Buy YF-S201 Water Flow Sensor Online in India | Robocraze

Package Includes:

• 1 x Water Flow Sensor - YF-S201

Specifications

Model	YF-S201
Sensor Type	Hall effect
Working Voltage	5 to 18V DC
Working Flow Rate	1 to 30 Liters/Minute
Maximum water pressure	2.0 MPa
Output rise time	0.04us
Output rise time	0.04us
Output fall time	0.18us
Pulses per Liter	450
Frequency (Hz)	7.5 * Flow rate (L/min)
Compatibility	1/2" nominal pipe connections, 0.78" outer diameter, 1/2" of thread
Dimensions	2.5" x 1.4" x 1.4"
Weight	25 grams

• Datasheet

Arduino Sample Code

Use the following Arduino code to read the YF-S201 pulse output and calculate the water flow rate:

volatile unsigned long pulseCount = 0;

void countPulse() {
  pulseCount++;
}

void setup() {
  Serial.begin(9600);

  pinMode(2, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(2), countPulse, RISING);
}

void loop() {
  pulseCount = 0;

  delay(1000);

  float frequency = pulseCount;
  float flowRate = frequency / 7.5;

  Serial.print("Flow Rate: ");
  Serial.print(flowRate);
  Serial.println(" L/min");
}

1. How does a water flow sensor work?

• A water flow sensor is made up of a plastic valve that allows water to pass through. The flow of water is sensed and measured using a water rotor and a hall effect sensor. When water flows through the valve, the rotor rotates. As a result, the motor's speed can be changed. This change is calculated by the hall effect sensor and output as a pulse signal. The flow rate of water can thus be measured.

2. Where are water flow sensors used?

• A water flow sensor is installed at a water source or pipe to measure the flow rate of water and calculate the amount of water that has passed through the pipe. It is used in flowmeters for water heaters and vending machines.

3. How do I choose a water flow sensor?

• Choosing a water flow sensor can depend on the following factors: 
• Operating pressure and pipe diameter  
• Volume of the fluid flowing at a time    
• Flow rate of the water flow sensor

Shipping Policy

• Free Delivery on all Orders Above Rs 999/-
• All orders confirmed before 3:00 PM IST are shipped the same day, barring rare pickup delays on holidays or disturbances.
• Delivery time in Metro cities is 1–3 days; for other locations, it is 3–7 days. Delivery varies based on location and courier service.

Return & Refund Policy

• Return window: 7 days from receipt unless stated otherwise.
• No refunds or replacements after the return window.
• Returns are accepted only for non-working or damaged products.
• Initiate return requests via a Support ticket or contact us at +91-8123057137.
• Refunds are processed within 3–4 working days after inspection and approval.