THIS LIBRARY IS KEPT FOR REFERENCE. THE OFFICIAL LIBRARY IS HOSTED AT : https://github.com/gnea/grbl
Arduino Library for GRBL - This way you can use the Arduino IDE to upload GRBL to your Arduino Board.
Down load the library from GitHub : https://github.com/Protoneer/GRBL-Arduino-Library/archive/master.zip
Unzip the library and copy the main folder into the “Libraries” folder in the folder you installed your Arduino software. Eg. C:\arduino-1.0.3\libraries\
Rename the folder to “GRBL”. (This will stop the Arduino IDE from complaining about the long folder name)
Open up the Arduino IDE.
Click on the following menu : File -> Examples – > GRBL (or what ever you renamed the folder to) -> ArduinoUno
Upload the sketch to your Arduino board.