ickplant@lemmy.world to Lemmy Shitpost@lemmy.world · 1 day agoYour movelemmy.worldimagemessage-square85fedilinkarrow-up1616arrow-down114
arrow-up1602arrow-down1imageYour movelemmy.worldickplant@lemmy.world to Lemmy Shitpost@lemmy.world · 1 day agomessage-square85fedilink
minus-squaretetris11@feddit.uklinkfedilinkEnglisharrow-up6·19 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
minus-squareglibg10b@lemmy.ziplinkfedilinkarrow-up4·19 hours agoWhy 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
minus-squaretetris11@feddit.uklinkfedilinkEnglisharrow-up3·edit-218 hours agoYep, cheap and cheerful chinese chips. You have to admire the resourceful ingenuity of it
minus-squareArthur Besse@lemmy.mllinkfedilinkEnglisharrow-up3arrow-down1·19 hours 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)
minus-squaretetris11@feddit.uklinkfedilinkEnglisharrow-up3·18 hours agoYep, 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)
microphones?
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
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
Yep, cheap and cheerful chinese chips. You have to admire the resourceful ingenuity of it
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)
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)