I would like to send a HIGH signal down a pin to a switch and totally shut off power to my entire project.
Other way around - use P-channel MOSFET as high side switch with pullup on the gate to hold it off.Press a button to pull the gate low & turn on the power, Arduino comes alive & holds it low to keep power available. When done, release the gate & MOSFET gets turned off, power goes away.
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