The “YFS201 Hall Effect Water Flow Sensor” comes with three wires: Red/VCC (5-24V DC Input), Black/GND (0V) and Yellow/OUT (Pulse Output). By counting the pulses from the output of the sensor, we can ...

A low-voltage electronic circuit that senses ... 4 V is produced at the inverting input of the U2C and U2D op amps. When the water is below level A, the sensors are both open circuits and the ...

If you’d like to get some hard data on your water usage, have a look at [Josh EJ]’s Sensible Flow project. It contains designs for a set of sensors ... with detailed circuit diagrams that ...