{"title":"Current Sensors","description":"\u003cp\u003eA current sensor shows what your project actually draws. That tells you how long a battery will last, whether a motor has stalled, and how much energy an appliance uses.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe \u003cstrong\u003eINA219\u003c\/strong\u003e measures current, bus voltage and power over I2C. It is accurate enough to keep a running mAh total on an ESP32 with a small OLED.\u003c\/li\u003e\n\u003cli\u003eThe \u003cstrong\u003eINA3221\u003c\/strong\u003e watches three channels at once.\u003c\/li\u003e\n\u003cli\u003eHall-effect sensors such as the \u003cstrong\u003eACS712\u003c\/strong\u003e (5A, 20A and 30A versions) measure larger currents. Our builds use the ACS712 for AC current.\u003c\/li\u003e\n\u003cli\u003eFor a whole home, a \u003cstrong\u003enon-invasive clamp sensor\u003c\/strong\u003e with a burden circuit reads mains current without cutting any wires.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eHow to choose:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePick an INA219 or INA3221 for low-voltage DC projects where you also want voltage and power.\u003c\/li\u003e\n\u003cli\u003ePick an ACS-series sensor for higher currents.\u003c\/li\u003e\n\u003cli\u003ePick a clamp sensor for mains energy monitoring.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eAccuracy depends on the shunt resistor. The current flows through this small, precise resistor, and the sensor reads the voltage across it, so pick a range that matches your load.\u003c\/p\u003e\n\u003cp\u003eMains measurement carries real risk. Clamp sensors avoid touching live wiring; never open live mains circuits.\u003c\/p\u003e\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003ch3\u003eWhy measure current in a project?\u003c\/h3\u003e\n\u003cp\u003eTo estimate battery life, catch a stalled or jammed motor, and track energy use.\u003c\/p\u003e\n\u003ch3\u003eINA219 or ACS712?\u003c\/h3\u003e\n\u003cp\u003eThe INA219 for precise low-voltage DC with voltage and power. The ACS712 for larger currents, including AC.\u003c\/p\u003e\n\u003ch3\u003eWhat does the shunt resistor do?\u003c\/h3\u003e\n\u003cp\u003eCurrent passes through it, and the sensor reads the small voltage across it. Its value sets range and accuracy.\u003c\/p\u003e\n\u003ch3\u003eHow do I measure home energy safely?\u003c\/h3\u003e\n\u003cp\u003eUse a non-invasive clamp sensor around one wire, so you never touch live mains.\u003c\/p\u003e\n\u003ch2\u003eGuides\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/blogs\/guides\/ina219-esp32-current-power-mah-oled\"\u003eMeasure Current, Power and mAh With an INA219 on an ESP32 (Live OLED Readout)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/blogs\/guides\/how-to-build-smart-energy-monitor\"\u003eHow to Build a Smart Energy Monitor\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Why measure current in a project?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"To estimate battery life, catch a stalled or jammed motor, and track energy use.\"}}, {\"@type\": \"Question\", \"name\": \"INA219 or ACS712?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The INA219 for precise low-voltage DC with voltage and power. The ACS712 for larger currents, including AC.\"}}, {\"@type\": \"Question\", \"name\": \"What does the shunt resistor do?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Current passes through it, and the sensor reads the small voltage across it. Its value sets range and accuracy.\"}}, {\"@type\": \"Question\", \"name\": \"How do I measure home energy safely?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Use a non-invasive clamp sensor around one wire, so you never touch live mains.\"}}]}\u003c\/script\u003e\n\u003ch2\u003eReference pages on soldr.ai\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/soldr.ai\/docs\/components\/acs712-20a\"\u003eACS712 20A current sensor\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/soldr.ai\/docs\/components\/zht103\"\u003eZHT103 AC current sensor\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/soldr.ai\/docs\/components\/ina219\"\u003eINA219 current sensor (CJMCU-219)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eMore guides on soldr.ai\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/soldr.ai\/blog\/esp32-arduino-power-budget-usb\"\u003ePower budget guide\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eDescribe your build on \u003ca href=\"https:\/\/app.soldr.ai\"\u003eSoldr\u003c\/a\u003e and it picks the parts, writes and compiles the code, and shows how to wire them. Sign in and get 100 credits free.\u003c\/p\u003e","products":[{"product_id":"zmct103c-10a-ac-current-transformer-sensor-compoden","title":"ZMCT103C 10A AC Current Transformer Sensor | Compoden","description":"\u003ch1\u003eZMCT103C 10A AC Current Transformer Sensor\u003c\/h1\u003e\n\n\u003cp\u003eThe ZMCT103C is a non-invasive AC current transformer capable of measuring up to 10A. It outputs a proportional AC voltage via a built-in burden resistor, making it easy to interface with microcontrollers. Ideal for energy monitoring, smart power meters, and overcurrent protection systems.