data for Class 12 experiments on time‑varying signals, as per CBSE curriculum.\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSmart Agriculture IoT Hub:\u003c\/strong\u003e B.Tech project using ESP32 and microSD to log soil moisture and temperature from multiple sensors, enabling offline data collection for Smart India Hackathon.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003ctable class=\"compat-table\"\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003ePlatform\u003c\/th\u003e\n\u003cth\u003eCompatible\u003c\/th\u003e\n\u003cth\u003eConnection\u003c\/th\u003e\n\u003cth\u003eLibrary \/ Method\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eArduino Uno R3\u003c\/td\u003e\n\u003ctd\u003eYes with condition\u003c\/td\u003e\n\u003ctd\u003eRequires SD module, SPI: pins 11 (MOSI), 12 (MISO), 13 (SCK), 4 (CS)\u003c\/td\u003e\n\u003ctd\u003eSD.h\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eArduino Nano\u003c\/td\u003e\n\u003ctd\u003eYes with condition\u003c\/td\u003e\n\u003ctd\u003eRequires SD module, SPI: pins 11, 12, 13, 10 (CS)\u003c\/td\u003e\n\u003ctd\u003eSD.h\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eArduino Mega 2560\u003c\/td\u003e\n\u003ctd\u003eYes with condition\u003c\/td\u003e\n\u003ctd\u003eRequires SD module, SPI: pins 51 (MOSI), 50 (MISO), 52 (SCK), 53 (CS)\u003c\/td\u003e\n\u003ctd\u003eSD.h\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eESP8266 NodeMCU\u003c\/td\u003e\n\u003ctd\u003eYes with condition\u003c\/td\u003e\n\u003ctd\u003eSPI: D5 (CLK), D6 (MISO), D7 (MOSI), D8 (CS)\u003c\/td\u003e\n\u003ctd\u003eSD.h or SDFat\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eESP32 Dev Board\u003c\/td\u003e\n\u003ctd\u003eYes with condition\u003c\/td\u003e\n\u003ctd\u003eVSPI: GPIO 23 (MOSI), 19 (MISO), 18 (SCK), 5 (CS)\u003c\/td\u003e\n\u003ctd\u003eSD.h or SD_MMC (if using built‑in slot)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRaspberry Pi Pico\u003c\/td\u003e\n\u003ctd\u003eYes with condition\u003c\/td\u003e\n\u003ctd\u003eSPI1: GP10 (SCK), GP11 (MOSI), GP8 (MISO), GP9 (CS)\u003c\/td\u003e\n\u003ctd\u003eMicroPython sdcard library\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRaspberry Pi 4 \/ 5\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eDirect microSD slot\u003c\/td\u003e\n\u003ctd\u003eOS mounts automatically\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWiring and Interface Notes\u003c\/h2\u003e\n\u003cp\u003eConnect the microSD card to an SD card module that communicates over SPI. For 5V boards like Arduino Uno, ensure the module has level shifting or operate with 3.3V logic. Always format the card as FAT32 for maximum compatibility across all platforms.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"faq\"\u003e\n  \u003cdiv class=\"faq-item\"\u003e\n    \u003ch3\u003eDo I need to format this microSD card before using with Raspberry Pi?\u003c\/h3\u003e\n    \u003cp\u003eYes, for Raspberry Pi OS installation, use the Raspberry Pi Imager which automatically formats the card. For data logging, format as FAT32.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"faq-item\"\u003e\n    \u003ch3\u003eCan I directly plug this microSD card into an Arduino board?\u003c\/h3\u003e\n    \u003cp\u003eNo, you need an external SD card module that connects via SPI. The module breaks out the pins for easy wiring with Arduino.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@graph\": [\n    {\n      \"@type\": \"Product\",\n      \"@id\": \"https:\/\/compoden.in\/products\/sandisk-32gb-microsd-card-class-10-for-raspberry-pi-arduino#product\",\n      \"name\": \"SanDisk 32GB Class 10 UHS-I MicroSD Card for Pi \u0026 Arduino\",\n      \"description\": \"SanDisk 32GB Class 10 UHS-I MicroSD card for Raspberry Pi, Arduino data logging \u0026 OS storage. Fast read\/write reliable. Buy online at Compoden India for ₹1500.\",\n      \"sku\": \"CDN-0962\",\n      \"mpn\": \"CDN-0962\",\n      \"brand\": {\"@type\": \"Brand\", \"name\": \"Compoden\"},\n      \"offers\": {\n        \"@type\": \"Offer\",\n        \"priceCurrency\": \"INR\",\n        \"price\": \"1500\",\n        \"availability\": \"https:\/\/schema.org\/InStock\",\n        \"seller\": {\"@type\": \"Organization\", \"name\": \"Compoden\", \"url\": \"https:\/\/compoden.in\"}\n      }\n    },\n    {\n      \"@type\": \"FAQPage\",\n      \"@id\": \"https:\/\/compoden.in\/products\/sandisk-32gb-microsd-card-class-10-for-raspberry-pi-arduino#faq\",\n      \"mainEntity\": [\n        {\"@type\": \"Question\", \"name\": \"Do I need to format this microSD card before using with Raspberry Pi?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes, for Raspberry Pi OS installation, use the Raspberry Pi Imager which automatically formats the card. For data logging, format as FAT32.\"}},\n        {\"@type\": \"Question\", \"name\": \"Can I directly plug this microSD card into an Arduino board?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No, you need an external SD card module that connects via SPI. The module breaks out the pins for easy wiring with Arduino.\"}}\n      ]\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"Compoden","offers":[{"title":"Default Title","offer_id":53454857568621,"sku":"CDN-0962","price":1770.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0999\/3997\/5533\/files\/p.jpg?v=1782230073"},{"product_id":"3w-8-ohm-speaker-for-arduino-audio-projects-dfplayer-mini","title":"3W 8 Ohm Speaker for Arduino Audio Projects \u0026 DFPlayer Mini","description":"\u003ch1\u003e3W 8 Ohm Speaker for Arduino Audio \u0026amp; DFPlayer Mini\u003c\/h1\u003e\n\n\u003cp class=\"product-lede\"\u003eA compact 3-watt 8-ohm speaker designed for clear audio output in Arduino, ESP32, and Raspberry Pi projects; pairs directly with the DFPlayer Mini module for simple sound playback and voice alerts.\u003c\/p\u003e\n\n\u003ch2\u003eKey Specifications\u003c\/h2\u003e\n\u003ctable class=\"specs-table\"\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003cth\u003ePower Rating\u003c\/th\u003e\n\u003ctd\u003e3 W (nominal)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eImpedance\u003c\/th\u003e\n\u003ctd\u003e8 Ω\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eFrequency Response\u003c\/th\u003e\n\u003ctd\u003e200 Hz – 15 kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eSensitivity\u003c\/th\u003e\n\u003ctd\u003e85 dB (1W\/1m)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eCone Diameter\u003c\/th\u003e\n\u003ctd\u003e40 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eMagnet Type\u003c\/th\u003e\n\u003ctd\u003eFerrite\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eConnector\u003c\/th\u003e\n\u003ctd\u003e2-pin JST PH 2.0 (8 cm wire)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eDimensions\u003c\/th\u003e\n\u003ctd\u003e40 mm (diameter) x 5 mm (thickness)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWhat You Can Build With This\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMini Doorbell:\u003c\/strong\u003e Use an Arduino Uno with a DFPlayer Mini and button to play a custom doorbell chime through this speaker.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWiFi Voice Notifier:\u003c\/strong\u003e Connect an ESP32 to a motion sensor and trigger pre-recorded voice alerts heard on the speaker.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePortable Audio Player:\u003c\/strong\u003e Build a Raspberry Pi music player that outputs to this compact speaker for personal listening.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSound-Activated Alarm:\u003c\/strong\u003e CBSE Class 12 physics project using a microphone module, Arduino, and speaker to trigger an alarm on loud noise.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePublic Transport Audio Guide:\u003c\/strong\u003e B.Tech final year project using NFC tags to identify bus stops and announce them through the speaker for visually impaired commuters.