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On one board I have a microcontroller with one power supply and on another I have a Flip Flop with a separate power supply. I want to connect a pin of the microcontroller to the reset pin of the flip flop. Can I just put a wire accross or does it need more than that? I was going to do that but now I’m not sure that would work because it wouldn’t be a complete circuit and the two boards may not have quite the same ground levels.
If for some reason you can’t have a common ground, you could look into optoisolators.