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  1. K

    Detect 5v button push on separate system

    On the list of "cost effective methods", do you see any issues with using an photocoupler like this? Where the 5v side would power the LED/emitter, and that would close the collector circuit on the 3.3v side completing the grounding...
  2. K

    Detect 5v button push on separate system

    The preferred solution would latch on 5V signal but can make it work on low/ground signal as well.
  3. K

    Detect 5v button push on separate system

    Thanks for this idea, I ordered an SSR to test with, looks like it should work for this problem as well.
  4. K

    Detect 5v button push on separate system

    Thanks for the help and descriptions. I will tinker a little more and see what works.
  5. K

    Detect 5v button push on separate system

    I think so, circuit A with the 5v button is the system we are monitoring, and when that button presses we want to ground or pull to zero a trigger on a different system. The trigger on system B can be set to look for a high (3.3v) or low (grounded) condition to trigger, the default is grounded...
  6. K

    Detect 5v button push on separate system

    Thank you, I will give this a try!
  7. K

    Detect 5v button push on separate system

    I need to detect a 5v button press (single wire in/out on the button) on an alternative system, and close/ground a 3.3v circuit on the local system when that 5v button is pressed on the separate system. I am sure this is super basic but I am stumped, any help is greatly appreciated. System A...
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