Open a new Arduino IDE, and copy the following sketch.

Verify and upload the sketch on the Arduino board.

        int pin = 2; 
        volatile unsigned int pulse; 
        constintpulses_per_litre = 450; 
 
        void setup() 
        { 
          Serial.begin(9600); 
 
          pinMode(pin, INPUT); 
          attachInterrupt(0, count_pulse, RISING); 
        } 

The following code will calculate the pulses that are reading from the sensor; we divide the number of pulses counted in one second, and we have pulses per liter:

      void loop() 
      { 
        pulse = 0; 
        interrupts(); 
        delay(1000); 
        noInterrupts(); 
 
        Serial.print("Pulses per second: "); 
        Serial.println(pulse); 
 
        Serial...