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[–] 5 points 6 days ago* (5 children)
  • [–] 7 points 6 days ago (4 children)

    Yep! The heating coil voltage should only start ramping up when the user is inhaling, and how do you detect that they're inhaling?

    With a friggin microphone! The negative air pulls the drum up and that's enough to send a signal to the MCU

    You can see some examples here

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  • [–] 4 points 6 days ago (1 child)

    You can see some examples here

    oh i see, that one doesn't have a microphone but rather three microphones 🤯

    (previously via hackaday i saw someone turn a disposable vape into a webserver but the use of microphones in them is news to me, thanks)

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  • [–] 4 points 6 days ago (1 child)

    Why don't they do what MAF sensors in cars do? I.e. measure how fast a warm wire cools, which directly tells you how many molecules are hitting that wire and therefore how fast air is flowing past it?

    I'm guessing it's because microphones are cheap

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