HC-05 Bluetooth Module

Pin Configuration:
1 Enable / Key
2 Vcc(+5V)
3 Ground
4 Tx(Transmitter)
5 Rx(Receiver)
6 State

For Completer Details checkout our Blog on HC-05 Bluetooth Module:
https://piees.blogspot.com/2018/07/led-onoff-using-hc-05-bluetooth-module.html