HC 05 Bluetooth Module 5V Wireless Serial Transceiver for Arduino, Raspberry Pi, Android, Robotics & IoT HC05 UART Master Slave

MASTER & SLAVE BLUETOOTH SUPPORT Unlike the HC-06, the HC-05 Bluetooth module operates in both Master and Slave modes, making it ideal for MCU-to-MCU communication, robotics, automation, and advanced IoT projects. EASY UART SERIAL INTEGRATION Simple TX / RX UART interface works seamlessly with Arduino, Raspberry Pi, ESP32, STM32, AVR, PIC, ARM, MSP430 and other microcontrollers—no Bluetooth protocol knowledge required. CONFIGURABLE VIA AT COMMANDS Enter AT command mode to change device name, PIN code, baud rate, role (master/slave) and power-saving settings. Automatically switches to transparent serial mode after pairing. 5V INPUT – 3.3V LOGIC SAFE Onboard voltage regulator accepts 3.6V–6V input (5V compatible) while maintaining safe 3.3V UART logic, no MAX232 required. Perfect for direct Arduino connection. STABLE CONNECTION & STATUS LED Built-in LED indicator clearly shows connection state: Fast blink = not paired Solid light = Bluetooth connected & serial port open Up to 10m reliable range in open space.