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#define codeVersion "Flow sensor LCD Micro"
#define compilationDate __DATE__
#define compilationTime __TIME__
/* BOARD                           INT.0 INT.1 INT.2 INT.3 INT.4 INT.5
Uno, Ethernet                       2     3
Mega2560                            2     3     21    20    19    18
32u4 based (e.g Leonardo, Micro)    3     2     0     1     7                 */
#define flowSensorInterrupt 4 //Flow sensor interrupt 4 is on digital pin 7 for Arduino Micro
#define pinFlowSensor 7 //Flow sensor pin
#define flowFrequency 5.5 //F=5.5 * Q (L / Min)
#define readSensorsTimeInterval 10000 //10 sec

#include <LiquidCrystal_I2C.h>
#include <Wire.h> 

unsigned long loopTime, readSensorsTime;   
int ret,i,imp1,imp2,F,FQ;

volatile long lastFlowPulseTime;
long FlowPulseTime;

LiquidCrystal_I2C lcd(0x20, 16,2); // Set the LCD I2C address

void setup() 
{
  delay(1000);
  Serial.begin(9600);
  delay(1000);
  Serial.println(codeVersion);
  Serial.print("Compilation date: ");
  Serial.println(compilationDate);
  Serial.print("Compilation time: ");
  Serial.println(compilationTime);
  delay(1000);

  attachInterrupt (flowSensorInterrupt, Pulse1, FALLING); 
  pinMode(pinFlowSensor, INPUT);
  digitalWrite(pinFlowSensor, HIGH);
  imp1=0;
  lcd.init(); // initialize the lcd for 16 chars 2 lines, turn on backlight
  lcd.backlight();
  lcd.clear();
  lcd.setCursor(0, 0);  //line=1, x=0
  lcd.print(compilationDate); 
  lcd.setCursor(0, 1);  //line=2, x=0
  lcd.print(compilationTime); 
  delay(5000);
}

void Pulse1()
{
  imp1++;
}

void loop()
{
  loopTime=millis();
  sensorsRead(); 
}

void sensorsRead() 
{
  if (loopTime-readSensorsTime>readSensorsTimeInterval)
  {
    readSensorsTime=loopTime;
    F=60000*imp1/flowFrequency/readSensorsTimeInterval;
    imp1=0;    
    FQ=FQ+F/readSensorsTimeInterval/3600000;
    HP_LCD();
    Serial.print("Run time: ");
    Serial.print(loopTime/1000);
    Serial.print(" s Flow: ");
    Serial.print(F);
    Serial.print(" l/h; Total: ");
    Serial.print(FQ);
    Serial.println(" m3");
 }
}
void HP_LCD()
{
  char buffer [33];
    lcd.clear();
    lcd.setCursor(0, 0);  //line=1, x=0
    lcd.print("Flow "); 
    itoa ((int)F,buffer,10);
    lcd.print(buffer); 
    lcd.print(" l/h"); 

    lcd.setCursor(0, 5);  //line=1, x=5
    lcd.print("Counter "); 
    itoa ((int)FQ,buffer,10);
    lcd.print(buffer); 
    lcd.print(" m3"); 
}