grbl is stepper motor controller ... that are too powerful for the normal drivers included on grbl Arduino shields (or integrated Arduino+drivers equivalents), and so I have been considering designing ...

He was able to get it running with an Arduino in no time so he decided to take the project a little bit further. What he ended up with is a stepper motor driver which can be controlled over Bluetooth.

Leveraging the Trinamic TMC2208 stepper motor driver gives Ethersweep silky smooth ... the ubiquitous ATMega328 microcontroller, with the Arduino software stack deployed, making uploading firmware ...