I use this to control some LED strip lights with a pushbutton switch, but it could be used with other loads like a fan, too. The pushbutton is debounced in software, and the code detects short versus long button presses. Uses a low-voltage relay (to control the v+ connection on the load) and optionally a MOSFET (to control the v- connection on the load, via PWM).
lawtalker/Pushbutton_Switch
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