Hello everyone, I'm working on a revision of a project where I run a PID control loop on a modified Mega (USB socket desoldered and replaced with a 4pin header with only the D-, D+, and GND pins connected) with a custom shield. This shield connects a 12V DC source to the Ardunio's Vin pin. Curren…

USB issues with Arduino 2560Mega powered by external supply

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