YF-S201 Water Flow Hall Sensor
by Generic
SKU: PSA-CMP-FLOW
No reviews yetTypical India street price
₹120–₹250
Turbine + Hall pulses — litres for science and IoT taps.
Interface: Digital pulse (Hall)
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Concept
Flow spins a magnet; Hall switch outputs a frequency proportional to flow.
A little theory
YF-S201 ≈ 7.5 Q (L/min) pulses per second (datasheet factor). Integrate pulses → volume. In the classroom, treat YF-S201 Water Flow Hall Sensor as a intermediate part using Digital pulse (Hall). Typical India street price is about ₹120–₹250. Always verify voltage and pin labels on your exact module — silk screens vary across clones. Start with a datasheet or trusted learn guide, power the part correctly, share GND with the MCU, and test with a simple blink/read sketch before building the full project. Measure voltages with a multimeter when something fails, and keep actuator current off the MCU regulator.
How it works in a project
Interrupt on RISING, count, convert with calibrated factor.
Classroom & project use
- Smart tap
- Irrigation volume
- Physics flow labs
Buying in India
Precautions
- Check 3.3 V MCU compatibility before connecting signal pins
- Share a common GND with the microcontroller
Specifications
| Model | YF-S201 |
| Output | Pulse |
| Category | Sensors |
| Difficulty | Intermediate |
| Voltage | 5V |
| Interface | Digital pulse (Hall) |
Pinout
See module silkscreen: typically VCC, GND, and signal pins. Confirm labels against the seller photo — clones vary.
