I have made device to turn off and turn on lights via bluetooth using bluetooth HC-05 module. I made my deviceu sing PIC16f887 from pic programming. I've checked my device from blueterm app. When I send letter 'a' device cab turn-on led and sending the 'b' can turn off led. But Still I'm programming to develop my own android app. Can you give me a rough idea how can I send a character to the module via my app?