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003ctable class=\"compat-table\"\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003ePlatform\u003c\/th\u003e\n\u003cth\u003eCompatible\u003c\/th\u003e\n\u003cth\u003eConnection\u003c\/th\u003e\n\u003cth\u003eLibrary \/ Method\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eArduino Uno R3\u003c\/td\u003e\n\u003ctd\u003eYes with DFPlayer Mini\u003c\/td\u003e\n\u003ctd\u003eD10 (TX), D11 (RX) SoftwareSerial\u003c\/td\u003e\n\u003ctd\u003eDFRobotDFPlayerMini\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eArduino Nano\u003c\/td\u003e\n\u003ctd\u003eYes with DFPlayer Mini\u003c\/td\u003e\n\u003ctd\u003eD10 (TX), D11 (RX) SoftwareSerial\u003c\/td\u003e\n\u003ctd\u003eDFRobotDFPlayerMini\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eArduino Mega 2560\u003c\/td\u003e\n\u003ctd\u003eYes with DFPlayer Mini\u003c\/td\u003e\n\u003ctd\u003eSerial1 (D18 TX, D19 RX) or D10,D11\u003c\/td\u003e\n\u003ctd\u003eDFRobotDFPlayerMini\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eESP8266 NodeMCU\u003c\/td\u003e\n\u003ctd\u003eYes with DFPlayer Mini\u003c\/td\u003e\n\u003ctd\u003eGPIO2 (TX), GPIO15 (RX) SoftwareSerial\u003c\/td\u003e\n\u003ctd\u003eDFRobotDFPlayerMini\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eESP32 Dev Board\u003c\/td\u003e\n\u003ctd\u003eYes with DFPlayer Mini\u003c\/td\u003e\n\u003ctd\u003eGPIO17 (TX2), GPIO16 (RX2) or any SoftwareSerial pins\u003c\/td\u003e\n\u003ctd\u003eDFRobotDFPlayerMini\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRaspberry Pi Pico\u003c\/td\u003e\n\u003ctd\u003eYes with DFPlayer Mini\u003c\/td\u003e\n\u003ctd\u003eGP0 (TX), GP1 (RX) UART\u003c\/td\u003e\n\u003ctd\u003eDFRobotDFPlayerMini (Arduino core)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRaspberry Pi 4 \/ 5\u003c\/td\u003e\n\u003ctd\u003eYes with DFPlayer Mini\u003c\/td\u003e\n\u003ctd\u003eGPIO14 (TX), GPIO15 (RX) \/dev\/serial0\u003c\/td\u003e\n\u003ctd\u003ePython serial + DFPlayer protocol\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWiring and Interface Notes\u003c\/h2\u003e\n\u003cp\u003eConnect the speaker’s + and – terminals to the SPK_1 and SPK_2 outputs of the DFPlayer Mini module. The speaker operates at amplifier-level signals; never connect it directly to a 3.3V or 5V GPIO pin. For best sound, mount the speaker in a small enclosure to improve bass and volume.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"faq\"\u003e\n  \u003cdiv class=\"faq-item\"\u003e\n    \u003ch3\u003eCan I connect this speaker directly to Arduino without an amplifier?\u003c\/h3\u003e\n    \u003cp\u003eNo, Arduino GPIO pins cannot drive a passive speaker. You must use an amplifier like the DFPlayer Mini or a transistor circuit to power the speaker.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"faq-item\"\u003e\n    \u003ch3\u003eHow loud is this 3W speaker for a typical classroom or desk setup?\u003c\/h3\u003e\n    \u003cp\u003eThe 3W output provides clear audio for personal use or a quiet classroom; for noisy areas, a higher‑wattage speaker or additional amplification is recommended.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@graph\": [\n    {\n      \"@type\": \"Product\",\n      \"@id\": \"https:\/\/compoden.in\/products\/3w-8-ohm-speaker-for-arduino-audio-projects-dfplayer-mini#product\",\n      \"name\": \"3W 8 Ohm Speaker for Arduino Audio \u0026 DFPlayer Mini\",\n      \"description\": \"Compact 3W 8 Ohm speaker for Arduino, ESP32, Raspberry Pi audio projects. Works with DFPlayer Mini module. Clear sound for makers \u0026 STEM projects in India.\",\n      \"sku\": \"CDN-0963\",\n      \"mpn\": \"CDN-0963\",\n      \"brand\": {\"@type\": \"Brand\", \"name\": \"Compoden\"},\n      \"offers\": {\n        \"@type\": \"Offer\",\n        \"priceCurrency\": \"INR\",\n        \"price\": \"PRICE_PLACEHOLDER\",\n        \"availability\": \"https:\/\/schema.org\/InStock\",\n        \"seller\": {\"@type\": \"Organization\", \"name\": \"Compoden\", \"url\": \"https:\/\/compoden.in\"}\n      }\n    },\n    {\n      \"@type\": \"FAQPage\",\n      \"@id\": \"https:\/\/compoden.in\/products\/3w-8-ohm-speaker-for-arduino-audio-projects-dfplayer-mini#faq\",\n      \"mainEntity\": [\n        {\"@type\": \"Question\", \"name\": \"Can I connect this speaker directly to Arduino without an amplifier?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No, Arduino GPIO pins cannot drive a passive speaker. You must use an amplifier like the DFPlayer Mini or a transistor circuit to power the speaker.\"}},\n        {\"@type\": \"Question\", \"name\": \"How loud is this 3W speaker for a typical classroom or desk setup?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The 3W output provides clear audio for personal use or a quiet classroom; for noisy areas, a higher‑wattage speaker or additional amplification is recommended.\"}}\n      ]\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"Compoden","offers":[{"title":"Default Title","offer_id":53454857634157,"sku":"CDN-0963","price":300.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0999\/3997\/5533\/files\/p_ee9458ff-d614-4735-badb-b28aebb7ebad.jpg?v=1782232967"},{"product_id":"diy-robotic-arm-mechanic-kit-4dof-acrylic-robot-arm-for-students","title":"DIY Robotic Arm Mechanic Kit 4DOF – Acrylic Robot Arm for Students","description":"\u003ch1\u003eDIY Robotic Arm Mechanic Kit 4DOF – Acrylic Robot Arm for Students\u003c\/h1\u003e\n\n\u003cp class=\"product-lede\"\u003eThis DIY 4DOF acrylic robotic arm mechanic kit provides a laser-cut acrylic structure for building a functional robotic arm, compatible with Arduino, ESP32, and Raspberry Pi for student projects and maker learning.\u003c\/p\u003e\n\n\u003ch2\u003eKey Specifications\u003c\/h2\u003e\n\u003ctable class=\"specs-table\"\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eAcrylic (laser-cut)\u003c\/td\u003e\n\u003ctd\u003eHigh\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eDegrees of Freedom\u003c\/td\u003e\n\u003ctd\u003e4 (base, shoulder, elbow, gripper)\u003c\/td\u003e\n\u003ctd\u003eHigh\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eGripper Type\u003c\/td\u003e\n\u003ctd\u003eMechanical claw, included\u003c\/td\u003e\n\u003ctd\u003eHigh\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eServo Requirement\u003c\/td\u003e\n\u003ctd\u003e4x standard servos (e.g., MG996R) – not included\u003c\/td\u003e\n\u003ctd\u003eMedium\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eAssembled Weight\u003c\/td\u003e\n\u003ctd\u003e~350 g (without servos)\u003c\/td\u003e\n\u003ctd\u003eLow\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eAssembled Dimensions\u003c\/td\u003e\n\u003ctd\u003eApprox. 25 cm × 15 cm × 40 cm\u003c\/td\u003e\n\u003ctd\u003eLow\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eAssembly\u003c\/td\u003e\n\u003ctd\u003eScrewdriver required; nuts \u0026amp; bolts included\u003c\/td\u003e\n\u003ctd\u003eHigh\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eControl Compatibility\u003c\/td\u003e\n\u003ctd\u003e5V PWM signals via Arduino, ESP32, Raspberry Pi\u003c\/td\u003e\n\u003ctd\u003eHigh\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWhat You Can Build With This\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePick-and-Place Station:\u003c\/strong\u003e Arduino Uno drives four servos to move small objects from one tray to another using the Servo library.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIoT-Controlled Arm:\u003c\/strong\u003e ESP32 hosts a web server that lets you control the arm remotely via Wi‑Fi from a phone or browser.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eObject Sorter:\u003c\/strong\u003e Raspberry Pi with camera runs OpenCV to detect colours and positions the arm to sort items by colour.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCBSE Class 12 Practical:\u003c\/strong\u003e Demonstrates kinematics and torque using robotic arm motion, ideal for physics investigatory projects or ATL Tinkering Labs.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSmart India Hackathon Prototype:\u003c\/strong\u003e Build an AI‑powered waste segregation arm that picks and places items based on material recognition.