1/2 Inch Water Flow Sensor - YF-S201 Documentation

Component Name

1/2 Inch Water Flow Sensor - YF-S201

Overview

The 1/2 Inch Water Flow Sensor - YF-S201 is a digital flow sensor designed to measure the flow rate of liquids, particularly water, in a pipeline with a diameter of 1/2 inch. This sensor is widely used in various applications, including industrial automation, agricultural irrigation, and commercial water management systems.

Functionality

The YF-S201 sensor detects the flow rate of liquid by measuring the rotational speed of a impeller, which is magnetically coupled to a Hall effect sensor. When the liquid flows through the sensor, the impeller rotates, generating a series of electrical pulses that are proportional to the flow rate. The sensor then converts these pulses into a digital output signal, providing an accurate measurement of the flow rate.

Key Features

Measurement Range: 1-30 liter per minute (L/min)
Accuracy: 5% of the full scale
Response Time: <2 seconds
Operating Temperature: 0-80C (32-176F)
Operating Pressure: Up to 1.5 MPa (217 psi)
Pipe Size: 1/2 inch (DN15)
Output Signal: Digital pulse output (normally open collector)
Power Supply: 5-24 VDC (Typical: 12 VDC)
Current Consumption: <20 mA
Sensor Material: Brass (body), Stainless Steel (shaft), and POM (impeller)
Dimensions: 76 mm x 43 mm x 27 mm (3 inch x 1.7 inch x 1.1 inch)
Thread Type: G1/2 (BSP)

Additional Features

The sensor has a built-in filter to prevent debris from entering the sensor, reducing the risk of damage or malfunction.

The sensor is designed to be compact and lightweight, making it easy to install and maintain.

The digital output signal can be easily integrated with microcontrollers, PLCs, or other automation systems.

Applications

Industrial process control and automation

Agricultural irrigation systems

Commercial water management systems

Water treatment systems

HVAC systems

Laboratory equipment

Technical Specifications

| Parameter | Value |

| --- | --- |

| Flow Range | 1-30 L/min |

| Accuracy | 5% of full scale |

| Response Time | <2 seconds |

| Operating Temperature | 0-80C (32-176F) |

| Operating Pressure | Up to 1.5 MPa (217 psi) |

| Pipe Size | 1/2 inch (DN15) |

| Output Signal | Digital pulse output (normally open collector) |

| Power Supply | 5-24 VDC (Typical

12 VDC) |

| Current Consumption | <20 mA |

| Sensor Material | Brass (body), Stainless Steel (shaft), and POM (impeller) |

| Dimensions | 76 mm x 43 mm x 27 mm (3 inch x 1.7 inch x 1.1 inch) |

| Thread Type | G1/2 (BSP) |

Ordering Information

Pin Configuration

1/2 Inch Water Flow Sensor - YF-S201 Pinout Explanation
The 1/2 Inch Water Flow Sensor - YF-S201 is a Hall effect-based flow sensor designed to measure the flow rate of water or other liquids. It has a total of 5 pins, which are explained in detail below:
Pin 1: VCC (Power Supply)
Function: Provides power to the sensor
Voltage Range: 4.5V to 24V DC
Typical Operating Voltage: 5V DC or 12V DC
Recommended Power Supply: A stabilized voltage source with minimal noise and ripple is recommended to ensure accurate measurements.
Pin 2: GND (Ground)
Function: Provides a ground reference for the sensor
Connection: Connect to the ground terminal of the power supply or the microcontroller's ground pin
Importance: A stable ground connection is crucial for proper sensor operation and noise reduction.
Pin 3: OUT (Output)
Function: Provides the pulse output signal proportional to the flow rate
Signal Type: Digital pulse signal (TTL-compatible)
Pulse Frequency: The pulse frequency is directly proportional to the flow rate (more pulses per second indicate a higher flow rate)
Connection: Connect to a digital input pin on a microcontroller or a pulse counter module
Pin 4: No Connection (Reserved)
Function: There is no connection or functionality assigned to this pin
Connection: Leave this pin unconnected
Pin 5: No Connection (Reserved)
Function: There is no connection or functionality assigned to this pin
Connection: Leave this pin unconnected
Connection Structure:
To connect the YF-S201 water flow sensor to a microcontroller or a pulse counter module, follow this structure:
VCC (Pin 1) Power Supply (4.5V to 24V DC)
GND (Pin 2) Power Supply Ground or Microcontroller Ground
OUT (Pin 3) Digital Input Pin on Microcontroller or Pulse Counter Module
Pin 4 and Pin 5: Leave unconnected
Important Notes:
Ensure proper electrical connections to prevent sensor damage or inaccurate readings.
Use a suitable power supply with minimal noise and ripple to ensure accurate measurements.
The sensor output pulse frequency is directly proportional to the flow rate. You can use a microcontroller or a pulse counter module to measure the pulse frequency and calculate the flow rate accordingly.
Consult the datasheet and user manual for more detailed information on sensor calibration, flow rate calculation, and application-specific guidelines.

