GitHub - Protoneer/GRBL-Arduino-Library: Arduino Library for GRBL - With this Library you can use the Arduino IDE to upload GRBL to your Arduino Board. (More details at the bottom of this page)
Setting up GRBL on Arduino UNO along CNCJS - Hackster.io
Arduino-CNC-Shield-Schematics | Protoneer.co.nz
DIY Arduino Uno CNC Plotter Machine Project with Code and Circuit Diagram