\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\u003eModel\u003c\/td\u003e\n\u003ctd\u003eZMCT103C\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eInput Current Range\u003c\/td\u003e\n\u003ctd\u003e0–10A AC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTurns Ratio\u003c\/td\u003e\n\u003ctd\u003e1000:1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eOutput Type\u003c\/td\u003e\n\u003ctd\u003eAC voltage (proportional to current)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBurden Resistor\u003c\/td\u003e\n\u003ctd\u003eBuilt-in (typically 62Ω)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eOperating Frequency\u003c\/td\u003e\n\u003ctd\u003e50–60 Hz\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\/smart-energy-monitor-kit-build-a-classroom-power-logger-with-arduino\"\u003eDIY home energy monitor with Arduino and an LCD display\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003eOvercurrent protection relay for appliances using an ESP32\u003c\/li\u003e\n  \u003cli\u003eSmart plug that logs power consumption to the cloud via Wi-Fi\u003c\/li\u003e\n  \u003cli\u003eLaboratory AC current meter with a microcontroller and OLED screen\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eThe ZMCT103C works with any microcontroller that has an analog input, including Arduino Uno, Mega, ESP8266, ESP32, and STM32. Its output voltage is within 0–1V AC for the rated current, so an ADC with at least 10-bit resolution is recommended. For 3.3V boards, use a voltage divider or select a suitable burden resistor if adjustable.\u003c\/p\u003e\n\n\u003ch2\u003eWiring Notes\u003c\/h2\u003e\n\u003cp\u003eConnect the output pin to an analog input; the transformer provides an AC signal centered around 0V. To measure with a single-ended ADC, bias the signal to mid-supply using a resistor divider or an op-amp circuit. No external power supply is needed for the sensor itself.\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 3-7 days. If defective on arrival, replace within 7 days.\u003c\/p\u003e\n\n\u003cdetails\u003e\u003csummary\u003eIs this compatible with Arduino Uno?\u003c\/summary\u003e\u003cp\u003eYes, but bias the output to mid-supply (resistor divider + capacitor) before the Uno's analog pin; do not connect the bare AC output directly. Then use analogRead() and apply calibration to convert to current.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eCan I measure DC current with this?\u003c\/summary\u003e\u003cp\u003eNo, this is an AC current transformer and only works with alternating current. For DC current, consider a Hall effect sensor like the ACS712.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eDoes it require an external burden resistor?\u003c\/summary\u003e\u003cp\u003eNo, the ZMCT103C module includes a built-in burden resistor (usually 62Ω), so no external burden resistor is needed (still bias the output to mid-supply before the ADC). If you need a different output range, you can modify the onboard resistor.\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":53444953702765,"sku":"CDN-0225","price":60.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0999\/3997\/5533\/files\/zmct103c-10a-ac-current-transformer-sensor-compoden-9577677.jpg?v=1790780228"},{"product_id":"ina219-bi-directional-current-sensor-i2c-module-cjmcu-219","title":"INA219 Bi-Directional Current Sensor I2C Module – CJMCU-219","description":"\u003ch1\u003eCJMCU-219 INA219 I2C Bi-Directional Current and Power Sensor – Zero Drift\u003c\/h1\u003e\u003cp\u003eThe CJMCU-219 is a compact breakout board featuring the INA219 chip, a high-accuracy current and power monitor with I2C interface. It measures bi-directional DC current, voltage, and power with excellent linearity and zero drift, making it ideal for battery-powered projects, power monitoring, and energy tracking. The module operates over a wide voltage range and supports standard I2C communication for seamless integration with microcontrollers.\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\u003eBus Voltage Range\u003c\/td\u003e\n\u003ctd\u003e0 – 26 V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent Measurement Range\u003c\/td\u003e\n\u003ctd\u003e±3.2 A (with 0.1 Ω shunt)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution\u003c\/td\u003e\n\u003ctd\u003e12-bit ADC (0.1 mA current LSB)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInterface\u003c\/td\u003e\n\u003ctd\u003eI2C (addresses 0x40 – 0x4F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLogic Voltage\u003c\/td\u003e\n\u003ctd\u003e3.3 V \/ 5 V compatible\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\u003eBattery fuel gauge for solar or Li-ion systems\u003c\/li\u003e\n\u003cli\u003eReal-time power consumption monitor for IoT devices\u003c\/li\u003e\n\u003cli\u003eOvercurrent protection circuit for lab supplies\u003c\/li\u003e\n\u003cli\u003eEnergy auditing tool to profile DC load profiles\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCompatibility\u003c\/h2\u003e\u003cp\u003eThis module works with any 3.3 V or 5 V microcontroller that supports I2C, including Arduino Uno, Nano, Mega, ESP8266, ESP32, and STM32 platforms. For Raspberry Pi or other 3.3 V-only boards, direct connection is fine—no level shifting required. Common pairings include the Adafruit INA219 library for Arduino or CircuitPython.