HC06 Wireless Bluetooth Module

The HC06 is a class 2 slave Bluetooth module designed for transparent wireless serial communication. Once it is paired to a master Bluetooth device such as PC, smart phones and tablet, its operation becomes transparent to the user. All data received through the serial input is immediately transmitted over the air. When the module receives wireless data, it is sent out through the serial interface exactly at it is received. No user code specific to the Bluetooth module is needed at all in the user microcontroller program.

The HC-06 will work with supply voltage of 3.6VDC to 6VDC, however, the logic level of RXD pin is 3.3V and is not 5V tolerant. A Logic Level Converter is recommended to protect the sensor if connect it to a 5V device (e.g Arduino Uno and Mega).

NOTE: This module does not support AT command.

Specifications :

• Bluetooth v2.0+EDR
• 2.4GHz ISM band frequency
• Default baudrate: 9600
• Power supply: 3.6V to 6V DC
• Passkey: 1234

Wiring a HC-06 to an Arduino

VCC – 5v

GND – GND

TXD – Pin 0 (RX)

Please note: While the HC-06 will tolerate 5V power, the RXD pin can only handle 3.3V. As the Arduino pins use 5V logic, wiring directly from the Arduino’s output pins to the HC-06 may damage the Bluetooth controller.

In order to keep the voltage at safe levels, use a potential divider to connect the RDX pin to the Arduino’s TX pin (Digital Pin 1).