I am currently having trouble getting my motors to respond to inputs from my Arduino. I am following this lesson to setup my motors correctly: https://learn.adafruit.com/adafruit-arduino-lesson-13-dc-motors?view=all. The only variation with my setup is that I am using an external power supply instead of the 5V from the Arduino because my motors require more power than the Arduino can supply.
This is my setup: [http://i.imgur.com/0lVoy0X.jpg]http://i.imgur.com/0lVoy0X.jpg](http://)
The only thing I am writing to the motors in my program at the moment is analogWrite(motorPin, speed). I have not yet been able to test my PID controller because I cannot get the motors to respond at all. Anyone have any suggestions?