HC-05 Bluetooth Module

The HC-05 Bluetooth Module is a versatile and widely-used serial Bluetooth communication module designed for wireless data transmission between microcontrollers, PCs, and mobile devices. It supports Bluetooth 2.0 + EDR and can operate in Master or Slave mode, making it ideal for a wide range of electronics, robotics, and IoT projects.

With simple UART serial communication, the HC-05 allows easy integration with platforms such as Arduino Uno, ESP32, and Raspberry Pi, enabling wireless control, data logging, and device communication without complex networking.

Key Features

• Bluetooth 2.0 + EDR for stable wireless communication

• Can operate in Master or Slave mode

• Supports serial UART communication for easy integration

• Low power consumption and compact form factor

• Compatible with microcontrollers and embedded devices

• Simple AT command setup for configuration

Specifications

• Operating Voltage: 3.3V – 5V

• Communication Interface: UART (TX, RX)

• Default Baud Rate: 9600 bps (configurable)

• Transmission Range: Up to 10 meters (line-of-sight)

• LED Indicator: Status signal for power and connection

• Dimensions: Approx. 36 mm × 15 mm

Pin Description

• VCC: Power supply (3.3–5V)

• GND: Ground

• TXD: Serial data output

• RXD: Serial data input

• STATE: Connection status indicator

• EN/KEY: Module configuration pin