This video describes how to use a BlueTooth module. br USB to TTL converter is used to connect the module to PC.A terminal software like PuTty is installed on PC to communicate with COM port. br A terminal software is also installed on the Android phone & 2 way communication is tested via the Bluetooth device. br HC05 module can act as Master as well as Slave module & is most preferred in Embedded projects. br br www.alselectro.wordpress.com br br www.alselectro.