Solved: see post #5:
https://www.picbasic.co.uk/forum/sho...426#post156426
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This works fine if I press it for nearly 1 second.
But the LCDs display garbage if I press it quickly.
I was hoping to get away from using a 555 timer and an inverter to trigger the mosfet.
(yes, I had both ICs wired, and then I took it apart thinking I had found a shortcut, which isn't working as well as expected)
EDIT: This guy just gave me an idea to try:
https://electronics.stackexchange.com/a/322184
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