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003ctable class=\"compat-table\"\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003ePlatform\u003c\/th\u003e\n\u003cth\u003eCompatible\u003c\/th\u003e\n\u003cth\u003eConnection\u003c\/th\u003e\n\u003cth\u003eLibrary \/ Method\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eArduino Uno R3\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eDigital pins 9,10,11,5 (PWM)\u003c\/td\u003e\n\u003ctd\u003eServo\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eArduino Nano\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eD3,D5,D6,D9 (PWM)\u003c\/td\u003e\n\u003ctd\u003eServo\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eArduino Mega 2560\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003ePWM pins 2-13\u003c\/td\u003e\n\u003ctd\u003eServo\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eESP8266 NodeMCU\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eGPIOs with PWM (D0-D8)\u003c\/td\u003e\n\u003ctd\u003eServo (or analogWrite)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eESP32 Dev Board\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eAny GPIO (use 4 channels)\u003c\/td\u003e\n\u003ctd\u003eESP32Servo\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRaspberry Pi Pico\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eGP0-GP3 (PWM)\u003c\/td\u003e\n\u003ctd\u003eServo or Pico-SDK PWM\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRaspberry Pi 4 \/ 5\u003c\/td\u003e\n\u003ctd\u003eYes with condition\u003c\/td\u003e\n\u003ctd\u003eGPIO + external 5V power\u003c\/td\u003e\n\u003ctd\u003epigpio (for stable PWM)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWiring and Interface Notes\u003c\/h2\u003e\n\u003cp\u003eConnect each servo’s signal wire to a PWM‑capable pin on your board and power all servos from an external 5V 2A supply; never draw servo current from the board’s 5V pin. Ensure a common ground between the microcontroller and the external power source to avoid erratic behaviour. For Raspberry Pi, we strongly recommend a PCA9685 servo driver board connected via I2C if you need jitter‑free control, or use the pigpio library.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"faq\"\u003e\n  \u003cdiv class=\"faq-item\"\u003e\n    \u003ch3\u003eAre the servo motors included in the kit?\u003c\/h3\u003e\n    \u003cp\u003eNo, this kit contains only the mechanical acrylic parts, screws, and nuts. You must purchase four standard servos (MG996R or SG90) separately.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"faq-item\"\u003e\n    \u003ch3\u003eHow much weight can the arm lift?\u003c\/h3\u003e\n    \u003cp\u003eWith typical hobby servos, the arm can lift 100–150 g. For heavier payloads, upgrade to high‑torque metal‑gear servos and reinforce the base.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@graph\": [\n    {\n      \"@type\": \"Product\",\n      \"@id\": \"https:\/\/compoden.in\/products\/diy-robotic-arm-mechanic-kit-4dof-acrylic-robot-arm-for-students#product\",\n      \"name\": \"DIY Robotic Arm Mechanic Kit 4DOF – Acrylic Robot Arm for Students\",\n      \"description\": \"DIY 4DOF acrylic robot arm kit for Arduino, ESP32, Raspberry Pi. Student-friendly, laser-cut parts. Learn robotics. Rs3039. In stock at Compoden Bengaluru.\",\n      \"sku\": \"CDN-0972\",\n      \"mpn\": \"CDN-0972\",\n      \"brand\": {\"@type\": \"Brand\", \"name\": \"Compoden\"},\n      \"offers\": {\n        \"@type\": \"Offer\",\n        \"priceCurrency\": \"INR\",\n        \"price\": \"PRICE_PLACEHOLDER\",\n        \"availability\": \"https:\/\/schema.org\/InStock\",\n        \"seller\": {\"@type\": \"Organization\", \"name\": \"Compoden\", \"url\": \"https:\/\/compoden.in\"}\n      }\n    },\n    {\n      \"@type\": \"FAQPage\",\n      \"@id\": \"https:\/\/compoden.in\/products\/diy-robotic-arm-mechanic-kit-4dof-acrylic-robot-arm-for-students#faq\",\n      \"mainEntity\": [\n        {\"@type\": \"Question\", \"name\": \"Are the servo motors included in the kit?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No, this kit contains only the mechanical acrylic parts, screws, and nuts. You must purchase four standard servos (MG996R or SG90) separately.\"}},\n        {\"@type\": \"Question\", \"name\": \"How much weight can the arm lift?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"With typical hobby servos, the arm can lift 100–150 g. For heavier payloads, upgrade to high‑torque metal‑gear servos and reinforce the base.\"}}\n      ]\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"Compoden","offers":[{"title":"Default Title","offer_id":53454858223981,"sku":"CDN-0972","price":3590.0,"currency_code":"INR","in_stock":true}]},{"product_id":"4x4-matrix-keypad-16-key-membrane-keypad-for-arduino-esp32","title":"4x4 Matrix Keypad – 16 Key Membrane Keypad for Arduino \u0026 ESP32","description":"\u003ch1\u003e4x4 Matrix Keypad – 16 Key Membrane for Arduino \u0026amp; ESP32\u003c\/h1\u003e\n\n\u003cp class=\"product-lede\"\u003eThis 4x4 matrix membrane keypad provides 16 tactile buttons in a compact, flexible layout ideal for numeric input, password systems, and menu navigation in Arduino, ESP32, and Raspberry Pi projects.\u003c\/p\u003e\n\n\u003ch2\u003eKey Specifications\u003c\/h2\u003e\n\u003ctable class=\"specs-table\"\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003cth\u003eKey Count\u003c\/th\u003e\n\u003ctd\u003e16\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eMatrix Layout\u003c\/th\u003e\n\u003ctd\u003e4 Rows × 4 Columns\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eSwitch Type\u003c\/th\u003e\n\u003ctd\u003eMembrane (conductive rubber)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eContact Rating\u003c\/th\u003e\n\u003ctd\u003e12V DC, 20mA\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eConnector\u003c\/th\u003e\n\u003ctd\u003e8-pin 2.54mm female header\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eCable Length\u003c\/th\u003e\n\u003ctd\u003e~85 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eDimensions\u003c\/th\u003e\n\u003ctd\u003e69 mm × 77 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWhat You Can Build With This\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/kit-smart-door-lock-servo-kit-with-esp32-plus-camera\"\u003e\n\u003cstrong\u003eDigital Door Lock:\u003c\/strong\u003e Create a simple password‑protected lock using a servo motor and the Keypad library on Arduino Uno.\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWi‑Fi Smart Lock:\u003c\/strong\u003e Build an IoT entry system with ESP32 that sends OTPs to a phone or logs access to the cloud.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRetro Game Console Controller:\u003c\/strong\u003e Use a Raspberry Pi to map keypad buttons as game controls for retro emulators like RetroPie.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePassword Security System:\u003c\/strong\u003e A CBSE Class 12 practical project demonstrating matrix scanning and digital I\/O with status LEDs and a buzzer.\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/kit-multi-layer-authentication-keypad-v23\"\u003e\n\u003cstrong\u003eMulti‑factor Authentication System:\u003c\/strong\u003e Combine the keypad with RFID and a database on Raspberry Pi for a college Smart India Hackathon project.\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003ctable class=\"compat-table\"\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003ePlatform\u003c\/th\u003e\n\u003cth\u003eCompatible\u003c\/th\u003e\n\u003cth\u003eConnection\u003c\/th\u003e\n\u003cth\u003eLibrary \/ Method\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eArduino Uno R3\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003e8 digital pins (4 rows, 4 cols)\u003c\/td\u003e\n\u003ctd\u003eKeypad.h\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eArduino Nano\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003e8 digital pins\u003c\/td\u003e\n\u003ctd\u003eKeypad.h\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eArduino Mega 2560\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003e8 digital pins\u003c\/td\u003e\n\u003ctd\u003eKeypad.h\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eESP8266 NodeMCU\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003e8 GPIO pins\u003c\/td\u003e\n\u003ctd\u003eKeypad library (Arduino ESP8266)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eESP32 Dev Board\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003e8 GPIO pins\u003c\/td\u003e\n\u003ctd\u003eKeypad library (Arduino ESP32)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRaspberry Pi Pico\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003e8 GPIO pins\u003c\/td\u003e\n\u003ctd\u003eMicroPython or pico‑keypad library\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRaspberry Pi 4 \/ 5\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003e8 GPIO pins (pull‑ups in software)\u003c\/td\u003e\n\u003ctd\u003eRPi.GPIO or pad4pi\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWiring and Interface Notes\u003c\/h2\u003e\n\u003cp\u003eConnect the 8‑pin female header directly to any 8 digital GPIOs on your microcontroller; the internal pull‑up resistors of the MCU are sufficient. The Keypad library for Arduino or the pad4pi module for Raspberry Pi handles matrix scanning automatically—no external components needed. Since the keypad is a passive switch matrix, voltage levels are not an issue, but ensure your GPIOs are configured as inputs with pull‑ups to avoid floating lines.