YF-S201 Water Flow Measurement Sensor with 1-30Liter/min Flow Rate – White


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Approx Restocking Date: 25 to 30 Days
SKU: 12219
  1. Working Voltage: 5 to 18V DC (min tested working voltage 4.5V).
  2. Max current draw: 15mA @ 5V.
  3. Working Flow Rate: 1 to 30 Liters/Minute.
  4. Maximum water pressure: 2.0 MPa.
  5. Flow rate pulse characteristics: Frequency (Hz) = 7.5 * Flow rate (L/min).


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Category: Water TDS, pH, Flow, Level and Pressure Sensor
Tags: Water Flow Sensor, Flow Measurement, Flow Detection, YF-S201, Flow Sensor

This is YF-S201 Water Flow Measurement Sensor with 1-30Liter/min Flow Rate white sensor. This sensor sits in line with your water line and contains a pinwheel sensor to measure how much liquid has moved through it. There’s an integrated magnetic hall effect sensor that outputs an electrical pulse with every revolution. The hall effect sensor is sealed from the water pipe and allows the sensor to stay safe and dry.

By counting the pulses from the output of the sensor, you can easily calculate water flow. Each pulse is approximately 2.25 milliliters.

Note this isn’t a precision sensor, and the pulse rate does vary a bit depending on the flow rate, fluid pressure, and sensor orientation. It will need careful calibration if better than 10% precision is required. However, it’s great for basic measurement tasks!

We have an example Arduino sketch(check the ATTACHMENTS tab) that can be used to quickly test the sensor, it will calculate the approximate flow of water in liters/hour. The pulse signal is a simple square wave so it’s quite easy to log and convert into liters per minute using the following formula.


Red wire: +5V.
Black wire: GND.
Yellow wire: PWM output.

Features :

  1. 1/2″ nominal pipe connections, 0.78″ outer diameter, 1/2″ of thread.
  2. The simple and compact module.
  3. Easy to Install.
  4. High Sealing Performance.
  5. High-Quality Hall Effect Sensor.

Package Includes :

1 x YF-S201 Water Flow Measurement Sensor with 1-30Liter/min Flow Rate.


Max current draw

15mA @ 5V

Working Flow Rate

1 to 30 Liters/Minute

Operating Temperature (°C)

-25 ~ +80

Humidity measuring range

35% – 80% RH

Maximum water pressure

2.0 MPa

Output duty cycle

50% ±10%

Output rise time (µsec)


Pulses per Liter


Cable length (cm)


Outer diameter (mm)


Inlet/Outlet diameter (mm)


Length (mm):


Width (mm):


Height (mm):


Weight (g):


Shipping Weight 0.1 kg
Shipping Dimensions 9 × 6 × 6 cm
15 Days Warranty

This item is covered with a standard warranty of 15 days from the time of delivery against manufacturing defects only. This warranty is given for the benefit of Robu customers from any kind of manufacturing defects. Replacement will be done against manufacturing defects.

What voids warranty:

If the product is subject to misuse, tampering, static discharge, accident, water or fire damage, use of chemicals & soldered or altered in any way.

YF-S201 Datasheet

Example Arduino Code

Questions and answers of the customers

    What is the correct Calibration Factor for this pr... Read more
  1. 0 votes
    Q What is the correct Calibration Factor for this product to measure water reading? With 7.5 it giv...... Read more answer now
    Asked by gomap.solutionz on December 24, 2019 12:25 pm
    A first, you'll have to pass known values in-order t... Read more
Only registered users are eligible to enter questions
Country Of Origin: China

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