DRV8825 compatible servo control for CNC shield with Digispark Arduino

This project is intended to provide a simple solution for using servos with CNC and plotter projects based on GRBL Arduino firmware (and CNC shield). Of course it is possible to use a modified GRBL firmware and drive the servo directly from the main Arduino. However, this requires specialized firmware and often specific Gcode instructions.

This project strives to use a Digispark (Attiny85) to imitate the DRV8825 stepper drivers to control the servo. This way you can use generic Gcode and the