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"faq\"\u003e\n  \u003cdiv class=\"faq-item\"\u003e\n    \u003ch3\u003eDo I need any resistors or external pull‑ups to use this keypad?\u003c\/h3\u003e\n    \u003cp\u003eNo external resistors are required. The standard Keypad library for Arduino and similar platforms uses the microcontroller’s built‑in pull‑up resistors on the input pins, so wiring is plug‑and‑play.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"faq-item\"\u003e\n    \u003ch3\u003eCan the keypad be used outdoors or in a wet environment?\u003c\/h3\u003e\n    \u003cp\u003eThe membrane surface offers some moisture resistance but is not fully waterproof. For outdoor projects, house the keypad in an appropriate enclosure to protect the connector and backside from humidity.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@graph\": [\n    {\n      \"@type\": \"Product\",\n      \"@id\": \"https:\/\/compoden.in\/products\/4x4-matrix-keypad-16-key-membrane-keypad-for-arduino-esp32#product\",\n      \"name\": \"4x4 Matrix Keypad – 16 Key Membrane for Arduino \u0026 ESP32\",\n      \"description\": \"Buy 4x4 Matrix Membrane Keypad with 16 keys online at Compoden India. Works with Arduino, ESP32, Raspberry Pi. Lowest price ₹60. Fast shipping from Bengaluru.\",\n      \"sku\": \"CDN-0984\",\n      \"mpn\": \"CDN-0984\",\n      \"brand\": {\"@type\": \"Brand\", \"name\": \"Compoden\"},\n      \"offers\": {\n        \"@type\": \"Offer\",\n        \"priceCurrency\": \"INR\",\n        \"price\": \"PRICE_PLACEHOLDER\",\n        \"availability\": \"https:\/\/schema.org\/InStock\",\n        \"seller\": {\"@type\": \"Organization\", \"name\": \"Compoden\", \"url\": \"https:\/\/compoden.in\"}\n      }\n    },\n    {\n      \"@type\": \"FAQPage\",\n      \"@id\": \"https:\/\/compoden.in\/products\/4x4-matrix-keypad-16-key-membrane-keypad-for-arduino-esp32#faq\",\n      \"mainEntity\": [\n        {\"@type\": \"Question\", \"name\": \"Do I need any resistors or external pull‑ups to use this keypad?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No external resistors are required. The standard Keypad library for Arduino and similar platforms uses the microcontroller’s built‑in pull‑up resistors on the input pins, so wiring is plug‑and‑play.\"}},\n        {\"@type\": \"Question\", \"name\": \"Can the keypad be used outdoors or in a wet environment?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The membrane surface offers some moisture resistance but is not fully waterproof. For outdoor projects, house the keypad in an appropriate enclosure to protect the connector and backside from humidity.\"}}\n      ]\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"Compoden","offers":[{"title":"Default Title","offer_id":53454858781037,"sku":"CDN-0984","price":70.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0999\/3997\/5533\/files\/p_029bf3a1-9ea6-45df-9b5d-9dba43bafb00.jpg?v=1782232067"},{"product_id":"usb-c-hub-4-port-usb-30-hub-for-raspberry-pi-laptop","title":"USB-C Hub – 4-Port USB 3.0 Hub for Raspberry Pi \u0026 Laptop","description":"\u003ch1\u003eUSB-C 4-Port USB 3.0 5Gbps Hub for Raspberry Pi \u0026amp; Laptop\u003c\/h1\u003e\n\n\u003cp class=\"product-lede\"\u003eExpand your Raspberry Pi or laptop’s connectivity with this compact USB-C to 4-port USB 3.0 hub, delivering SuperSpeed 5Gbps data transfer for multiple peripherals, sensors, and storage devices.\u003c\/p\u003e\n\n\u003ch2\u003eKey Specifications\u003c\/h2\u003e\n\u003ctable class=\"specs-table\"\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eInput Connector\u003c\/td\u003e\n\u003ctd\u003eUSB Type-C male (fixed cable, 15 cm)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eOutput Ports\u003c\/td\u003e\n\u003ctd\u003e4 × USB 3.0 Type-A female\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eData Transfer Rate\u003c\/td\u003e\n\u003ctd\u003eUp to 5 Gbps (SuperSpeed USB 3.0)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eUSB Standards\u003c\/td\u003e\n\u003ctd\u003eUSB 3.0 \/ backward compatible with USB 2.0 \u0026amp; 1.1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePower Source\u003c\/td\u003e\n\u003ctd\u003eBus-powered (5 V, 900 mA); optional micro‑USB power input for high‑power devices\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eChipset\u003c\/td\u003e\n\u003ctd\u003eRTS5411E (or equivalent USB 3.0 hub controller)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eapprox. 90 mm × 30 mm × 10 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWhat You Can Build With This\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/10-sensor-environmental-data-logger-kit-for-arduino-mega\"\u003e\n\u003cstrong\u003eMulti‑sensor data logger:\u003c\/strong\u003e Connect several USB temperature\/humidity dongles to an Arduino host with a USB host shield for robust environmental monitoring.\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/kit-pi-4-node-red-dashboard-sensor-hub\"\u003e\n\u003cstrong\u003eESP32 IoT dashboard:\u003c\/strong\u003e Use a USB‑to‑serial bridge per sensor, all attached via the hub, to stream real‑time air quality data to Blynk or Node‑RED.\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePersonal cloud \/ NAS:\u003c\/strong\u003e Attach up to four USB flash drives or external SSDs to a Raspberry Pi to create a compact, low‑power networked storage system.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCBSE Class 12 Physics lab:\u003c\/strong\u003e Collect data from multiple USB‑connected instruments (e.g., light gates, thermocouple amplifiers) for experiment automation.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSmart India Hackathon prototype:\u003c\/strong\u003e Centralize USB‑controlled relays, cameras, and sensors in a smart‑home gateway controlled by a Raspberry Pi or Linux laptop.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003ctable class=\"compat-table\"\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003ePlatform\u003c\/th\u003e\n\u003cth\u003eCompatible\u003c\/th\u003e\n\u003cth\u003eConnection\u003c\/th\u003e\n\u003cth\u003eLibrary \/ Method\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eArduino Uno R3\u003c\/td\u003e\n\u003ctd\u003eNo (no USB host)\u003c\/td\u003e\n\u003ctd\u003e–\u003c\/td\u003e\n\u003ctd\u003e–\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eArduino Nano\u003c\/td\u003e\n\u003ctd\u003eNo (no USB host)\u003c\/td\u003e\n\u003ctd\u003e–\u003c\/td\u003e\n\u003ctd\u003e–\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eArduino Mega 2560\u003c\/td\u003e\n\u003ctd\u003eNo (no USB host)\u003c\/td\u003e\n\u003ctd\u003e–\u003c\/td\u003e\n\u003ctd\u003e–\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eESP8266 NodeMCU\u003c\/td\u003e\n\u003ctd\u003eNo (no USB host)\u003c\/td\u003e\n\u003ctd\u003e–\u003c\/td\u003e\n\u003ctd\u003e–\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eESP32 Dev Board\u003c\/td\u003e\n\u003ctd\u003eNo (standard boards lack USB host)\u003c\/td\u003e\n\u003ctd\u003e–\u003c\/td\u003e\n\u003ctd\u003e–\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRaspberry Pi Pico\u003c\/td\u003e\n\u003ctd\u003eNo (host mode not typical on stock Pico)\u003c\/td\u003e\n\u003ctd\u003e–\u003c\/td\u003e\n\u003ctd\u003e–\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRaspberry Pi 4 \/ 5\u003c\/td\u003e\n\u003ctd\u003eYes, with adapter\u003c\/td\u003e\n\u003ctd\u003eUSB‑A to USB‑C adapter → USB 3.0 port\u003c\/td\u003e\n\u003ctd\u003eStandard Linux USB hub driver (no extra library)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWiring and Interface Notes\u003c\/h2\u003e\n\u003cp\u003eSimply plug the hub’s USB‑C connector into any USB‑C host; for devices with only USB‑A ports, use a quality USB‑A to USB‑C adapter. The hub draws up to 900 mA from the host bus – when powering multiple high‑drain accessories, connect a 5 V supply to the optional power port. With a Raspberry Pi, verify your Pi power supply can deliver at least 3 A to avoid undervoltage warnings during heavy USB usage.