#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

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();

//millis reset to avoid overflow (to be 20 days in milliseconds)
if(millis() >= 43000)
 {noInterrupts ();
  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( currentMillis - previousMillisBlink >= 2000){
  enablereading = !enablereading;
  previousMillisBlink = currentMillis;
  }
  if(enablereading){
   if((F2>=0))
    {digitalWrite(red, HIGH);}
    if((F2<-10 && F2<0))
    {digitalWrite(red, HIGH);}
    if((F2<-10 ))
    {digitalWrite(red, LOW);}
    

   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.println();
    
   lcd.setCursor(0,0);
   lcd.print("R1     =       C");

   lcd.setCursor(14,0);

   lcd.print((char)223);

   lcd.setCursor(8,0);

   lcd.print(R1); 
//delay(1000);
   lcd.setCursor(0,1);

   lcd.print("F1     =       C");

   lcd.setCursor(14,1);

   lcd.print((char)223);

   lcd.setCursor(8,1);

   lcd.print(F1);
   //delay(100);
/*
   lcd.setCursor(0,0);

   lcd.print("F1     =       C");

   lcd.setCursor(14,0);

   lcd.print((char)223);

   lcd.setCursor(8,0);

   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);
   lcd.setCursor(0,1);

   lcd.print("R1     =       C");

   lcd.setCursor(14,1);
   lcd.print((char)223);
   lcd.setCursor(8,1);
   lcd.print(R1);
   //delay(1000);
   }



//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;}

 // the on time is added here 

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

   {

    counter --;

    previousMillisEnableBlink = currentMillis;

 
    enableBlink = !enableBlink;      

   }

   if( !enableBlink)

    {

      digitalWrite( green, LOW);    

    }

    if( enableBlink)                    

  {
    digitalWrite( green,HIGH);  
  }

goto label;

}