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Author Topic: Flow sensor project  (Read 464 times)
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Im working on a flow sense project. I purchased a flow sensor from Futurlec and am having trouble with the calibration. I am using some code from Charles Grantt. The sensor data sheet I have gives me liters per pulse which is .0005 liters per pulse. Is all I have to do is change the calc equation to calc=.0005 * frequency * 3600 to get liters/hr?

// reading liquid flow rate using Seeeduino and Water Flow Sensor from
// Code adapted by Charles Gantt from PC Fan RPM code written by Crenn
// http:/

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

  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

Dee Why NSW
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This link might be useful
« Last Edit: February 19, 2013, 08:29:14 pm by Nick_Pyner » Logged

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