#include <LiquidCrystal_I2C.h>  // library i2c LCD
//#include <Wire.h>   // library I2C
#include "DHT.h"    // library DHT sensor

#define DHTPIN  10    // pin data DHT at D11
#define DHTTYPE DHT22   // DHT type DHT22/ AM2302

LiquidCrystal_I2C lcd(0x27,20,4);  // set i2c lcd addr to 0x27
DHT dht(DHTPIN, DHTTYPE);
extern volatile unsigned long timer0_millis;
unsigned long current_time;
unsigned long time_=0;
unsigned long time1_=0;
const int Potensio = A1;
int value,suhumax,suhumin;
int start = 4;
int reset = 3;
int coil = 7;
int fan = 8;
int T,Tmin;
bool startbutton=0;
bool resetbutton=0;
bool pushed_1=0;
bool pushed_2=0;
void setup() 
{
  // put your setup code here, to run once:
  Serial.begin(9600);
  Wire.begin();
  dht.begin();
  lcd.begin(16,2);
  lcd.setBacklight(255);
  pinMode(Potensio, INPUT);
  pinMode(start, INPUT);
  pinMode(reset, INPUT);
  pinMode(coil, OUTPUT);
  pinMode(fan, OUTPUT);
  digitalWrite(fan, HIGH);
  digitalWrite(coil, HIGH);
  time_=millis();
  time1_=millis();
  lcd.setCursor(0,0);
  lcd.print("DRYING BOX WITH");
  lcd.setCursor(1,1);
  lcd.print("COOLING SYSTEM");
  delay(2000);
  lcd.clear();
  lcd.setCursor(1,0);
  lcd.print("PT WILMAR PADI");
  lcd.setCursor(3,1);
  lcd.print("INDONESIA");
  delay(2000);
  
}

void loop() 
{
  // put your main code here, to run repeatedly:
  lcd.clear();
  lcd.setCursor(10,0);
  lcd.print("PRESS");
  lcd.setCursor(10,1);
  lcd.print("START");
  value=analogRead(Potensio);
  suhumax = map(value,0,1023,0,100);
  suhumin = suhumax-2;
  startbutton = digitalRead(start);
  resetbutton = digitalRead(reset);
  int suhu = dht.readTemperature();      // read temp on celcius
  float hum = dht.readHumidity();     // read humidity
  
  if (startbutton==HIGH)
      { lcd.clear();
        pushed_1=1-pushed_1;
        
      }

        if (pushed_1==HIGH)
            {
                timer0_millis=millis();
                current_time=millis();
                      if((current_time-time_)<600000)
                          { lcd.clear();
                            lcd.setCursor(10,0);
                            lcd.print("DRYING");
                            lcd.setCursor(10,1);
                            lcd.print("MODE");
                            if ((current_time-time_)>=0&&(current_time-time_)<=120000)
                            {  T=54;
                               Tmin=T-2;
                                if( suhu <= Tmin )
                                     { 
                                       digitalWrite(coil, LOW);//coil pemanas ON
                                       digitalWrite(fan, LOW);//fan ON
                                    }
     
                                  if (suhu>T)
                                     { 
                                       digitalWrite(coil, HIGH);//coil pemanas OFF
                                       digitalWrite(fan, LOW);//fan ON
                                     }
                            }
                            if ((current_time-time_)>=120000&&(current_time-time_)<=240000)
                            {  T=52;
                               Tmin=T-2;
                                if( suhu <= Tmin )
                                     { 
                                       digitalWrite(coil, LOW);//coil pemanas ON
                                       digitalWrite(fan, LOW);//fan ON
                                    }
     
                                  if (suhu>T)
                                     { 
                                       digitalWrite(coil, HIGH);//coil pemanas OFF
                                       digitalWrite(fan, LOW);//fan ON
                                     }
                            }
                            if ((current_time-time_)>=240000&&(current_time-time_)<=360000)
                            {  T=50;
                               Tmin=T-2;
                                if( suhu <= Tmin )
                                     { 
                                       digitalWrite(coil, LOW);//coil pemanas ON
                                       digitalWrite(fan, LOW);//fan ON
                                    }
     
                                  if (suhu>T)
                                     { 
                                       digitalWrite(coil, HIGH);//coil pemanas OFF
                                       digitalWrite(fan, LOW);//fan ON
                                     }
                            }
                            if ((current_time-time_)>=360000&&(current_time-time_)<=480000)
                            {  T=48;
                               Tmin=T-2;
                                if( suhu <= Tmin )
                                     { 
                                       digitalWrite(coil, LOW);//coil pemanas ON
                                       digitalWrite(fan, LOW);//fan ON
                                    }
     
                                  if (suhu>T)
                                     { 
                                       digitalWrite(coil, HIGH);//coil pemanas OFF
                                       digitalWrite(fan, LOW);//fan ON
                                     }
                            }
                            if ((current_time-time_)>=480000&&(current_time-time_)<=600000)
                            {  T=46;
                               Tmin=T-2;
                                if( suhu <= Tmin )
                                     { 
                                       digitalWrite(coil, LOW);//coil pemanas ON
                                       digitalWrite(fan, LOW);//fan ON
                                    }
     
                                  if (suhu>T)
                                     { 
                                       digitalWrite(coil, HIGH);//coil pemanas OFF
                                       digitalWrite(fan, LOW);//fan ON
                                     }
                            }
                          }
                      if((current_time-time1_)>600000)
                          { lcd.clear();
                            lcd.setCursor(9,0); 
                            lcd.print("COOLING");
                            lcd.setCursor(11,1);
                            lcd.print("MODE");
                            T=40;
                            Tmin=T-2;
                            if( suhu <= Tmin )
                                { 
                                  digitalWrite(coil, LOW);//coil pemanas ON
                                  digitalWrite(fan, LOW);//fan ON
                                }
     
                            if (suhu>T)
                                { 
                                  digitalWrite(coil, HIGH);//coil pemanas OFF
                                  digitalWrite(fan, LOW);//fan ON
                                }
                          
                          }

                       if ((current_time-time1_)>6020000)
                          { lcd.clear();
                            lcd.setCursor(11,0); 
                            lcd.print("END");
                            lcd.setCursor(9,1);
                            lcd.print("PROCESS");
                            digitalWrite(coil, HIGH);//coil pemanas OFF
                            digitalWrite(fan, HIGH);//fan OFF
                          }

    
            }
  if (resetbutton==HIGH)
      { lcd.clear();
        pushed_2=1-pushed_2;
        
      }
      if (pushed_2==HIGH)
            { pushed_1=0;
              digitalWrite(coil, HIGH);//coil pemanas OFF
              digitalWrite(fan, HIGH);//fan OFF
              lcd.setCursor(10,0); 
              lcd.print("PRESS");
              lcd.setCursor(10,1);
              lcd.print("RESET");
              noInterrupts();
              timer0_millis=0;
              interrupts();
            }
Serial.println(time_);
Serial.println(millis());
Serial.println(current_time);



  lcd.setCursor(5,0); 
  lcd.print(T);
  lcd.print("C"); 
  
  lcd.setCursor(0,0);
  lcd.print("T=");
  lcd.print(suhu);
  lcd.print("/");
  

  lcd.setCursor(0,1);
  lcd.print("H=");
  lcd.print(hum,1);
  lcd.print("%");
  delay(1000);
}