Water flow meter

This water flow meter is mainly used for water testing, water cooling system and hydroponics.
High amplitude ≥ 4.6V
Low amplitude ≤ 0.5V
Electric strength 1250V/min
Insulation resistance ≥ 100MΩ
Hydrostatic pressure testing ≤ 2.0Mpa

Specification:

The lowest rated working voltage: DC4.5 5V-24V
Maximum operating current: 15 mA (DC 5V)
Working voltage range: DC 5~18 v
Load capacity: ≤ 10 mA (DC 5V)
Use temperature: ≤ 80°C
Operating humidity range: 35%~90%RH (no frost)
Allowing pressure: pressure 2.0Mpa
Temperature: -25~+80 °C
External threads: 1/2"
Outer diameter: 20mm
Intake diameter: 9mm
Outlet diameter: 12mm

Example code:

// 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 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 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/hourrn");      ​ ​//Prints "L/hour" and returns a new line