Code Examples

1/2 Inch Water Flow Sensor - YF-S201 Documentation

Overview

The YF-S201 is a 1/2 inch water flow sensor designed to measure the flow rate of water in industrial, commercial, and residential applications. This sensor is suitable for detecting water flow in pipes with a diameter of 1/2 inch or smaller. The sensor outputs a pulse signal proportional to the flow rate, allowing for accurate measurement and monitoring of water usage.

Pinout and Connections

The YF-S201 water flow sensor has three pins:

VCC (Red): Connect to a 5V power supply
 GND (Black): Connect to ground
 OUT (Yellow): Output pulse signal

Technical Specifications

Operating voltage: 5V DC
 Operating current: 15mA
 Flow measurement range: 1-30 L/min
 Pulse output frequency: 0.5-450 Hz
 Response time: <1 second

Code Examples

### Example 1: Basic Water Flow Measurement using Arduino

In this example, we will connect the YF-S201 water flow sensor to an Arduino board to measure the water flow rate.
```c
const int flowSensorPin = 2;  // Output pulse signal connected to digital pin 2
volatile int pulseCount = 0;

void setup() {
  Serial.begin(9600);
  pinMode(flowSensorPin, INPUT);
  attachInterrupt(digitalPinToInterrupt(flowSensorPin), pulseCounter, RISING);
}

void loop() {
  pulseCount = 0;
  delay(1000);  // Measure flow rate over 1 second
  float flowRate = (pulseCount / 7.5);  // Convert pulse count to L/min
  Serial.print("Water flow rate: ");
  Serial.print(flowRate);
  Serial.println(" L/min");
}

void pulseCounter() {
  pulseCount++;
}
```
In this example, we use an interrupt to count the pulse output from the YF-S201 sensor. The `pulseCounter()` function increments a counter for each rising edge detected on the output signal. In the `loop()` function, we measure the pulse count over a 1-second period and convert it to a flow rate in L/min using the sensor's calibration factor.

### Example 2: Water Flow Monitoring using Raspberry Pi and Python

In this example, we will connect the YF-S201 water flow sensor to a Raspberry Pi to monitor water flow rates and display the data on a graphical interface.
```python
import RPi.GPIO as GPIO
import time
import matplotlib.pyplot as plt

GPIO.setmode(GPIO.BCM)
GPIO.setup(17, GPIO.IN, pull_up_down=GPIO.PUD_UP)  # Output pulse signal connected to GPIO 17

pulse_count = 0
flow_rate = []

def pulse_counter(channel):
    global pulse_count
    pulse_count += 1

GPIO.add_event_detect(17, GPIO.RISING, callback=pulse_counter, bouncetime=10)

while True:
    pulse_count = 0
    time.sleep(1)  # Measure flow rate over 1 second
    flow_rate.append((pulse_count / 7.5))  # Convert pulse count to L/min
    print("Water flow rate: {:.2f} L/min".format(flow_rate[-1]))

# Plot the flow rate data
    plt.plot(flow_rate)
    plt.xlabel("Time (s)")
    plt.ylabel("Flow Rate (L/min)")
    plt.title("Water Flow Monitoring")
    plt.show(block=False)
    plt.pause(0.01)
```
In this example, we use the RPi.GPIO library to detect the pulse output from the YF-S201 sensor and count the pulses using a callback function. We then display the flow rate data on a graphical interface using Matplotlib.

Note: These code examples are for illustration purposes only and may require modifications to suit your specific application.

1/2 Inch Water Flow Sensor - YF-S201

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1/2 Inch Water Flow Sensor - YF-S201

Component Name

Package

Warranty

Certification

Pin Configuration

Code Examples