[Frank Herrmann] had an interesting idea to turn a geared DC motor ... listen on the ‘stepper motor driver’ interface pins hooked up to the motion controller upstream. The Arduino source ...

So he started to wonder if he could skip the controller entirely and connect the stepper motor directly to the digital pins of an Arduino. Generally speaking this is a bad idea, but if you’re ...

Permanent magnet dc motors need a chunky inductor ... engineering was to do two things: get this controller and motor running again, and then add an electrically-safe interface to allow remote control ...