\u003c\/p\u003e\u003ch2\u003eWiring Notes\u003c\/h2\u003e\u003cp\u003eConnect VCC to 3.3 V or 5 V, GND to ground, SDA and SCL to the corresponding I2C pins. The I2C lines may need external 4.7 kΩ pull-up resistors if your board does not provide them. For current sensing, wire the load in series with the high-side shunt terminals (Vin+ and Vin-) and ensure the common ground is shared.\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 3-7 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 CJMCU-219 works with standard Arduino libraries like Adafruit INA219. Just connect SDA to A4 and SCL to A5 on Uno boards.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eHow do I measure currents above 3.2 A?\u003c\/summary\u003e\u003cp\u003eReplace the onboard 0.1 Ω shunt with a smaller value (e.g., 0.01 Ω) and adjust the calibration register in software; always ensure power dissipation is within safe limits.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eDoes it measure AC current?\u003c\/summary\u003e\u003cp\u003eNo, this module measures bidirectional DC current. For AC measurement, consider a current transformer or Hall-effect sensor like the ACS712.\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":53444953997677,"sku":"CDN-0235","price":100.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0999\/3997\/5533\/files\/ina219-bi-directional-current-sensor-i2c-module-cjmcu-219-1815310.jpg?v=1790780226"},{"product_id":"zht103-5a-single-phase-ac-current-sensor-module-compoden","title":"ZHT103 5A Single-Phase AC Current Sensor Module | Compoden","description":"\u003ch1\u003eZHT103 5A Single-Phase AC Current Sensor Module — Analog Output\u003c\/h1\u003e\n\u003cp\u003eThe ZHT103 is a compact AC current sensor module designed to measure alternating current up to 5 amps in single-phase circuits. It outputs an analog voltage proportional to the measured current, making it easy to interface with microcontrollers like Arduino or ESP32 for power monitoring, energy auditing, or motor control feedback systems. With built-in isolation, it provides a safe and non-invasive way to track current without direct contact.\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\u003eMeasurement Range\u003c\/td\u003e\n\u003ctd\u003e0 to 5A AC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Type\u003c\/td\u003e\n\u003ctd\u003eAnalog Voltage (0–1V RMS proportional)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSensitivity\u003c\/td\u003e\n\u003ctd\u003e185 mV\/A (typical)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupply Voltage\u003c\/td\u003e\n\u003ctd\u003e5V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrequency Range\u003c\/td\u003e\n\u003ctd\u003e50Hz \/ 60Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAccuracy\u003c\/td\u003e\n\u003ctd\u003e±1% (at rated current)\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\u003e\u003ca href=\"\/products\/smart-energy-monitor-kit-build-a-classroom-power-logger-with-arduino\"\u003eDIY home energy monitor to track appliance power consumption.\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003eOvercurrent protection circuit for motors or power supplies.\u003c\/li\u003e\n\u003cli\u003eSmart irrigation system with pump current sensing.\u003c\/li\u003e\n\u003cli\u003eReal-time electricity usage logger with IoT dashboard.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eThis module works with any microcontroller that has an analog-to-digital converter (ADC), such as Arduino Uno, Nano, ESP8266, ESP32, or Raspberry Pi Pico. It requires a 5V supply and outputs a voltage within 0–1V RMS, which can be read directly via ADC; for 3.3V systems, a level shifter may be needed. Commonly paired with relay modules for full control and monitoring of AC loads.\u003c\/p\u003e\n\u003ch2\u003eWiring Notes\u003c\/h2\u003e\n\u003cp\u003eConnect the sensor’s VCC to 5V, GND to ground, and the analog output (OUT) to an ADC pin. Since the output is AC, you’ll need to sample it rapidly and calculate RMS in software; no external pull-ups are required. Ensure the measured current does not exceed 5A to avoid saturation.\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 3-7 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, connect the analog output to any Arduino ADC pin and use a 5V supply. Sample the AC waveform to calculate RMS current.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eCan it measure DC current?