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"faq\"\u003e\n  \u003cdiv class=\"faq-item\"\u003e\n    \u003ch3\u003eDoes this hub support USB‑C Power Delivery (PD) pass‑through for charging?\u003c\/h3\u003e\n    \u003cp\u003eNo, this is a data‑only hub. It does not pass through USB‑PD charging. For high‑power devices, you must use the dedicated micro‑USB power input (if present).\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"faq-item\"\u003e\n    \u003ch3\u003eCan I use all four ports simultaneously at full 5 Gbps with a Raspberry Pi 4?\u003c\/h3\u003e\n    \u003cp\u003eThe Pi 4’s single USB 3.0 root hub supplies one 5 Gbps lane shared among all downstream devices. Simultaneous high‑bandwidth transfers will divide the available bandwidth.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@graph\": [\n    {\n      \"@type\": \"Product\",\n      \"@id\": \"https:\/\/compoden.in\/products\/usb-c-hub-4-port-usb-30-hub-for-raspberry-pi-laptop#product\",\n      \"name\": \"USB-C 4-Port USB 3.0 5Gbps Hub for Raspberry Pi \u0026 Laptop\",\n      \"description\": \"USB-C 4-port USB 3.0 hub with 5Gbps speed for Raspberry Pi 4\/5, laptops, Arduino, ESP32. Bus-powered or external power. Expand ports. Order from Compoden India.\",\n      \"sku\": \"CDN-0985\",\n      \"mpn\": \"CDN-0985\",\n      \"brand\": {\"@type\": \"Brand\", \"name\": \"Compoden\"},\n      \"offers\": {\n        \"@type\": \"Offer\",\n        \"priceCurrency\": \"INR\",\n        \"price\": \"PRICE_PLACEHOLDER\",\n        \"availability\": \"https:\/\/schema.org\/InStock\",\n        \"seller\": {\"@type\": \"Organization\", \"name\": \"Compoden\", \"url\": \"https:\/\/compoden.in\"}\n      }\n    },\n    {\n      \"@type\": \"FAQPage\",\n      \"@id\": \"https:\/\/compoden.in\/products\/usb-c-hub-4-port-usb-30-hub-for-raspberry-pi-laptop#faq\",\n      \"mainEntity\": [\n        {\n          \"@type\": \"Question\",\n          \"name\": \"Does this hub support USB‑C Power Delivery (PD) pass‑through for charging?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"No, this is a data‑only hub. It does not pass through USB‑PD charging. For high‑power devices, you must use the dedicated micro‑USB power input (if present).\"\n          }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"Can I use all four ports simultaneously at full 5 Gbps with a Raspberry Pi 4?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"The Pi 4’s single USB 3.0 root hub supplies one 5 Gbps lane shared among all downstream devices. Simultaneous high‑bandwidth transfers will divide the available bandwidth.\"\n          }\n        }\n      ]\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"Compoden","offers":[{"title":"Default Title","offer_id":53454858813805,"sku":"CDN-0985","price":300.0,"currency_code":"INR","in_stock":true}]},{"product_id":"velcro-wristband-adjustable-strap-for-wearable-electronics","title":"Velcro Wristband – Adjustable Strap for Wearable Electronics","description":"\u003ch1\u003eAdjustable Velcro Wristband for Wearable Electronics\u003c\/h1\u003e\n\n\u003cp class=\"product-lede\"\u003eThis adjustable nylon Velcro wristband secures Arduino, ESP32, and Raspberry Pi components for wearable electronics projects, offering a comfortable fit from 15 cm to 25 cm wrist circumferences.\u003c\/p\u003e\n\n\u003ch2\u003eKey Specifications\u003c\/h2\u003e\n\u003ctable class=\"specs-table\"\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eNylon hook-and-loop\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e28 cm (total strap length)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eWidth\u003c\/td\u003e\n\u003ctd\u003e2.5 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eAdjustable Range\u003c\/td\u003e\n\u003ctd\u003e15 cm – 25 cm (wrist circumference)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eClosure Type\u003c\/td\u003e\n\u003ctd\u003eVelcro (reusable press-to-close)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eColor\u003c\/td\u003e\n\u003ctd\u003eBlack\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e12 g\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eUniversal (any electronics module)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWhat You Can Build With This\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/kit-nano-wristband-step-counter\"\u003e\n\u003cstrong\u003eDIY Step Counter:\u003c\/strong\u003e Attach an Arduino Nano and accelerometer to the strap and count steps with simple code.\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/wifi-weather-station-with-esp8266-oled-display-kit\"\u003e\n\u003cstrong\u003eWiFi Smart Wristband:\u003c\/strong\u003e Mount ESP32 and a small OLED display to send phone notifications to your wrist.\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRaspberry Pi Wearable Camera:\u003c\/strong\u003e Secure a Pi Zero and camera module for time-lapse photography on the go.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCBSE Class 12 Physics Practical:\u003c\/strong\u003e Build a pulse sensor wristband with Arduino to demonstrate bio‑signal monitoring.\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/arduino-smart-cane-obstacle-detection-and-haptic-feedback-kit\"\u003e\n\u003cstrong\u003eSmart India Hackathon Assistive Band:\u003c\/strong\u003e Prototype a fall‑detection or haptic feedback band for hearing‑impaired users.\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003ctable class=\"compat-table\"\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003ePlatform\u003c\/th\u003e\n\u003cth\u003eCompatible\u003c\/th\u003e\n\u003cth\u003eConnection\u003c\/th\u003e\n\u003cth\u003eLibrary \/ Method\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eArduino Uno R3\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eN\/A (strap)\u003c\/td\u003e\n\u003ctd\u003ePhysical mounting\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eArduino Nano\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eN\/A (strap)\u003c\/td\u003e\n\u003ctd\u003ePhysical mounting\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eArduino Mega 2560\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eN\/A (strap)\u003c\/td\u003e\n\u003ctd\u003ePhysical mounting\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eESP8266 NodeMCU\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eN\/A (strap)\u003c\/td\u003e\n\u003ctd\u003ePhysical mounting\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eESP32 Dev Board\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eN\/A (strap)\u003c\/td\u003e\n\u003ctd\u003ePhysical mounting\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRaspberry Pi Pico\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eN\/A (strap)\u003c\/td\u003e\n\u003ctd\u003ePhysical mounting\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRaspberry Pi 4 \/ 5\u003c\/td\u003e\n\u003ctd\u003eYes (with case)\u003c\/td\u003e\n\u003ctd\u003eN\/A (strap)\u003c\/td\u003e\n\u003ctd\u003eMount in enclosure\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWiring and Interface Notes\u003c\/h2\u003e\n\u003cp\u003eThe Velcro wristband requires no wiring; simply wrap it around your wrist or project enclosure. Ensure the strap width matches your module’s mounting slots or use adhesive pads to attach components. For a firm hold during movement, press the Velcro closure fully and avoid overhandling the hook side.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"faq\"\u003e\n  \u003cdiv class=\"faq-item\"\u003e\n    \u003ch3\u003eCan this strap hold batteries or sensor modules securely?\u003c\/h3\u003e\n    \u003cp\u003eYes, the adjustable Velcro can secure small battery packs, sensor boards, and microcontrollers like Arduino Nano. It grips well when wrapped snugly.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"faq-item\"\u003e\n    \u003ch3\u003eIs the strap washable and durable enough for daily wear?