Calculating water flow rate based on the pulses counted

In this part, we measure the pulses and convert them to the flow of water using the following steps:

1. Open a new Arduino IDE, and copy the following sketch.
2. 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); 
           } 
   

3. 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.print("Water flow rate: "); 
           Serial.print(pulse * 1000/pulses_per_litre...