G1/2 Water Flow Sensor (SEN-HZ21WA) [S135]

G1/2 Water Flow Sensor (SEN-HZ21WA) [S135]

https://www.youtube.com/watch?v=NLIilod1J9E

*GitHub : https://github.com/rdiot/rdiot-s135.git

* Specs

Mini. Wokring Voltage: DC 4.5V

Max. Working Current: 15mA (DC 5V)

Working Voltage: DC 5V~24V

Flow Rate Range: 1~30L/min

Load Capacity: ≤10mA (DC 5V)

Operating Temperature: ≤80℃

Liquid Temperature: ≤120℃

Operating Humidity: 35%～90%RH 

Water Pressure: ≤1.75MPa

Storage Temperature: -25～+ 80℃

Storage Humidity: 25%～95%RH

* Content

- Connect

Red ---- 5V

Yellow ----- P10k(5V) ----- D2

Black ----- GND

- Key Code

#include <Wire.h> 

#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,20,4);  // LCD2004

volatile int NbTopsFan; //measuring the rising edges of the signal

int Calc;                               

int hallsensor = 2;    //The pin location of the sensor : D2

 

void rpm ()     //This is the function that the interupt calls 

{ 

  NbTopsFan++;  //This function measures the rising and falling edge of the hall effect sensors signal

} 

void setup()

{

  Serial.begin(9600); 

  pinMode(hallsensor, INPUT);

  attachInterrupt(0, rpm, RISING); //and the interrupt is attached

}

void loop()

{

  NbTopsFan = 0;   //Set NbTops to 0 ready for calculations

  sei();      //Enables interrupts

  delay (1000);   //Wait 1 second

  cli();      //Disable interrupts

  Calc = (NbTopsFan * 60 / 7.5); //(Pulse frequency x 60) / 7.5Q, = flow rate in L/hour

  Serial.print (Calc, DEC); //Prints the number calculated above

  Serial.println (" L/hour"); 

}