But, if I have something connected that uses a lot of power, using an external suply, and this PSU breaks, the arduino will be using the usb suply, and I could break my mother board... Am I right?
Maybe I should leave the arduino being suplied through the usb and suply the other board (the one with the shift registers) through the external PSU, and then just connect the grounds on the usb and on the external psu?
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