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    This is a really cool article and I’m learning a lot from-

    An interesting trick about LEDs is that they can also work backwards — when they receive light, they can also emit tiny bits of electricity.

    holy crap

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      I know, right? :D https://en.wikipedia.org/wiki/Photodiode

      Edit: For the peak of “If it’s dumb but it works it isn’t dumb”, https://en.wikipedia.org/wiki/Opto-isolator