Using two flow sensors connected to one Arduino.

Using Arduino Sensors
7

Thanks for help binooetomo, but I can't get this to work properly. Actually, nothing work properly here right now. This works like a charmike a charm: WaterFlowGauge/WaterFlowGauge.pde at master · practicalarduino/WaterFlowGauge · GitHub

I have also tried to modify my first sketch to work, but nothing happends after compiling, uploading and opening the serial monitor.

I am so far here:

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);

byte sensorInterruptA = 0;
byte sensorInterruptB = 1;
byte sensorPinA = 2;
byte sensorPinB = 3;

float calibrationFactor = 4.5;

volatile byte pulseCount;

float flowRate;
unsigned int flowRateA;
unsigned int turFuel;
unsigned int returFuel;

unsigned long oldTime;

void setup()
{
lcd.begin(16, 2);
lcd.setCursor(0, 0);
lcd.print(" ");
lcd.setCursor(0, 1);
lcd.print(" ");

Serial.begin(9600);

pinMode(sensorPinA, INPUT);
pinMode(sensorPinB, INPUT);
digitalWrite(sensorPinA, HIGH);
digitalWrite(sensorPinB, HIGH);

pulseCount           = 0;
pulseCount           = 0;
flowRate             = 0.0;
sensorInterruptA     = 0;
sensorInterruptB     = 0;
oldTime              = 0;

attachInterrupt(sensorInterruptA, pulseCounter, FALLING);
attachInterrupt(sensorInterruptB, pulseCounter, FALLING);
}

//hovedprogrammet i loop.

void loop()
{
  if((millis() - oldTime > 1000))
  {
  detachInterrupt(sensorInterruptA);
  detachInterrupt(sensorInterruptB);

  oldTime =millis();

  flowRate = (sensorInterruptA - sensorInterruptB) / 8500;
  
  flowRate = ((1000.0 / (millis() - oldTime)) * pulseCount) / calibrationFactor;
  
  flowRateA = (flowRate / 60) * 1000;
  
  unsigned int frac;

  Serial.print(int(flowRateA));
  Serial.print(".");
  frac = (flowRateA - int(flowRateA)) * 10;
  Serial.print(frac, DEC) ;
  
  Serial.print(" ");
  Serial.print(flowRateA);

  lcd.setCursor(0, 0);
  lcd.print(" ");
  lcd.setCursor(0, 0);
  lcd.print("Flow: ");
  if(int(flowRate) < 10)
  {
    lcd.print(" ");
  }
  lcd.print((int)flowRate);
  lcd.print('.');
  lcd.print(frac, DEC) ;
  lcd.print(" L");
  lcd.print("/min");

  pulseCount = 0;

  attachInterrupt(sensorInterruptA, pulseCounter, FALLING);
  attachInterrupt(sensorInterruptB, pulseCounter, FALLING);
  }
}
  void pulseCounter()
{
  pulseCount++;
}

Regards, Fredrik