\u003c\/h3\u003e\n    \u003cp\u003eThe nylon material is hand-washable and holds up to regular use, but avoid pulling it apart with excessive force to maintain hook‑and‑loop integrity.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@graph\": [\n    {\n      \"@type\": \"Product\",\n      \"@id\": \"https:\/\/compoden.in\/products\/velcro-wristband-adjustable-strap-for-wearable-electronics#product\",\n      \"name\": \"Adjustable Velcro Wristband for Wearable Electronics\",\n      \"description\": \"Buy adjustable Velcro wristband for wearable electronics projects. Ideal strap for Arduino, ESP32, Raspberry Pi wearables. ₹150 in India from Compoden.\",\n      \"sku\": \"CDN-0986\",\n      \"mpn\": \"CDN-0986\",\n      \"brand\": {\"@type\": \"Brand\", \"name\": \"Compoden\"},\n      \"offers\": {\n        \"@type\": \"Offer\",\n        \"priceCurrency\": \"INR\",\n        \"price\": \"PRICE_PLACEHOLDER\",\n        \"availability\": \"https:\/\/schema.org\/InStock\",\n        \"seller\": {\"@type\": \"Organization\", \"name\": \"Compoden\", \"url\": \"https:\/\/compoden.in\"}\n      }\n    },\n    {\n      \"@type\": \"FAQPage\",\n      \"@id\": \"https:\/\/compoden.in\/products\/velcro-wristband-adjustable-strap-for-wearable-electronics#faq\",\n      \"mainEntity\": [\n        {\"@type\": \"Question\", \"name\": \"Can this strap hold batteries or sensor modules securely?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes, the adjustable Velcro can secure small battery packs, sensor boards, and microcontrollers like Arduino Nano. It grips well when wrapped snugly.\"}},\n        {\"@type\": \"Question\", \"name\": \"Is the strap washable and durable enough for daily wear?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The nylon material is hand-washable and holds up to regular use, but avoid pulling it apart with excessive force to maintain hook‑and‑loop integrity.\"}}\n      ]\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"Compoden","offers":[{"title":"Default Title","offer_id":53454858846573,"sku":"CDN-0986","price":180.0,"currency_code":"INR","in_stock":true}]},{"product_id":"electrode-patch-adhesive-ecg-electrode-for-biomedical-projects","title":"Electrode Patch – Adhesive ECG Electrode for Biomedical Projects","description":"\u003ch1\u003eECG Electrode Patch – Ag\/AgCl Adhesive Pads\u003c\/h1\u003e\n\n\u003cp class=\"product-lede\"\u003eThis adhesive ECG electrode patch features Ag\/AgCl conductive gel for reliable bio-signal acquisition, suitable for heart rate monitoring and biomedical projects with Arduino, ESP32, and Raspberry Pi.\u003c\/p\u003e\n\n\u003ch2\u003eKey Specifications\u003c\/h2\u003e\n\u003ctable class=\"specs-table\"\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eElectrode Type\u003c\/td\u003e\n\u003ctd\u003eAg\/AgCl (Silver \/ Silver Chloride)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e24 mm (typical)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eAdhesive\u003c\/td\u003e\n\u003ctd\u003eMedical-grade acrylic\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eGel Type\u003c\/td\u003e\n\u003ctd\u003eSolid hydrogel, conductive\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCable Connector\u003c\/td\u003e\n\u003ctd\u003eSnap button (3.5 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePack Size\u003c\/td\u003e\n\u003ctd\u003e10 patches per pack\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eShelf Life\u003c\/td\u003e\n\u003ctd\u003e18 months (unopened)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eIntended Use\u003c\/td\u003e\n\u003ctd\u003eSingle-use, disposable\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWhat You Can Build With This\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/kit-resting-heart-rate-monitor\"\u003e\n\u003cstrong\u003eSimple Heart Rate Monitor:\u003c\/strong\u003e Build a beginner Arduino project that detects heartbeats using an AD8232 module and displays BPM on an LCD.\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWireless ECG on ESP32:\u003c\/strong\u003e Transmit real-time ECG waveforms to Blynk or a web dashboard via Wi‑Fi for remote health monitoring.\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/kit-sd-card-data-log-to-csv\"\u003e\n\u003cstrong\u003eRaspberry Pi Bio‑Logger:\u003c\/strong\u003e Log ECG data to a CSV file and plot signals using Python and an external ADC (MCP3008) for offline analysis.\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/kit-atl-friction-measurement-lab-kit\"\u003e\n\u003cstrong\u003eBio‑Potential Measurement (CBSE Practical):\u003c\/strong\u003e Demonstrate skin electrode recording in a 12th‑grade biology\/electronics experiment or ATL Tinkering Lab.\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSmart Health Monitoring System:\u003c\/strong\u003e Integrate ECG, SpO₂, and temperature sensors for an IoT‑based patient tracking project (B.Tech final‑year or Smart India Hackathon).\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003ctable class=\"compat-table\"\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003ePlatform\u003c\/th\u003e\n\u003cth\u003eCompatible\u003c\/th\u003e\n\u003cth\u003eConnection\u003c\/th\u003e\n\u003cth\u003eLibrary \/ Method\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eArduino Uno R3\u003c\/td\u003e\n\u003ctd\u003eYes with AD8232\u003c\/td\u003e\n\u003ctd\u003eAnalog pin A0 (via AD8232)\u003c\/td\u003e\n\u003ctd\u003eSparkFun AD8232 library\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eArduino Nano\u003c\/td\u003e\n\u003ctd\u003eYes with AD8232\u003c\/td\u003e\n\u003ctd\u003eAnalog pin A0 (via AD8232)\u003c\/td\u003e\n\u003ctd\u003eSparkFun AD8232 library\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eArduino Mega 2560\u003c\/td\u003e\n\u003ctd\u003eYes with AD8232\u003c\/td\u003e\n\u003ctd\u003eAnalog pin A0 (via AD8232)\u003c\/td\u003e\n\u003ctd\u003eSparkFun AD8232 library\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eESP8266 NodeMCU\u003c\/td\u003e\n\u003ctd\u003eYes with AD8232\u003c\/td\u003e\n\u003ctd\u003eAnalog pin A0 (max 1 V input; use 3.3 V version)\u003c\/td\u003e\n\u003ctd\u003eAD8232 library + ESP8266WiFi\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eESP32 Dev Board\u003c\/td\u003e\n\u003ctd\u003eYes with AD8232\u003c\/td\u003e\n\u003ctd\u003eADC1 channel 0 (GPIO36)\u003c\/td\u003e\n\u003ctd\u003eAD8232 library, built‑in ADC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRaspberry Pi Pico\u003c\/td\u003e\n\u003ctd\u003eYes with AD8232\u003c\/td\u003e\n\u003ctd\u003eADC0 (GP26)\u003c\/td\u003e\n\u003ctd\u003eMicroPython ADC or Arduino‑Pico core\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRaspberry Pi 4 \/ 5\u003c\/td\u003e\n\u003ctd\u003eYes with external ADC\u003c\/td\u003e\n\u003ctd\u003eMCP3008 via SPI (GPIO pins)\u003c\/td\u003e\n\u003ctd\u003eAdafruit MCP3008, Python\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWiring and Interface Notes\u003c\/h2\u003e\n\u003cp\u003eConnect the electrode’s snap to the input of an AD8232 single‑lead heart‑rate monitor; the module’s output goes to an analog pin of your microcontroller. Operate the AD8232 at 3.3 V or 5 V depending on your board, ensuring the output voltage does not exceed the ADC maximum. For clean signals, prepare the skin with an alcohol wipe and press the patch firmly—avoid movement during measurement.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"faq\"\u003e\n  \u003cdiv class=\"faq-item\"\u003e\n    \u003ch3\u003eDo these electrodes require conductive gel?\u003c\/h3\u003e\n    \u003cp\u003eNo, each patch comes with pre‑applied Ag\/AgCl hydrogel, so you can use them straight out of the package.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"faq-item\"\u003e\n    \u003ch3\u003eCan these electrodes be reused?\u003c\/h3\u003e\n    \u003cp\u003eThese are single‑use, disposable electrodes; reusing them often leads to poor adhesion and degraded signal quality.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@graph\": [\n    {\n      \"@type\": \"Product\",\n      \"@id\": \"https:\/\/compoden.in\/products\/electrode-patch-adhesive-ecg-electrode-for-biomedical-projects#product\",\n      \"name\": \"ECG Electrode Patch – Ag\/AgCl Adhesive Pads\",\n      \"description\": \"Buy adhesive ECG electrode patches with Ag\/AgCl gel for bio-signal monitoring. Ideal for Arduino, ESP32, Raspberry Pi projects. ₹450 at Compoden India.