Can I force Arduino Not to be powered by USB? – arduino.stackexchange.com

Can I force Arduino Not to be powered by USB? – arduino.stackexchange.com

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I'm building a 3D printer and I'm using a Atmega2560 + RAMPS board. The whole thing is powered by an ATX PSU (12v for motors and stuff, 5v for the Arduino), but when I plug in my USB cable, I can't ...

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