You can now either copy the code inside a file called Flow_sensor_measure_volume.ino, or just get the complete code from the folder for this project.

In this part, we calculate the flow and volume from the sensor:

int pin = 2; 
volatile unsigned int pulse; 
float volume = 0; 
floatflow_rate =0; 
constintpulses_per_litre = 450; 

We set up the interrupt:

void setup() 
{ 
Serial.begin(9600); 
pinMode(pin, INPUT); 
attachInterrupt(0, count_pulse, RISING); 
} 

Start the interrupt:

void loop() 
{ 
pulse=0; 
interrupts(); 
delay(1000); 
noInterrupts(); 

Then we display the flow rate of the sensor:

Serial.print("Pulses per second: "); 
Serial.println(pulse); 
 
flow_rate = pulse * 1000/pulses_per_litre; 

We calculate the volume of the sensor:

Serial.print("Water flow rate: "); 
Serial.print(flow_rate); 
Serial.println(" milliliters per second"); 
...