상황
A battery-powered Arduino Nano project needs a soft latching power switch to conserve power and avoid the need for a mechanical switch.
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01
Using a MAX16054 IC for debounced push-button on/off control.
02
Using a P-channel MOSFET as a high-side switch to minimize voltage drop.
03
Adding a pull-up resistor to keep the MOSFET off when the controller output is high-impedance.
When designing battery-operated devices that need a low-power standby state and a simple user interface with a single button.