HC-05 Bluetooth module

Add wireless Bluetooth serial communication to your Arduino or microcontroller project with this HC-05 module. It replaces wired serial connections, letting you communicate wirelessly with phones, computers, GPS modules, and other Bluetooth devices.

Configurable as either master or slave via AT commands, with a default baud rate of 9600 and pairing code 1234. The onboard LED indicates connection status.

Key Features

• Bluetooth 2.0 – Classic Bluetooth with CSR chip
• Master or Slave Mode – Configurable via AT commands
• Serial Replacement – Wireless UART communication
• 10m Range – Class 2 Bluetooth
• Wide Baud Range – 4800 to 1,382,400 bps
• Low Power – 8mA when connected
• Onboard Regulator – 3.3V LDO included
• Status LED – Visual connection indicator

Specifications

• Bluetooth – v2.0 + EDR
• Frequency – 2.4GHz ISM band
• Operating Voltage – 3.3V (2.7V–4.2V)
• Current – 35mA pairing, 8mA connected
• TX Power – +6 dBm
• Sensitivity – -85 dBm
• Default Baud – 9600
• Default PIN – 1234
• Dimensions – 37mm × 15mm

Pinout

• STATE – Connection status
• RXD – Serial receive
• TXD – Serial transmit
• GND – Ground
• VCC – Power (3.3V–4.2V)
• EN – Enable pin

Ideal For

• Arduino wireless serial projects
• Bluetooth remote control
• Wireless data logging
• Phone-to-microcontroller communication

Package Contents

• 1× HC-05 Bluetooth module