![]() I'm just not sure about connecting 5V directly to ground though. That would go to the collector of the transistor in the opto-coupler (pin 5 in this particular case). You need to identify by measuring with a meter which pin has the positive voltage on it. I wasn't sure what voltages would be on them, or if there would be a spike, so I used an opto-coupler like this: In the same way as you describe, two pins had to be shorted. I had a project a while ago where I wanted to trigger a camera flash. The Vin pin could easily be up around the 10V mark, depending on what you plug into the barrel jack. I certainly would not be using it as a 5V "virtual ground" - whatever that means. Is this an okay use without damaging it? I have a camera which triggers when two wires coming from it are connected, so it triggers on a short At the moment I am using it as a sort of 5V "virtual ground". ![]()
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