Roommate let me disassemble the old busted humidifier and I'm currently determining how best to turn it into an ultrasonic cleaner
...Well, that's remarkably easier to shortcut than I anticipated.
short the potentiometer, short the water sensor, add a switch, bob's your uncle
I can even make a cute little case for it when my ABS-like resin arrives :D
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short the potentiometer, short the water sensor, add a switch, bob's your uncle