I am using an Arduino ADK with a motor control plugin (the thing with several pins that sits on top of the Arduino board), and I have the arduino connected to a PS3 controller via bluetooth. I am sure that that part is working properly. However, when I connect a battery to the plugin and then connect a DC motor on the other end, I find that the controller does not do anything. Further looking into it, I checked both ends with a meter. The battery was putting out 20.2 V, whereas the receiving end with the motor measured at 0. I have two of the boards and it is doing it on both of them. Did I not do something that I should have? Any help at all would be appreciated, as I need to get this working for a robotics competition in a few months. Thanks.