Bluetooth HC-05 Module for Arduino | Wireless Serial

Bluetooth HC-05 Module

The HC-05 Bluetooth Module is a popular wireless communication module designed to add Bluetooth functionality to Arduino, microcontrollers, robotics, and automation projects. It uses Bluetooth 2.0 + EDR technology and communicates through UART (TX/RX) serial interface. It can work in both Master and Slave modes, making it highly flexible for various wireless applications.

The module allows easy wireless data transfer between a microcontroller and Bluetooth-enabled devices such as Android smartphones, computers, and other HC-05 modules. It supports AT commands for changing settings like device name, baud rate, and operating mode.

Features

• Bluetooth 2.0 + EDR technology
• Supports UART serial communication
• Operates in Master and Slave modes
• Compatible with Arduino, AVR, PIC, ESP32, and other microcontrollers
• Default baud rate: 9600 bps (Data Mode)
• AT Command mode for configuration
• Communication range up to approximately 10 meters in open space
• Low power consumption
• Easy 6-pin interface with VCC, GND, TX, RX, KEY/EN, and STATE pins

Technical Specifications

Pin Description

• VCC – Power supply input (5V recommended)
• GND – Ground connection
• TXD – Transmits serial data from HC-05
• RXD – Receives serial data to HC-05
• KEY/EN – Used to enter AT command mode
• STATE – Indicates Bluetooth connection status

Applications

• Arduino wireless communication
• Bluetooth controlled robots and RC cars
• Home automation systems
• Wireless sensor monitoring
• Smart devices and IoT projects
• Data logging and serial communication

Package Includes

• 1 × HC-05 Bluetooth Wireless Serial Module