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Measure liquid/water flow for your...
Measure liquid/water flow for your solar, computer cooling, or gardening project using this handy basic flow meter.
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This sensor sit in line with your water line, and uses a pinwheel sensor to measure how much liquid has moved through it. The pinwheel has a little magnet attached, and there's a hall effect magnetic sensor on the other side of the plastic tube that can measure how many spins the pinwheel has made through the plastic wall. This method allows the sensor to stay safe and dry.
// Reading liquid flow rate using an Arduino
// Code adapted by Charles Gantt from PC Fan RPM code written by Crenn@thebestcasescenario.com
// http:/themakersworkbench.com http://thebestcasescenario.com
volatile int NbTopsFan; //measuring the rising edges of the signal
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 signal
} //The setup() method runs once, when the sketch starts
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/hourrn"); //Prints "L/hour" and returns a new line