IoT Projects
Measured Irrigation with Flow Meter
Water a garden bed by the litre using a flow sensor and solenoid valve.
Overview
The YF-N20 sends a pulse per volume of water. The board counts pulses and closes the valve once the target volume has passed, so beds get even water without waste.
Build Steps
Plumb the sensor
Fit the flow sensor and valve in series on the supply line with the arrow pointing toward the bed.
Count the pulses
Read the hall-effect pulses on an interrupt pin and multiply by the sensor's calibration factor for litres.
Control the valve
Open the relay, count to the target volume, then close; confirm no leaks at the fittings.
Tune per bed
Run a measured bucket test to calibrate, then set litres per bed for each watering cycle.