HC-05 Bluetooth Module

The HC-05 Bluetooth Module is a popular and reliable wireless communication device used in embedded systems, robotics, and IoT projects. It operates using the Bluetooth 2.0 + EDR (Enhanced Data Rate) protocol and provides a simple way to enable wireless serial communication between microcontrollers and other Bluetooth-enabled devices such as smartphones, laptops, and tablets.

The module communicates through UART (Serial Communication), making it easy to interface with development boards like Arduino, PIC, AVR, Raspberry Pi, and other microcontrollers. One of its key features is the ability to work in both Master and Slave modes, allowing it to either initiate or receive connections depending on the application.

The HC-05 module typically operates at 3.3V logic level and can be powered with 3.6V–6V input, thanks to its onboard voltage regulator. It also includes status LEDs that indicate pairing and communication activity.

This module is widely used in projects such as wireless robot control, home automation systems, smart devices, data logging systems, and IoT communication setups. Its ease of use, stable performance, and compatibility with many development platforms make it one of the most popular Bluetooth modules for electronics hobbyists, students, and developers.