//sensor reading -127 means faulty connections
#include <DallasTemperature.h>

#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

OneWire oneWire1(10);

DallasTemperature sensors1(&oneWire1);

OneWire oneWire2(11);

DallasTemperature sensors2(&oneWire2);

OneWire oneWire3(12);

DallasTemperature sensors3(&oneWire3);

const int  red        = 13;

const int  green      = 14;  

unsigned long previousMillisEnableBlink;

unsigned long previousMillisBlink;

unsigned long previousMilliscounter;

bool enableBlink = false;

bool blink = false;

bool enablereading = false;

int counter =0; //one counter with two actions
float countertime=0;
float totaltime;

extern volatile unsigned long timer0_millis;

void setup(void)

{

  Serial.begin(9600);
 
 lcd.init();

lcd.backlight();

 Serial.println("Measuring 3 sensors' temperatures");

pinMode(red, OUTPUT);    

  sensors1.begin();

  sensors2.begin();

  sensors3.begin();

}

void loop(void)

{

  digitalWrite(red, LOW);

  digitalWrite (green, LOW);

delay(12000); // a delay to absorb any power fluctuations on startup

label:

unsigned long currentMillis = millis();

totaltime = (countertime * 125000) +millis(); 

//millis reset to avoid overflow (to be 20 days in milliseconds)

if(millis() >= 125000)

 {noInterrupts ();
 countertime ++;
  timer0_millis=0;

 previousMilliscounter=0;

 previousMillisBlink=0;

 previousMillisEnableBlink=0;

 currentMillis=0;

 previousMillisBlink=0;

 interrupts();}

sensors1.requestTemperatures();

sensors2.requestTemperatures();

sensors3.requestTemperatures();

  float R1 = sensors1.getTempCByIndex(0);

  float F1 = sensors2.getTempCByIndex(0);

  float F2= sensors3.getTempCByIndex(0);

//sensor reading display delay

 if((F2>=0) && digitalRead(green) == LOW)

    {digitalWrite(red, HIGH);}

    if((F2<-10 && F2<0) && digitalRead(green) == LOW )

    {digitalWrite(red, HIGH);}

    if((F2<-10 ))

    {digitalWrite(red, LOW);}

 if( currentMillis - previousMillisBlink >= 2000){

  enablereading = !enablereading;

  previousMillisBlink = currentMillis;

  }

  if(enablereading){

   Serial.print("R1=");

   Serial.print(R1);

   Serial.print(", ");

   Serial.print("F1=");

   Serial.print(F1);

   Serial.print(", ");

   Serial.print("F2=");

   Serial.print(F2);

   Serial.print(", ");

   Serial.print("m=");

   Serial.print(millis());

   Serial.print(", ");

   Serial.print("cm=");

   Serial.print(currentMillis);

   Serial.print(", ");

   Serial.print("pmeb=");

   Serial.print(previousMillisEnableBlink);

   Serial.print(", ");

   Serial.print("pmb=");

   Serial.print(previousMillisBlink);

   Serial.print(", ");

   Serial.print("eb=");

   Serial.print(enableBlink);
    Serial.print(", ");
   
   Serial.print("total time=");

   Serial.print(totaltime/60000);

   Serial.println();

   lcd.setCursor(0,0);

   lcd.print("R1     =       C");

   lcd.setCursor(14,0);

   lcd.print((char)223);

   lcd.setCursor(8,0);

   lcd.print(R1);

   lcd.setCursor(0,1);
   lcd.print("F1     =       C");
   lcd.setCursor(14,1);
   lcd.print((char)223);
   lcd.setCursor(8,1);
   lcd.print(F1);
   
   }

  if(!enablereading)  {

   lcd.setCursor(0,0);

   lcd.print("F2     =       C");

   lcd.setCursor(14,0);
   lcd.print((char)223);
   lcd.setCursor(8,0);
   lcd.print(F2);
    delay(2000);
    lcd.setCursor(0,1);
   lcd.print("R1     =       C");
   lcd.setCursor(14,1);
   lcd.print((char)223);
   lcd.setCursor(8,1);
   lcd.print(R1);
 delay(2000);

                   lcd.setCursor(0,1); //column/row

                  lcd.print("Time   =     min");
                 
                  lcd.setCursor(8,1); //column/row
                  
                  lcd.print(totaltime/60000);
                  delay(2000);
   }

/*energize green led once every 24 hours each for ??? minutes
without affecting lcd display scrolling text or
red led functionality
below line represents the 24 hour timer during which an action will start & stop once
& one counter to count two actions on/off*/

 if(currentMillis - previousMilliscounter >= 20000){
    counter = 2;
    previousMilliscounter= currentMillis;}

 // green led ON period

if ( currentMillis - previousMillisEnableBlink >= 10000 && (counter == 2 || counter == 1) )

   {

    counter --;
    digitalWrite(red, LOW);
    previousMillisEnableBlink = currentMillis;

    enableBlink = !enableBlink;      

   }

   if( !enableBlink)

    {

      digitalWrite( green, LOW);    

    }

    if( enableBlink)                    

  {

    digitalWrite( green,HIGH);  

  }
goto label;

}