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I had a very vague thought. I was wondering if I could I create a dual power supply using an Arduino uno and a nano. Can the ground terminals of both the boards be shorted and the 5 volt terminals be used as +5v and -5v . Is this possible? Would it damage the board??

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No, because both 5V terminals are +5V.

If both boards are powered by completely isolated power supplies then you could connect the +5V of one to GND on the other. One will then have all its signals and logic negative to your ground level, but normal compared to its own ground level. Managing it though and keeping things separate (no shared ground between two sets of peripherals, etc), would be tricky. And the moment you plug one into your computer the whole lot could go up in smoke.

  • I didn't quite understand. So are you saying that it is possible for me to get negative signals if I have somehow connect both the Arduino boards on different power supply and then connect the 5v pin of one board onto the ground pin of the other board and vice versa?? – user183710 Mar 1 at 19:18
  • Kind of. The ground of one will be 5v lower than the ground of the other. And the power supplies must be isolated. That is vitally important. – Majenko Mar 1 at 19:36

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