HC 05 Bluetooth 2.0 - parasquid/mcu-iot-sensors GitHub Wiki

• https://www.itead.cc/wiki/Serial_Port_Bluetooth_Module_(Master/Slave)_:_HC-05
• https://www.itead.cc/serial-port-bluetooth-module-master-slave-hc-05.html
• http://fab.cba.mit.edu/classes/863.15/doc/tutorials/programming/bluetooth/bluetooth40_en.pdf

How to activate AT mode (command state):

1. Connect PIO11 to high level. (push and hold down the button near EN)
2. Power on, module into command state.