Mechaduino is a board that sits on a regular stepper motor and turns it into a servo with a closed loop control of 0.1degree ... they’ve promised. he Arduino-sounding bit of the name comes ...

control the motor rotation and listen on the ‘stepper motor driver’ interface pins hooked up to the motion controller upstream. The Arduino source for this can be found on the project GitHub.

grbl is stepper motor controller firmware for ... in this further EinW blog My small cnc mill project needs motors (so I am told) that are too powerful for the normal drivers included on grbl Arduino ...