Install GRBL On Arduino Uno

After this Install UGS On Pi4

Windows Pre Cursor Steps

1. Download and install Arduino IDE 2.3.2 from https://www.arduino.cc/en/software
2. Download as GRBL 1.1h from https://github.com/gnea/grbl/releases/tag/v1.1h.20190825, I used the link just says Source code(zip)
3. Extract grbl-1.1h.20190825.zip to grbl-1.1h.20190825
4. Copy grbl-1.1h.20190825\grbl-1.1h.20190825\grbl to the root of your downloads as grbl
5. Zip grbl as grbl.zip

Add GRBL to Arduino IDE

1. Open Arduino IDE
2. Select Sketch -> Include Library -> Add .ZIP Library
3. Navigate and select grbl.zip
4. GRBL now appears under File -> Examples

Burn GRBL to Arduino UNO

1. Plug the Arduino into the PC
2. Select Select Board -> Unknown Com3
3. Search for UNO and select Arduino Uno and select OK
4. Select File -> Examples -> grbl -> grblUpload

This opens a new instance of Arduino IDE with grblUpload.ino selected

5. Select Sketch -> Upload

This will flash GRBL to the Arduino UNO