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 20 hours agoYep! 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 19 hours ago
tetris11@feddit.uk 19 hours ago
Yep, cheap chinese chips. You have to admire the ingenuity of it
cypherpunks@lemmy.ml 19 hours ago
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)
tetris11@feddit.uk 19 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)