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Bench NotesUno handbook

Troubleshooting

Upload failures and a method for finding faults.

Debugging Arduino Sketches
A repeatable process for finding faults: switchable debug prints, a heartbeat LED and checks with a meter.
IntermediateSerialLED
Fixing Upload Errors
Work through the usual causes when the IDE cannot upload: port, board, cable, drivers and pins 0/1.
BeginnerArduino Uno