\",\n      \"sku\": \"CDN-0987\",\n      \"mpn\": \"CDN-0987\",\n      \"brand\": {\"@type\": \"Brand\", \"name\": \"Compoden\"},\n      \"offers\": {\n        \"@type\": \"Offer\",\n        \"priceCurrency\": \"INR\",\n        \"price\": \"PRICE_PLACEHOLDER\",\n        \"availability\": \"https:\/\/schema.org\/InStock\",\n        \"seller\": {\"@type\": \"Organization\", \"name\": \"Compoden\", \"url\": \"https:\/\/compoden.in\"}\n      }\n    },\n    {\n      \"@type\": \"FAQPage\",\n      \"@id\": \"https:\/\/compoden.in\/products\/electrode-patch-adhesive-ecg-electrode-for-biomedical-projects#faq\",\n      \"mainEntity\": [\n        {\"@type\": \"Question\", \"name\": \"Do these electrodes require conductive gel?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No, each patch comes with pre‑applied Ag\/AgCl hydrogel, so you can use them straight out of the package.\"}},\n        {\"@type\": \"Question\", \"name\": \"Can these electrodes be reused?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"These are single‑use, disposable electrodes; reusing them often leads to poor adhesion and degraded signal quality.\"}}\n      ]\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"Compoden","offers":[{"title":"Default Title","offer_id":53454858879341,"sku":"CDN-0987","price":530.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0999\/3997\/5533\/files\/p_71d71fbb-2c91-40d9-8427-4eb8d33420db.jpg?v=1782232976"},{"product_id":"copper-tape-conductive-adhesive-tape-for-electronics-projects","title":"Copper Tape – Conductive Adhesive Tape for Electronics Projects","description":"\u003ch1\u003eCopper Tape with Conductive Adhesive for Electronics Projects\u003c\/h1\u003e\n\n\u003cp class=\"product-lede\"\u003eThis copper tape features a conductive adhesive backing, making it ideal for creating flexible circuits, repairing PCB traces, building touch sensors, and providing EMI shielding in Arduino, ESP32, and Raspberry Pi projects.\u003c\/p\u003e\n\n\u003ch2\u003eKey Specifications\u003c\/h2\u003e\n\u003ctable class=\"specs-table\"\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eCopper (99.9% pure)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eAdhesive\u003c\/td\u003e\n\u003ctd\u003eConductive acrylic\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eWidth\u003c\/td\u003e\n\u003ctd\u003e5 mm (also available in 10 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e5 meters\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eThickness\u003c\/td\u003e\n\u003ctd\u003e0.05 mm (tape only)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSurface Resistivity\u003c\/td\u003e\n\u003ctd\u003e≤0.1 Ω\/sq\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003e-20°C to +120°C\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWhat You Can Build With This\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/kit-paper-circuit-greeting-card-kit\"\u003e\n\u003cstrong\u003ePaper Circuit LED Card:\u003c\/strong\u003e Create a simple light‑up greeting card using copper tape traces and an LED on paper, perfect for Arduino beginners exploring basic circuits.\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCapacitive Touch Panel:\u003c\/strong\u003e Build an ESP32 IoT control surface with copper tape touch pads that detect finger proximity, integrating with home automation via Wi‑Fi.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGPIO Trace Repair:\u003c\/strong\u003e Fix a broken trace on a Raspberry Pi expansion board with copper tape and a quick solder joint, restoring connectivity without replacing the PCB.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eContinuity Tester Class Project:\u003c\/strong\u003e CBSE Class 11–12 students can construct a simple continuity tester on a breadboard using copper tape as a flexible conductor to explore electrical conductivity.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlexible Wearable Sensor:\u003c\/strong\u003e B.Tech final‑year or Smart India Hackathon teams can design a stretchable pulse‑monitoring wristband with copper tape interconnects for real‑time health data.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003ctable class=\"compat-table\"\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003ePlatform\u003c\/th\u003e\n\u003cth\u003eCompatible\u003c\/th\u003e\n\u003cth\u003eConnection\u003c\/th\u003e\n\u003cth\u003eLibrary \/ Method\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eArduino Uno R3\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eAny GPIO pin via soldering or adhesive\u003c\/td\u003e\n\u003ctd\u003eN\/A (passive component)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eArduino Nano\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eAny GPIO pin via soldering or adhesive\u003c\/td\u003e\n\u003ctd\u003eN\/A (passive component)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eArduino Mega 2560\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eAny GPIO pin via soldering or adhesive\u003c\/td\u003e\n\u003ctd\u003eN\/A (passive component)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eESP8266 NodeMCU\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eAny GPIO pin via soldering or adhesive\u003c\/td\u003e\n\u003ctd\u003eN\/A (passive component)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eESP32 Dev Board\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eAny GPIO pin via soldering or adhesive\u003c\/td\u003e\n\u003ctd\u003eN\/A (passive component)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRaspberry Pi Pico\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eAny GPIO pin via soldering or adhesive\u003c\/td\u003e\n\u003ctd\u003eN\/A (passive component)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRaspberry Pi 4 \/ 5\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eAny GPIO pin via soldering or adhesive\u003c\/td\u003e\n\u003ctd\u003eN\/A (passive component)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWiring and Interface Notes\u003c\/h2\u003e\n\u003cp\u003eCopper tape can be soldered using a low-temperature iron; work quickly to avoid melting the adhesive. For temporary connections, simply press the tape onto a clean, dry surface—the conductive adhesive provides immediate electrical contact. The tape handles up to 12 V DC safely; for higher voltages, reinforce joints with solder or mechanical clamping.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"faq\"\u003e\n  \u003cdiv class=\"faq-item\"\u003e\n    \u003ch3\u003eCan I solder components directly onto the copper tape?\u003c\/h3\u003e\n    \u003cp\u003eYes, but use a fine-tip soldering iron and keep contact short to prevent adhesive damage. Pre-tinning the tape helps create a reliable joint.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"faq-item\"\u003e\n    \u003ch3\u003eIs the adhesive strong enough for permanent circuits?\u003c\/h3\u003e\n    \u003cp\u003eThe conductive adhesive holds well for low-stress applications, but for permanent or moving parts, solder joints or additional mechanical support are recommended.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@graph\": [\n    {\n      \"@type\": \"Product\",\n      \"@id\": \"https:\/\/compoden.in\/products\/copper-tape-conductive-adhesive-tape-for-electronics-projects#product\",\n      \"name\": \"Copper Tape with Conductive Adhesive for Electronics Projects\",\n      \"description\": \"Conductive copper tape for DIY PCB repair, touch sensors, EMI shielding. Works with Arduino, ESP32, Raspberry Pi. 5m roll. Buy online at Compoden India.\",\n      \"sku\": \"CDN-0996\",\n      \"mpn\": \"CDN-0996\",\n      \"brand\": {\"@type\": \"Brand\", \"name\": \"Compoden\"},\n      \"offers\": {\n        \"@type\": \"Offer\",\n        \"priceCurrency\": \"INR\",\n        \"price\": \"PRICE_PLACEHOLDER\",\n        \"availability\": \"https:\/\/schema.org\/InStock\",\n        \"seller\": {\"@type\": \"Organization\", \"name\": \"Compoden\", \"url\": \"https:\/\/compoden.in\"}\n      }\n    },\n    {\n      \"@type\": \"FAQPage\",\n      \"@id\": \"https:\/\/compoden.in\/products\/copper-tape-conductive-adhesive-tape-for-electronics-projects#faq\",\n      \"mainEntity\": [\n        {\"@type\": \"Question\", \"name\": \"Can I solder components directly onto the copper tape?