volatile int FlowPulse; //measuring the rising edges of the signal
volatile int FlowPulse1; //measuring the rising edges of the signal
int Calc;
int Calc1;
int Calc2;
int flowsensor = 2; //The pin location of the sensor
int flowsensor1 = 3; //The pin location of the sensor

void setup() {

pinMode(flowsensor, INPUT); //initializes digital pin 2 as an input
Serial.begin(9600); //This is the setup function where the serial port is initialised,
attachInterrupt(0, rpm, RISING); //and the interrupt is attached

pinMode(flowsensor1, INPUT); //initializes digital pin 2 as an input
Serial.begin(9600); //This is the setup function where the serial port is initialised,
attachInterrupt(1, rpm1, RISING); //and the interrupt is attached


}

void loop() {

FlowPulse = 0; //Set NbTops to 0 ready for calculations
sei(); //Enables interrupts
delay(1000); //Wait 1 second
cli(); //Disable interrupts
Calc = (FlowPulse * 60 / 7.5); //(Pulse frequency x 60) / 7.5Q, = flow rate in L/hour
Serial.print (Calc, DEC); //Prints the number calculated above
Serial.print (" L/hour\r\n"); //Prints "L/hour" and returns a new line

FlowPulse1 = 0; //Set NbTops to 0 ready for calculations
sei(); //Enables interrupts
delay(1000); //Wait 1 second
cli(); //Disable interrupts
Calc1 = (FlowPulse1 * 60 / 7.5); //(Pulse frequency x 60) / 7.5Q, = flow rate in L/hour
Serial.print (Calc1, DEC); //Prints the number calculated above
Serial.print (" L/hour1\r\n"); //Prints "L/hour" and returns a new line

sei(); //Enables interrupts
delay(2000); //Wait 1 second
cli(); //Disable interrupts
Calc2 = (Calc - Calc1);
Serial.print (Calc2, DEC); //Prints the number calculated above
Serial.print (" L/hour rozdil\r\n"); //Prints "L/hour" and returns a new line
Serial.print ("  \r\n");

sei(); //Enables interrupts
delay(1000); //Wait 1 second
cli(); //Disable interrupts






}

void rpm () //This is the function that the interupt calls
{
FlowPulse++; //This function measures the rising and falling edge of the hall effect sensors signal

}

void rpm1 () //This is the function that the interupt calls
{
FlowPulse1++; //This function measures the rising and falling edge of the hall effect sensors signal

}