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HC-05 Wireless Bluetooth

Power supply: 6V – 4.5V
The default baud rate: 9600 can be modified according to the datasheet
Support connect Android phones with Bluetooth

Note: This module does not suitable for IOS system.


Pin serial port descriptions:

PIO8 connect LED, indicates the status of working, after powered the module flashing, different states in different flashing intervals.
PIO9 connect LED, indicates successful connecting module, after successful mating Bluetooth serial port, LED long lights.
PIO11 state switch pin (high level) -> AT command response to the work state, low level or dangling -> Bluetooth regular work status.
On module with a reset circuit, re-power to complete the reset.

Main module setup steps:

1. PIO11 set high.
2. Power ON, the module into the AT command response status.
3. HyperTerminal or other serial tools set the baud rate 38400, 8 data bits, 1 stop bit, no parity, no flow control.
4. Serial send characters “AT + ROLE = 1 r n”, successful return “OK r n”, which r n for carriage return.
5. PIO set low, re-power, module as the main module, automatic search from module to establish a connection.

Package included:

5 x HC-05 Wireless Bluetooth Serial Module


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