Edit details The servo code was taken from commit 21b4532 on the grbl-1-1h-servo repository by @lavolpecheprogramma based on work by @DWiskow, who in turn probably got their ideas from the grbl-servo ...

Grbl is a no-compromise, high performance, low cost alternative to parallel-port-based motion control for CNC milling. This version of Grbl runs on an Arduino with a 328p processor (Uno, Duemilanove, ...