Electronics > Projects, Designs, and Technical Stuff
Sprint Day 2: What developing world substitutions are there for flow meters?
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ArthurDent:
Dave, That video was a great overview that explains in layperson terms what would actually be required to build a ventilator that actually works. There is also the short-term reliability, life expectancy of the unit, and the whole legal side to consider. Bottom line is this isn't a sprint of days but a long-term expensive project well beyond my, or most people's abilities, and wallet.
EEVblog:

--- Quote from: ArthurDent on April 05, 2020, 03:06:47 am ---Dave, That video was a great overview that explains in layperson terms what would actually be required to build a ventilator that actually works. There is also the short-term reliability, life expectancy of the unit, and the whole legal side to consider. Bottom line is this isn't a sprint of days but a long-term expensive project well beyond my, or most people's abilities, and wallet.

--- End quote ---

Yes, I think almost all of these hack rapid development projects, as well intentioned as they are, will not amount to a usable product.
thatguy1988:
Adafruit sell some very cheap flow meters. Amazon do as well but they don't ship them to all countries.

https://www.adafruit.com/product/833

https://www.adafruit.com/product/828
Simon:
Those are both liquid flow meters. If they are useful your patient is already dead!
Simon:
The easiest thing to "make", "cheap" is a slight restriction in your tube with a very sensitive differential pressure sensor either side that has a log output. This counteracts the exponential characteristic of the restriction that follows a square law to give a linear output to flow. It would need characterizing. You can get a 125 Pa sensor for 10's of pounds.
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