\u003c\/summary\u003e\u003cp\u003eNo, this sensor is designed for AC only (50\/60 Hz). For DC current measurement, consider a hall-effect sensor like the ACS712.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eDo I need any external components?\u003c\/summary\u003e\u003cp\u003eNo additional components are required; the module is ready to use. Just connect power, ground, and signal to your microcontroller.\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":53444955111789,"sku":"CDN-0260","price":65.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0999\/3997\/5533\/files\/zht103-5a-single-phase-ac-current-sensor-module-compoden-8095210.jpg?v=1790780167"},{"product_id":"acs712-5a-current-sensor-module-precise-hall-effect-measurement","title":"ACS712 5A Current Sensor Module - Precise Hall-Effect Measurement","description":"\u003ch1\u003eACS712 5A Current Sensor Module – 5A Hall-Effect Current Monitoring\u003c\/h1\u003e\n\n\u003cp\u003eThe ACS712 5A Current Sensor Module provides precise current measurement using Allegro’s hall-effect technology. It outputs an analog voltage linearly proportional to sensed current, making it ideal for microcontroller-based projects. Use it to monitor power consumption, protect circuits, or build smart energy meters.\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\u003eCurrent Range\u003c\/td\u003e\n\u003ctd\u003e±5A\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSensitivity\u003c\/td\u003e\n\u003ctd\u003e185 mV\/A\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSupply Voltage\u003c\/td\u003e\n\u003ctd\u003e5V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eOutput Type\u003c\/td\u003e\n\u003ctd\u003eAnalog (0–5V)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBandwidth\u003c\/td\u003e\n\u003ctd\u003e80 kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eIsolation Voltage\u003c\/td\u003e\n\u003ctd\u003e2.1 kVRMS\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-bench-power-supply-monitor\"\u003eOvercurrent protection circuit for a bench power supply\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003eReal-time current monitoring dashboard with Arduino and OLED\u003c\/li\u003e\n  \u003cli\u003eBattery charge\/discharge logger for solar setups\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/kit-motor-stall-detection-system\"\u003eMotor stall detection in robotics projects\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eWorks with 5V microcontrollers that have an analog input, such as Arduino Uno and Nano. On an ESP8266 the ADC accepts 0-1.0 V only (about 0-3.3 V on boards with a divider), so scale OUT down with a resistor divider before connecting it. Connect to 3.3V boards via voltage divider, though full 5V scale ensures best resolution. Commonly paired with I2C ADC modules for 3.3V systems.\u003c\/p\u003e\n\n\u003ch2\u003eWiring Notes\u003c\/h2\u003e\n\u003cp\u003eConnect VCC to 5V, GND to common ground, and OUT to an analog pin. The module passes current through screw terminals; ensure load is within 5A. For noisy environments, add a small capacitor near the VCC pin to reduce ripple.\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 3-7 days. If defective on arrival, replace within 7 days.\u003c\/p\u003e\n\n\u003cdetails\u003e\u003csummary\u003eIs this compatible with Arduino Uno?\u003c\/summary\u003e\u003cp\u003eYes, the ACS712 module works directly with Arduino Uno’s 5V analog inputs. Connect OUT to A0 and read the voltage to compute current.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eHow do I convert the analog output to current?\u003c\/summary\u003e\u003cp\u003eThe output voltage is 2.5V at zero current, with sensitivity 185 mV\/A. Subtract 2.5V from the reading, then divide by 0.185 to get current in amperes.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eCan I measure AC current with this module?\u003c\/summary\u003e\u003cp\u003eYes, the ACS712 can measure both AC and DC. For AC, you’ll need to sample quickly enough to capture the waveform and calculate RMS.\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":53444960616813,"sku":"CDN-0386","price":95.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0999\/3997\/5533\/files\/acs712-5a-current-sensor-module-precise-hall-effect-measurement-7947014.jpg?v=1790780106"},{"product_id":"sct103-non-invasive-ac-current-clamp-sensor-30a-for-monitoring","title":"SCT103 Non-invasive AC Current Clamp Sensor 30A for Monitoring","description":"\u003ch1\u003eSCT103 Non-invasive AC Current Sensor Clamp 30A\u003c\/h1\u003e\n\n\u003cp\u003eThe SCT103 is a non-invasive clamp current sensor designed to measure AC current up to 30A without breaking the circuit. Simply clip it around a live wire to get an isolated voltage output proportional to the current. Ideal for energy monitoring, power logging, and overcurrent protection in embedded 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\u003eCurrent Range\u003c\/td\u003e\n\u003ctd\u003e0 