I am new to the forums. Also, I have looked through a few (if not all of them it seems), to find an answer.
Currently, I have an Arduino Uno and an Arduino Motor Shield. They have been working like a charm for about a week. The code worked perfectly to move my rover 5. However, when I went to turn it on, the greeen (ON) led was off.
Here is the problem when the Uno and Shield are attached.
If they are both attached, the ON led will be on and the code works. If I remove the USB, (7.2V battery for the motor board and 9V battery plug for the Uno are still attached) it will NOT work.
it seems it only works if the USB is plugged in---OR--- the motor shield is not attached
basically, if the motor shield and Uno are NOT attached, the Uno works . if they are attached, they only work with the USB
THANK YOU IN ADVANCE!!!