Bluetooth module, JY-MCU.

Hi, i make device who can turn on or turn off led, its ok with that, but i dont understand one thing, it is codes what are received. Received codes are A, a, B, b i dont understand what that codes is really are? How android apps can send letters with bluetooth…?

Received codes are A, a, B, b i dont understand what that codes is really are?

Where is the code that understand these code?

How android apps can send letters with bluetooth...?

Perhaps your local Ford dealer can help you with that.

I’m not sure what you want but here is some stuff on Arduino<>Android via bluetooth to get you started.

http://homepages.ihug.com.au/~npyner/Arduino/GUIDE_2BT.pdf

http://homepages.ihug.com.au/~npyner/Arduino/BT2way.ino