Program to Control LED by Bluetooth HC-05 Module Attach the Bluetooth Module and Upload the Program to the Board Download the Bluetooth Serial Controller 16 App from Google Play Store on your Mobile.(Only available for Android Devices) After opening press on Continue Click on PREFERENCE Click on Visibility In Visibility Uncheck buttons from 3 to 16 ( We use only two buttons for ON/OFF ) Go back and press on Name Click on Button 1 Name it as ON Click on Button 2 and Name it as OFF Go Back and press on Command Click on Button 1 Give value as 1 Now click on Button 2 and give value as 0 Now open Bluetooth in Settings of your Device and search for Bluetooth Module Once Bluetooth Module appears click on it and give password as 1234 and click on Pair Now open Bluetooth Serial Controller 16 app and Click on CONNECT. Now select your Device the Status in the left side of your app changes to connected. Once Connected you can control the LED from Your Mobile Phone using the ON/OFF Button in the Bluetooh Serial Controller 16 App.