grbl is stepper motor controller firmware for three-axis cnc machines, intended to run on Arduinos with a motor driver add-on board. Engineer in Wonderland cnc-related blogs are indexed here It is the ...

So what’s the trick to running a whopping seventeen individual stepper motors directly from the digital pins of an Arduino Mega?

Controlling the motors is done through [Guy Carpenter]’s Switec X25 library for the Arduino, allowing an Arduino Uno to control up to three stepper motor gauges simultaneously.