This android application can establish a connection with any Arduino/microcontroller project that involves a bluetooth module! It allows the user to set a UUID of his own bluetooth module in order to connect the android application with his projects!!! The default UUID that comes with this application is for the HC-05 Wireless Serial 4 Pin Bluetooth RF Transceiver Module RS232. (If you use default UUID in order to pair the BT module with your smartphone for the first time, you will have to give a 4-digit password. This password is '1234'.)