Vape sensors

A project log for COSV - Cam Open Source Ventilator

Cam based ventilator designed to fit directly on an BVM, on the patient.

Daren SchwenkeDaren Schwenke 03/25/2020 at 16:300 Comments

Did an experiment a few days ago.  Gutted a vape and stole the sensor.

Applied 3.3v and ground to the appropriate two pins to match the setup in the vape. Given it runs directly from the battery this is probably a 2.6-5v device.

The signal pin went from 0 to Vcc on inhale.

I don't know if this is an analog or a digital signal, but I will find out today.  

If it is analog, it is going rail to rail with < 0.3 psi of input.  I am hoping it is...

If it is an analog device, two of them sealed side by side, facing opposite with a voltage divider on the output pin would give me a sensor capable of -0.3 psi to 0.3psi.  That is what I need to measure the flow using my pitot tubes.

<EDIT> Um.. that would suck as my output would be centered around 0v and go down to -Vcc.  Just reading them both as to ADC inputs would work though.  I did not get to testing if these are analog or digital yesterday.  Perhaps today. </EDIT>

Cross your fingers.