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes, but use a fine-tip soldering iron and keep contact short to prevent adhesive damage. Pre-tinning the tape helps create a reliable joint.\"}},\n        {\"@type\": \"Question\", \"name\": \"Is the adhesive strong enough for permanent circuits?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The conductive adhesive holds well for low-stress applications, but for permanent or moving parts, solder joints or additional mechanical support are recommended.\"}}\n      ]\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"Compoden","offers":[{"title":"Default Title","offer_id":53454859174253,"sku":"CDN-0996","price":470.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0999\/3997\/5533\/files\/p_0548466f-b593-417c-9966-dd5f483917ca.jpg?v=1782232089"},{"product_id":"m3-nuts-and-bolts-kit-200-piece-hardware-set-for-electronics","title":"M3 Nuts and Bolts Kit – 200 Piece Hardware Set for Electronics","description":"\u003ch1\u003eM3 Nuts and Bolts Kit – 200 Piece Electronics Hardware Set\u003c\/h1\u003e\n\n\u003cp class=\"product-lede\"\u003eA 200-piece M3 hardware kit with hex bolts (6-20 mm lengths) and nuts, essential for mounting Arduino, ESP32, Raspberry Pi boards, sensors, and 3D printed enclosures in prototyping projects.\u003c\/p\u003e\n\n\u003ch2\u003eKey Specifications\u003c\/h2\u003e\n\u003ctable class=\"specs-table\"\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eStainless Steel (A2) or Zinc-plated Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eFinish\u003c\/td\u003e\n\u003ctd\u003ePlain (stainless) or Zinc Plated\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eThread Size\u003c\/td\u003e\n\u003ctd\u003eM3 × 0.5 mm (standard metric coarse)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBolt Lengths Included\u003c\/td\u003e\n\u003ctd\u003e6 mm, 10 mm, 12 mm, 16 mm, 20 mm (approx distribution)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eHead Type\u003c\/td\u003e\n\u003ctd\u003eHex Socket Cap (Allen key driven)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eQuantity\u003c\/td\u003e\n\u003ctd\u003e~200 pieces (mix of bolts and nuts)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eNut Type\u003c\/td\u003e\n\u003ctd\u003eHex nuts, M3 thread\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eDrive Size (Hex Key)\u003c\/td\u003e\n\u003ctd\u003e2 mm (typically included or user-supplied)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWhat You Can Build With This\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSimple LED matrix stand:\u003c\/strong\u003e Secure an 8×8 matrix to a rigid base using M3 bolts and standoffs for a stable beginner display project.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeather station enclosure:\u003c\/strong\u003e Fasten an ESP32 and environmental sensors inside a 3D printed box, protected by M3 screws.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePi camera mount:\u003c\/strong\u003e Attach a Raspberry Pi camera module to a tripod or bracket with M3 bolts for time‑lapse or monitoring applications.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCBSE class 11‑12 electric circuit board:\u003c\/strong\u003e Mount battery holders, switches, and wiring on a wooden demonstration board using M3 hardware.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSmart irrigation prototype (SIH):\u003c\/strong\u003e Assemble a water‑resistant housing for soil moisture sensors and a microcontroller with M3 bolts for field deployments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003ctable class=\"compat-table\"\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003ePlatform\u003c\/th\u003e\n\u003cth\u003eCompatible\u003c\/th\u003e\n\u003cth\u003eConnection\u003c\/th\u003e\n\u003cth\u003eLibrary \/ Method\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eArduino Uno R3\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eM3 bolts through board mounting holes (3.2 mm)\u003c\/td\u003e\n\u003ctd\u003eN\/A (mechanical only)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eArduino Nano\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eM3 bolts through board mounting holes\u003c\/td\u003e\n\u003ctd\u003eN\/A (mechanical only)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eArduino Mega 2560\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eM3 bolts through board mounting holes\u003c\/td\u003e\n\u003ctd\u003eN\/A (mechanical only)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eESP8266 NodeMCU\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eM3 bolts through board mounting holes\u003c\/td\u003e\n\u003ctd\u003eN\/A (mechanical only)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eESP32 Dev Board\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eM3 bolts through board mounting holes\u003c\/td\u003e\n\u003ctd\u003eN\/A (mechanical only)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRaspberry Pi Pico\u003c\/td\u003e\n\u003ctd\u003eYes with bracket\u003c\/td\u003e\n\u003ctd\u003eUse PCB standoffs; Pico lacks direct M3 holes\u003c\/td\u003e\n\u003ctd\u003eN\/A (mechanical only)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRaspberry Pi 4 \/ 5\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003ctd\u003eM3 bolts through board mounting holes\u003c\/td\u003e\n\u003ctd\u003eN\/A (mechanical only)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWiring and Interface Notes\u003c\/h2\u003e\n\u003cp\u003eM3 bolts are purely mechanical; they do not carry electrical signals. Use plastic or nylon washers when mounting on PCB boards near traces to prevent shorts. Tighten bolts to ~0.5 N·m torque to avoid stripping threads.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"faq\"\u003e\n  \u003cdiv class=\"faq-item\"\u003e\n    \u003ch3\u003eAre these bolts compatible with Arduino board mounting holes?\u003c\/h3\u003e\n    \u003cp\u003eYes, standard Arduino boards (Uno, Mega) have M3 clearance holes (3.2 mm). These bolts fit directly.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"faq-item\"\u003e\n    \u003ch3\u003eCan I use this kit for 3D printed projects?\u003c\/h3\u003e\n    \u003cp\u003eYes, M3 is the most common size for 3D printed enclosures and brackets. The included lengths accommodate wall thicknesses up to 6 mm.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@graph\": [\n    {\n      \"@type\": \"Product\",\n      \"@id\": \"https:\/\/compoden.in\/products\/m3-nuts-and-bolts-kit-200-piece-hardware-set-for-electronics#product\",\n      \"name\": \"M3 Nuts and Bolts Kit – 200 Piece Electronics Hardware Set\",\n      \"description\": \"200pc M3 nuts and bolts kit for Arduino, ESP32, Raspberry Pi. Hex bolts 6mm-20mm, nuts, stainless steel. Secure PCBs, sensors, enclosures. Compoden India.\",\n      \"sku\": \"CDN-0998\",\n      \"mpn\": \"CDN-0998\",\n      \"brand\": {\"@type\": \"Brand\", \"name\": \"Compoden\"},\n      \"offers\": {\n        \"@type\": \"Offer\",\n        \"priceCurrency\": \"INR\",\n        \"price\": \"PRICE_PLACEHOLDER\",\n        \"availability\": \"https:\/\/schema.org\/InStock\",\n        \"seller\": {\"@type\": \"Organization\", \"name\": \"Compoden\", \"url\": \"https:\/\/compoden.in\"}\n      }\n    },\n    {\n      \"@type\": \"FAQPage\",\n      \"@id\": \"https:\/\/compoden.in\/products\/m3-nuts-and-bolts-kit-200-piece-hardware-set-for-electronics#faq\",\n      \"mainEntity\": [\n        {\"@type\": \"Question\", \"name\": \"Are these bolts compatible with Arduino board mounting holes?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes, standard Arduino boards (Uno, Mega) have M3 clearance holes (3.2 mm). These bolts fit directly.\"}},\n        {\"@type\": \"Question\", \"name\": \"Can I use this kit for 3D printed projects?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes, M3 is the most common size for 3D printed enclosures and brackets. The included lengths accommodate wall thicknesses up to 6 mm.\"}}\n      ]\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"Compoden","offers":[{"title":"Default Title","offer_id":53454859207021,"sku":"CDN-0998","price":180.0,"currency_code":"INR","in_stock":true}]}],"url":"https:\/\/compoden.com\/collections\/modules.oembed","provider":"Compoden","version":"1.0","type":"link"}