The Water Flow Measurement Sensor 1–30 LPM uses a hall effect paddle wheel inside a plastic housing to count liquid passing through a pipe. Every liter of water spins the wheel and generates exactly 450 pulses on the signal wire, giving you a precise digital count to work with rather than a drifting analog voltage. Operating on 5 to 18V DC, it covers a flow sensor yf s201 working range of 1 to 30 liters per minute and handles pipe pressures up to 2.0 MPa.
The output duty cycle is 50% ±10%, which means the pulse waveform is close to a square wave and reads cleanly on any interrupt pin. Flow rates near 1 LPM the pulse interval stretches to roughly 130 milliseconds, so a polling loop running slower than that will drop counts. Reading on a hardware interrupt instead of a loop fixes this completely. One trade-off is the ±10% accuracy rating, so this water folw sensor suits volume tracking and relay control in a water flow system rather than laboratory-grade measurement.
Maker building domestic water meters and making automated plant watering rig, engineers prototyping fluid control panels use the Water Flow Measurement Sensor. It works with the Arduino IDE, MicroPython, and any platform supporting external interrupts. StemVolt provides this sensor with trusted quality, ensuring reliable performance and easy usability.
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Features:
- Hall effect sensor type generates 450 pulses per liter giving a precise countable digital output
- Working flow rate of 1 to 30 LPM covers both low-drip and high-volume pipe measurement tasks
- Maximum water pressure of 2.0 MPa keeps the housing sealed on pressurised mains water pipe installations
Technical specifications:
| Specification | Details |
|---|---|
| Model | YF-S201 |
| Sensor Type | Hall Effect |
| Working Voltage | 5 to 18V DC (min tested working voltage 4.5V) |
| Working Flow Rate | 1 to 30 Liters/Minute |
| Working Temperature Range | -25 to +80℃ |
| Working Humidity Range | 35% – 80% RH |
| Accuracy | ±10% |
| Maximum Water Pressure | 2.0 MPa |
| Output Duty Cycle | 50% ±10% |
| Outer Diameter | Inner Diameter | 20mm | 0.5 Inch |
| Pulses per Liter | 450 per Liter |
Applications:
- A home water meter project uses the Water Flow Measurement Sensor 1–30 LPM to log daily consumption per tap
- An hot water recirculation system monitors water flow sensor yf s201 output to detect pump failure automatically
- A fish tank water change rig counts 450 pulses per liter and stops a pump at the exact target volume
Package includes:
- 1 x Water Flow Measurement Sensor 1–30 LPM
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