Description

Specification Details
Model HC-05 with 6-pin breakout board
Bluetooth standard Classic Bluetooth v2.0 + EDR; not BLE
Communication profile Serial Port Profile (SPP)
Wireless frequency 2.4 GHz ISM band
Operating modes Master or slave, configurable through AT commands
Communication interface TTL UART — TXD and RXD
Breakout-board supply Typically 3.6–6 V DC; commonly powered from 5 V
Signal voltage 3.3 V logic
Communication range Typically around 10 m; depends on surroundings
RF transmit power Up to +4 dBm for the reference HC-05 design
UART baud rates Configurable; reference firmware supports 9,600–460,800 baud
Default data-mode baud Commonly 9,600 baud; firmware-dependent
AT-command baud Commonly 38,400 baud
Serial format Typically 8 data bits, no parity, 1 stop bit
Pairing PIN Commonly 1234 or 0000; configurable
Antenna Integrated PCB antenna
Onboard features Voltage regulator, status LED and AT-mode pushbutton
Applications Wireless robot control, sensor data transmission, home automation and serial cable replacement