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


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Approx Restocking Date: 25 to 30 Days
SKU: 43647
  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 – Black. 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 millilitres.

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 is useful 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.

We have a variety of environmental sensors click here!

To know how to use water flow meter click here!


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

Features :

  1. The simple and compact module.
  2. Easy to Install.
  3. High Sealing Performance.
  4. High-Quality Hall Effect Sensor.

Package Includes :

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

Working Flow Rate (Liters/Minute)

1 ~ 30

Operating Temperature range (℃)

-25 ~ +80

Operating Humidity Range

35% – 80% RH



Maximum water pressure

2.0 MPa

Output duty cycle

50% +-10%

Output rise time (µsec)


Pulses per Liter


Output fall time (µsec)


Outer diameter (mm)


Intake diameter (mm)


Outlet diameter (mm)


Length (mm):


Width (mm):


Height (mm):


Weight (g):


Shipping Weight 0.089 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.  Reimbursement or 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.

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YF-S201 Datasheet

Example Arduino Code

Questions and answers of the customers

    can i get the data sheet of the flow meter
  1. 0 votes
    Q can i get the data sheet of the flow meter answer now
    Asked by amalanshus on November 3, 2023 9:42 pm

    Hello, for your query related to the datasheet ... Read more

  2. Can it be used to measure airflow
  3. 0 votes
    Q Can it be used to measure airflow answer now
    Asked by rajakumarsoe on October 5, 2023 11:54 am

    Its specifically designed to measure waterflow ... Read more

Only registered users are eligible to enter questions
Country Of Origin: China

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