2″_SKU__SEN0217 - jimaobian/DFRobotWiki GitHub Wiki

The Water Flow sensor measures the rate of a liquid flowing through it. The YF-S201 water flow sensor consists of a plastic valve body, flow rotor and hall effect sensor. It is usually used at the inlet end to detect the amount of flow. When liquid flows through the sensor, a magnetic rotor will rotate and the rate of rotation will vary with the rate of flow. The hall effect sensor will then output a pulse width signal. Connect it to a microcontroller and you can monitor multiple devices such as your coffee maker, sprinkler or anything else, and control the water flow rate to suit your needs!

• A 20 mm rifled pipe is recommended
• Avoid unit contact with corrosive chemicals
• The unit must be installed vertically, tilted no more than 5 degrees
• Liquid temperature should be less than 120 C to avoid damage to unit

• Inner Diameter: 11 mm
• Outside diameter: 20 mm
• Proof Water Pressure: <1.75 MPa
• Water Flow Range: 1-30 L/min
• Voltage Range: 3.5~12 V
• Operating Current: 15 mA (DC 5V)
• Insulation Resistance: >100 MΩ
• Accuracy: ±5% (2~30L/min)
• The Output Pulse High Level: >4.7 VDC (DC input voltage 5 V)
• The Output Pulse Low Level: <0.5 VDC (DC input voltage 5 V)
• Output Pulse Duty Ratio: 50% ± 10%
• Water-flow Formula: 1L = 450 square waves
• Working Humidity Range: 25% ~ 95% RH (no frost)
• Dimension: 62*36*35 mm/2.44*1.37*1.37 inches
• Weight: 52g

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                                                            |-------------------------------------------------------------|
                                                            | |                                                         |
                                                             |---------------------------------------------------------|
                                                             | |            |           |          |                 |
                                                              |------------|-----------|----------|-----------------|
                                                              | **Number** | **Color** | **Name** | **Description** |
                                                              ||
                                                              | 1          | Green     | Signal   | Pulse Signal    |
                                                              | 2          | Red       | VCC      | 5~12V           |
                                                              | 3          | Black     | GND      | GND             |  |  |  |

Pulse Signal

In this Tutorial, we'll measure liquid flow using this sensor.

• Hardware
  • DFRduino UNO R3
  • Water flow sensor
  • Jumper Wires

• Software
  • Arduino IDE, [https://www.arduino.cc/en/Main/Software| Click to Download Arduino IDE from Arduino®]

/***************************************************
 This example reads Water flow sensor Sensor.

 Created 2016-3-13
 By berinie Chen <[email protected]>

 GNU Lesser General Public License.
 See <http://www.gnu.org/licenses/> for details.
 All above must be included in any redistribution
 ****************************************************/

/***********Notice and Trouble shooting***************
 1.Connection and Diagram can be found here  http://www.dfrobot.com/wiki/index.php?title=Water_Flow_Sensor_-_1/2%E2%80%B3_SKU:_SEN0217#Sample_Code
 2.This code is tested on Arduino Uno.
 ****************************************************/
volatile double waterFlow;
void setup() {
  Serial.begin(9600);  //baudrate
  waterFlow = 0;
  attachInterrupt(0, pulse, RISING);  //DIGITAL Pin 2: Interrupt 0
}
void loop() {
  Serial.print("waterFlow:");
  Serial.print(waterFlow);
  Serial.println("   L");
  delay(500);
}

void pulse()   //measure the quantity of square wave
{
  waterFlow += 1.0 / 450.0;
}

shopping from dfrobot store or dfrobot distributor.