{"product_id":"hc-05-bluetooth-module-spp-24ghz-masterslave","title":"HC-05 Bluetooth Module – SPP, 2.4GHz, Master\/Slave","description":"\u003ch1\u003eHC-05 Bluetooth Module – SPP Protocol, Master\/Slave, 2.4GHz\u003c\/h1\u003e\n\u003cp\u003eThe HC-05 is a versatile Bluetooth serial communication module that enables wireless data transfer between microcontrollers and other Bluetooth devices. It operates on the SPP (Serial Port Profile) protocol and can be configured as a master or slave, making it ideal for projects that require cable-free serial links. With a range of up to 10 meters and support for common baud rates, it’s a staple in IoT, robotics, and home automation.\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\u003eBluetooth Version\u003c\/td\u003e\n\u003ctd\u003eV2.0+EDR\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eFrequency\u003c\/td\u003e\n\u003ctd\u003e2.4GHz ISM band\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eOperating Voltage\u003c\/td\u003e\n\u003ctd\u003e3.3V (5V tolerant on RX)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCurrent\u003c\/td\u003e\n\u003ctd\u003e30mA (paired), 8mA (standby)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRange\u003c\/td\u003e\n\u003ctd\u003eUp to 10 meters (open space)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBaud Rate\u003c\/td\u003e\n\u003ctd\u003e9600bps default (adjustable up to 1382400)\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\u003eWireless serial monitor for Arduino projects\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/kit-bluetooth-controlled-car\"\u003eBluetooth-controlled robot or RC car\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003eHome automation system with smartphone app\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/kit-soil-sensor-data-logger\"\u003eWireless sensor data logger\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eThe HC-05 works with any microcontroller that has a UART\/serial interface, including Arduino Uno, Mega, Nano, ESP32, and Raspberry Pi (with level shifting). It uses 3.3V logic, but the RX pin is 5V tolerant, allowing direct connection to 5V MCUs. Common pairings include using it with an Arduino Uno for a Bluetooth-controlled LED matrix or a Raspberry Pi for a wireless serial gateway.\u003c\/p\u003e\n\n\u003ch2\u003eWiring Notes\u003c\/h2\u003e\n\u003cp\u003eConnect VCC to 3.3V (or a regulated 5V if the module has an onboard regulator), GND to common ground, TX of HC-05 to RX of MCU, and RX to TX. Do not exceed 5V on the RX pin. For AT command mode to change settings, enter command mode by pulling the KEY\/EN pin high before powering up or pressing a button on some modules.\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 Uno?\u003c\/summary\u003e\u003cp\u003eYes, the HC-05 works perfectly with Arduino Uno. Connect HC-05 TX to Arduino RX (pin 0) and RX to TX (pin 1). Use the SoftwareSerial library if you need to keep the hardware serial for programming.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eHow do I switch between master and slave mode?\u003c\/summary\u003e\u003cp\u003eMode can be switched using AT commands via the serial interface. Enter command mode by pulling the KEY pin high before powering, then send AT commands to set the role.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eCan I power it directly from a 5V Arduino pin?\u003c\/summary\u003e\u003cp\u003eMost HC-05 modules have a voltage regulator and can be powered from 5V, but check your module’s labeling. If not, use a logic level converter or power from 3.3V.\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":53445068685677,"sku":"CDN-0897","price":240.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0999\/3997\/5533\/files\/image_1_5d593e04-5b55-4c70-bc59-dd42e5f1fc70.jpg?v=1781513135","url":"https:\/\/compoden.com\/products\/hc-05-bluetooth-module-spp-24ghz-masterslave","provider":"Compoden","version":"1.0","type":"link"}