for quite some time now I've been trying to get my android app to communicate with my arduino mega ADK controller. What the app should do is simple: when I press "ON" on the application a motor should start turning. But I can't figure out how to send the signal (or code). I'm trying with a usb-cable, I know it's possible with bluetooth but that's not really an option.
Does anyone have any ideas or tips?
Thanks in advance