Hall Effect Flow Sensor

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It is simply a magnet on a spinning wheel that passes by a Hall sensor - counting the number of pulses counts the rate of wheel spin - which is proportional to fluid flow.

This would be a great way to implement a return-side Arduino hydraulic flow meter! Printing with ABS (7000 PSI) can easily get us measurements on the return hydraulic side.

This would be a great way to create an Arduino-based logging flow meter.



  • 1/2" Adafruit - [1]
  • 1/4" Ebay - [2]
  • 1/2" Hong Kong - [3]