to 30A AC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eOutput Signal\u003c\/td\u003e\n\u003ctd\u003e0 to 1V (at 30A)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eFrequency Range\u003c\/td\u003e\n\u003ctd\u003e50Hz to 1kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eClamp Opening\u003c\/td\u003e\n\u003ctd\u003e13mm diameter\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eDielectric Strength\u003c\/td\u003e\n\u003ctd\u003e6000V AC for 1 minute\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCable Length\u003c\/td\u003e\n\u003ctd\u003e1.5 meters with 3.5mm jack\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\/smart-energy-monitor-kit-build-a-classroom-power-logger-with-arduino\"\u003eHome energy monitor using Arduino or ESP32\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003eSolar inverter output tracking\u003c\/li\u003e\n  \u003cli\u003eServer room PDU current logger\u003c\/li\u003e\n  \u003cli\u003eOvercurrent alarm system for appliances\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eWorks with any microcontroller with an analog-to-digital converter (ADC), such as Arduino Uno, Nano, ESP8266, ESP32, Raspberry Pi (with ADC), STM32, and PIC. The output is 0–1V AC, offset to half the reference voltage via a simple voltage divider for most ADCs. No external burden resistor needed for standard operation.\u003c\/p\u003e\n\n\u003ch2\u003eWiring Notes\u003c\/h2\u003e\n\u003cp\u003eConnect the sensor's output pin to an analog input. Add a 10kΩ resistor from the signal to ground and a 0.1µF capacitor in parallel for noise reduction. For 3.3V boards, use a voltage divider to scale the output accordingly. Always ensure the measured wire is disconnected from power when clamping for safety.\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 3-7 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 SCT103 works with any Arduino that has an analog pin. Connect VCC to 5V, GND to GND, and output to A0. Use the analogRead() function to measure voltage and convert to current using a calibration factor.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eHow do I calibrate the sensor?\u003c\/summary\u003e\u003cp\u003eCalibration involves applying a known load and adjusting the conversion factor in software. Multiply the ADC reading by the reference voltage, then by a scaling constant (approximately 30 for 30A range) to get amperes. Fine-tune with a multimeter for accuracy.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eCan it measure DC current?\u003c\/summary\u003e\u003cp\u003eNo, the SCT103 is a current transformer and only works with alternating current (AC). For DC measurements, consider a hall-effect sensor like ACS712.\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":53444998463853,"sku":"CDN-0613","price":360.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0999\/3997\/5533\/files\/sct103-non-invasive-ac-current-clamp-sensor-30a-for-monitoring-4547696.jpg?v=1790779986"},{"product_id":"acs712-30a-current-sensor-module","title":"ACS712 30A Current Sensor Module","description":"\u003cp\u003eUse this to measure current up to 30A with an analog output and full electrical isolation from the circuit being measured. Commonly used on servo robots, motor rigs and battery discharge logging where a 5A sensor is exceeded the moment the motors start. Not suitable for precise low currents — the 30A part trades resolution for range, so a 200mA load reads as noise; use a 5A or 20A part for small draws. Key specs: 30A bidirectional, 5V supply, analog output, isolated. Alternative: the 20A version for mid-range work, or an INA226 for anything below an amp.\u003c\/p\u003e","brand":"Compoden","offers":[{"title":"Default Title","offer_id":53793469268333,"sku":"CDN-3119","price":109.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0999\/3997\/5533\/files\/acs712-30a-current-sensor-module-6102261.png?v=1791034937"},{"product_id":"acs712-20a-current-sensor-module","title":"ACS712 20A Current Sensor Module","description":"\u003cp\u003eUse this to measure current up to 20A with better resolution than the 30A part, isolated from the circuit under test. Commonly used for motor current monitoring, pump and fan loads and battery discharge logging in the mid range. Not suitable above 20A, and not suitable for milliamp work — a Hall-effect sensor's resolution is a fixed fraction of its range, so small currents disappear into noise. Key specs: 20A bidirectional, 5V supply, analog output, isolated. Alternative: the 30A version if your peak exceeds 20A, or an INA226 for sub-amp measurement.\u003c\/p\u003e","brand":"Compoden","offers":[{"title":"Default Title","offer_id":53793469563245,"sku":"CDN-3120","price":99.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0999\/3997\/5533\/files\/acs712-20a-current-sensor-module-2864157.webp?v=1791034937"}],"url":"https:\/\/compoden.com\/collections\/current-sensors.oembed","provider":"Compoden","version":"1.0","type":"link"}