Manual

Programming
// reading liquid flow rate using Seeeduino and Water Flow Sensor from
Seeedstudio.com
// Code adapted by Charles Gantt from PC Fan RPM code written by Crenn
@thebestcasescenario.com
// http:/themakersworkbench.com http://thebestcasescenario.com
http://seeedstudio.com
volatile int
NbTopsFan; //measuring the rising edges of the signal
int
Calc;
int
hallsensor = 2; //The pin location of the sensor
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
}
// The setup() method runs once, when the sketch starts
void setup
() //
{
pinMode(hallsensor,
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
}
// the loop() method runs over and over again,
// as long as the Arduino has power
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
.print (" L/hour
\r\n
"); //Prints "L/hour" and returns a new line
}
You can refer our forum for more details about Reading Water Flow rate with Water Flow Sensor.