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Replying to @guidoism, @bigattichouse and @Bfreecomputers

ooh I know this one! @Adafruit did a teardown of a Philips Hue Tap, a battery-free Zigbee light switch that uses energy harvesting from a button press. And the answer is… likely not. Anything you could do in a millisecond or less though: maybe! https://www.youtube.com/watch?v=4T4nhuobjZM&t=1800s

(original)