Comment on Your move
are there microphones in vape pens now?
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
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)
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 chinese chips. You have to admire the ingenuity of it
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
cypherpunks@lemmy.ml 3 weeks 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 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)
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
tetris11@feddit.uk 3 weeks ago
Yep, cheap chinese chips. You have to admire the ingenuity of it