Build Instructions

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  Run a Program

  volatile int flow_frequency; // Measures flow sensor pulses
  // Calculated litres/hour
  float vol = 0.0,l_minute;
  unsigned char flowsensor = 2; // Sensor Input
  unsigned long currentTime;
  unsigned long cloopTime;
  #include
  LiquidCrystal lcd(12, 11, 5, 4, 3, 9);
  void flow () // Interrupt function
  {
  flow_frequency++;
  }
  void setup()
  {
  pinMode(flowsensor, INPUT);
  digitalWrite(flowsensor, HIGH); // Optional Internal Pull-Up
  Serial.begin(9600);
  lcd.begin(16, 2);
  attachInterrupt(digitalPinToInterrupt(flowsensor), flow, RISING); // Setup Interrupt
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Water Flow Meter");
  lcd.setCursor(0,1);
  lcd.print("Circuit Digest");
  currentTime = millis();
  cloopTime = currentTime;
  }
  void loop ()
  {
  currentTime = millis();
  // Every second, calculate and print litres/hour
  if(currentTime >= (cloopTime + 1000))
  {
  cloopTime = currentTime; // Updates cloopTime
  if(flow_frequency != 0){
  // Pulse frequency (Hz) = 7.5Q, Q is flow rate in L/min.
  l_minute = (flow_frequency / 7.5); // (Pulse frequency x 60 min) / 7.5Q = flowrate in L/hour
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Rate: ");
  lcd.print(l_minute);
  lcd.print(" L/M");
  l_minute = l_minute/60;
  lcd.setCursor(0,1);
  vol = vol +l_minute;
  lcd.print("Vol:");
  lcd.print(vol);
  lcd.print(" L");
  flow_frequency = 0; // Reset Counter
  Serial.print(l_minute, DEC); // Print litres/hour
  Serial.println(" L/Sec");
  }
  else {
  Serial.println(" flow rate = 0 ");
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Rate: ");
  lcd.print( flow_frequency );
  lcd.print(" L/M");
  lcd.setCursor(0,1);
  lcd.print("Vol:");
  lcd.print(vol);
  lcd.print(" L");
  }
  }
  }

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