grbl-servo can be used on Arduino to control an X-Y pen plotter, where the pen is operated by a small servo motor such as an SG90 micro servo. Grbl is a no-compromise, high performance, low cost ...

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, ...