Hi all! I am having trouble wrapping my head around an issue with a 5 and 12 volt concurrent system. I have a breadboard with 5v and ground on one side and 12v and ground to the other. I have the Uno controlling the 8 relay module with the 12 volt powering 4 separate motors on 4 of the relays. No p…

Going Both Ways

MorganS August 29, 2016, 2:21am 13

Because you don't want to feed 12V into the Arduino pin when the device is on.

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