HC-05 Bluetooth Module (6-Pin) with Onboard Button – Wireless Serial Communication Module

The HC-05 6-Pin Bluetooth Module is a widely used and reliable wireless communication solution designed for serial data transmission using a UART interface. It enables easy Bluetooth connectivity between microcontrollers and Bluetooth-enabled devices such as smartphones, tablets, and computers. With support for both Master and Slave modes, the HC-05 offers great flexibility for wireless control and data communication applications.

This module features an onboard push button that allows quick access to AT-command mode, making configuration simple and convenient. Users can easily change settings such as device name, baud rate, and operating mode without additional hardware. It operates within a voltage range of 3.3V to 5V thanks to the built-in voltage regulator, ensuring safe and direct connection to common development boards.

The HC-05 communicates through a standard UART serial interface using TX and RX pins, with a default baud rate of 9600 that can be adjusted via AT commands. A built-in status LED provides clear visual indication of power and connection state, helping users quickly understand the module’s operational status. The module also includes internal memory to retain configuration settings even after power is removed.

With a typical wireless range of up to 10 meters, the HC-05 Bluetooth module is well suited for short-range wireless applications. It is fully compatible with Arduino, Raspberry Pi, ESP32, ESP8266, PIC, AVR, STM32, and other microcontroller platforms, making it a popular choice for both beginners and experienced developers.

The HC-05 Bluetooth Module is commonly used in wireless serial communication projects, Arduino-based robot control, Bluetooth-enabled home automation systems, wireless sensor data transmission, RC vehicles, robotics, IoT applications, and STEM education projects.

Choosing the HC-05 means selecting a stable, affordable, and easy-to-configure Bluetooth solution. Its onboard button, dual operating modes, and wide compatibility make it an excellent option for building dependable wireless communication systems.