Ventilator venturi flow meters
thingiverse
Venturi flow meters are essential for our ventilator design: https://github.com/Crowdsourced-Ventilator-Covid-19/crowdsourced-ventilator-covid-19/blob/master/README.md. A YouTube video explains it in detail: https://youtu.be/UG0DDkqZ9kk. The 3-barb Venturi is used to measure inspiratory flow and patient pressure, while the 2-barb Venturi measures expiratory flow. Pairing this setup with a differential pressure sensor (https://store.ncd.io/product/ams5915-0100-d-amplified-low-pressure-sensor-0-100-mbar-0-to-1-450-psi-i2c-mini-module/) allows us to measure volumetric flow up to 85 liters per minute. To assemble the Venturi flow meters, print them vertically with the barbs facing upwards.
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