I have a sketch that only does I/O to Serial1 on the Leonardo and one LED if the Leonardo is plugged into a PC then the sketch runs without any real issues unplg it from USB port on computer and power by another power supply and communications between the Leonardo and another device break down T…

USB Serial on Leonardo is affecting a sketch

nickgammon October 15, 2012, 7:11am 2

I have 2 versions of the sketch

Sadly you haven't posted either sketch.

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