I have the motor shield on top of the ethernet shield on the Mega 2560, All purchased form adafruit. Two questions:1) Will stacking shields potentially cause any problems? And if so, how do I fix them.
2) How do I connect an external power supply to the motor shield? Will whatever supply I hook up, also be the voltage that the motors will receive? I am using four of these small 4.5-9V hobby motors (https://www.adafruit.com/products/711)Do I just cut off the end of the 9V power supplies and hook them up? How do I determine which one is ground? (novice question, sorry)I appreciate any insight