GitHub - sekdiy/FlowMeter: Arduino flow meter library that provides calibrated liquid flow and volume measurement with flow sensors.
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DIGITEN G1/4" Water Flow Sensor, Food-Grade Hall Effect Sensor Flow Meter Flowmeter Counter Connect Hose 0.3-6L/min - Arduino, Raspberry Pi, and Reverse Osmosis Filter Compatible: Amazon.com: Industrial & Scientific
![How to Make an Accurate Air Flow Rate Sensor With Arduino for Under £20 COVID-19 Ventilator : 7 Steps - Instructables How to Make an Accurate Air Flow Rate Sensor With Arduino for Under £20 COVID-19 Ventilator : 7 Steps - Instructables](https://content.instructables.com/F20/0CCE/K9XCVJQ7/F200CCEK9XCVJQ7.jpg?auto=webp&fit=bounds&frame=1&height=1024&width=1024auto=webp&frame=1&height=150)