• tetris11@feddit.uk
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      24 hours ago

      Take apart their vape pens for the flashable MCUs, microphones, decent battery, and sweet magnets, and then bounce

        • tetris11@feddit.uk
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          19 hours 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

          • glibg10b@lemmy.zip
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            19 hours 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

            • tetris11@feddit.uk
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              18 hours ago

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

            • tetris11@feddit.uk
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              18 hours 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)