Comment on Your move

• cypherpunks@lemmy.ml ⁨3⁩ ⁨weeks⁩ ago

  are there microphones in vape pens now?

  source

  • tetris11@feddit.uk ⁨3⁩ ⁨weeks⁩ ago

    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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    • cypherpunks@lemmy.ml ⁨3⁩ ⁨weeks⁩ ago

      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)

      source

      • tetris11@feddit.uk ⁨3⁩ ⁨weeks⁩ ago

        Yep, lucky bastard got PUYA chip with a readily available flasher! Best I’ve gotten is an SC8 chip with maybe a UART (I’m still probing the pins)

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    • glibg10b@lemmy.zip ⁨3⁩ ⁨weeks⁩ ago

      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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      • tetris11@feddit.uk ⁨3⁩ ⁨weeks⁩ ago

        Yep, cheap chinese chips. You have to admire the ingenuity of it

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