[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 ...

grbl is stepper motor controller firmware for three-axis cnc machines ... that are too powerful for the normal drivers included on grbl Arduino shields (or integrated Arduino+drivers equivalents), and ...

The solution is named Ethersweep, and is a small PCB stack that sits on the rear of the common NEMA17-format stepper motor ... with the Arduino software stack deployed, making uploading firmware ...

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 ...