#include <LiquidCrystal_I2C.h>
#include <EEPROM.h>

LiquidCrystal_I2C lcd(0x27,16,2);

#define motor 2
#define line 3
#define tank 4
#define blue 8

#define set 5
#define inc 7
#define dec 6

long hrs, mins=30;
long h1,m1,s1,rem;
long sec;

void setup() 
{
    lcd.begin(16,2);
    lcd.backlight();
    sec=EEPROM.get(0,sec);
    pinMode(motor, OUTPUT);
    pinMode(blue, OUTPUT);
    pinMode(line, INPUT_PULLUP);
    pinMode(tank, INPUT_PULLUP);

    pinMode(set, INPUT_PULLUP);
    pinMode(inc, INPUT_PULLUP);
    pinMode(dec, INPUT_PULLUP);


   // attachInterrupt(digitalPinToInterrupt(line), lcdClear, CHANGE);
   if(digitalRead(line)==1)
   {
      digitalWrite(motor, LOW);
      digitalWrite(blue, LOW);
      lcd.setCursor(0,0);
      lcd.print("Motor OFF    ");

   }
   else
   {
      digitalWrite(motor, HIGH);
      digitalWrite(blue, HIGH);
      lcd.setCursor(0,0);
      lcd.print("Motor ON    ");
   } 
   
}

void loop() 
{
         
   start:

   if(digitalRead(line)==0)
      digitalWrite(blue,HIGH);
   else
      digitalWrite(blue, LOW);    

   if(digitalRead(motor)==1)
   {
      lcd.setCursor(0,0);
      lcd.print("Motor ON    ");
   }
   else
   {
     lcd.setCursor(0,0);
     lcd.print("Motor OFF");
   }

   if(digitalRead(tank)==0)
   {
      digitalWrite(motor, LOW);
      lcd.setCursor(0,0);
      lcd.print("Motor OFF");
      lcd.setCursor(0,1);
      lcd.print("Tank Full      ");
   }
   else
   {
      h1 = sec/3600;
      rem = sec%3600;
      m1 = rem/60;
      s1 = rem%60;
      
      sec--;
      lcd.setCursor(0,1);
      lcd.print("Time ");
      lcd.print(h1);
      lcd.print(":");
      lcd.print(m1);
      lcd.print(":");
      lcd.print(s1);
      
      delay(1000);
      
      if(s1==0 or s1==10)
         lcd.clear(); // clear lcd when sec=0
            
      if(sec<1)
      {
        if(digitalRead(line)==0)
        {
          digitalWrite(motor, HIGH);
          lcd.setCursor(0,0);
          lcd.print("Motor ON    ");
        }
        else
        {
          digitalWrite(motor, LOW);
          lcd.setCursor(0,0);
          lcd.print("Motor OFF    ");

        }
        sec = hrs*3600 + mins*60;
      }
      
      if(digitalRead(line)==1)
      {
          digitalWrite(motor, LOW);
          lcd.setCursor(0,0);
          lcd.print("Motor OFF    ");
      }

    }

   if(digitalRead(set)==0)
   {
       lcd.clear();
       
       loop1:
         delay(50);
         if(digitalRead(set)==1)
         {
           delay(50);
           goto hour;
         }
       goto loop1;            
       
       hour:
          
          lcd.setCursor(0,0);
          lcd.print("Time ");
          lcd.print(hrs);
          lcd.print(":");
          lcd.print(mins);
             
          if(digitalRead(inc)==0)
          {
            hrs++;
            delay(200);
            lcd.clear();
          } 
          
          if(digitalRead(dec)==0)
          {
            hrs--;
            delay(200);
            lcd.clear();
          } 
          
          if(hrs<0)
            hrs=0;
          
           if(digitalRead(set)==0)
           {
              delay(50);
              loop2:
                if(digitalRead(set)==1)
                {
                   delay(50);
                   goto minutes;
                }     
              goto loop2;
           }
        goto hour;

        minutes:
          lcd.setCursor(0,0);
          lcd.print("Time ");
          lcd.print(hrs);
          lcd.print(":");
          lcd.print(mins);
   
          if(digitalRead(inc)==0)
          {          
            mins++;
            delay(200);
            lcd.clear();
          }
          if(digitalRead(dec)==0)
          {          
            mins--;
            delay(200);
            lcd.clear();
          }
          
          if(mins<0)
            mins=0;
          
           if(digitalRead(set)==0)
           {
             loop3:
             delay(50);
               if(digitalRead(set)==1)
               {
                 delay(50);
                 lcd.clear();  
                 sec = hrs*3600 + mins*60;
                 EEPROM.put(0,sec);
                 goto start;
               }
             goto loop3;
           } 
        goto minutes;      

   }
}