The project uses an Arduino pro mini , a bluetooth and a 4-channel relay board.
I made an app all by myself instead of using the readymade ones available on the playstore.
Just open the app,connect your phone's bluetooth to the bluetooth interfaced with arduino and then suddenly the status bar goes green from red. By clicking on the button, the app sends a character to the arduino via bluetooth. The arduino decodes it and performs what that character was coded to do.