I have an Arduino Duemilanove with ladyada motorshield on.
It works fine to control a very small DC motor I got from a racetrack toy car.
I am now trying to control the DC motor from a printer (not stepper).
I don't have the specs from the motor, but if I give it 13V from a (12V
) power supply I built (instructables.com/id/How-to-Build-a-Bench-Top-Power-Supply/)it runs slowly but smoothly.
I now want to control it from my Arduino, so I connect the power supply to the EXT PWR block on the shield and set it at the same 13V.
I can then hear a buzz coming from the motor. The buzz follows the commands I setup in Arduino-0014, so I guess the power reaches the motor, so why isn't it moving? Since it does work directly from the power supply, why won't it from Arduino with the same voltage?