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 ...

It allows you to simulate analog circuits, LCDs, stepper and servo motors ... of buttons above the rightmost pane. This is a code editor and debugging window that can interface with the Arduino ...

[Simon Merrett] ran into exactly this while testing different stepper motors in a strain-wave ... and zeroes it with a push of the button.