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

LiquidCrystal_I2C lcd(0x27,16,2);  

//========================================== DHT
#include <Adafruit_Sensor.h>
#include <DHT.h>
#include <DHT_U.h>
#define DHTPIN 10   

//#define DHTTYPE    DHT11     // DHT 11
#define DHTTYPE    DHT22     // DHT 22 (AM2302)
DHT_Unified dht(DHTPIN, DHTTYPE);
sensors_event_t event;
uint32_t delayMS;
float temp,humid;

//========================================== CONST PIN
int rly1Fan=13, rly2AC=12, ledG=4, ledR=3;
float flagMasa=0, saat=0;

//========================================== SETUP
void setup()
{ lcd.init();                      
  lcd.backlight();
  dht.begin();
  initDHT();
  timerInit();
  Serial.begin(9600);

  pinMode(rly1Fan,OUTPUT);
  pinMode(rly2AC,OUTPUT); 
  pinMode(ledG,OUTPUT);
  pinMode(ledR,OUTPUT);
  lcd.clear();
}

float an,treshold;
void loop()
{ readPOT();
  sensors_event_t event;

  //================================================================ Read Temp
  dht.temperature().getEvent(&event);
  lcd.setCursor(0,0);
  lcd.print("T:");  lcd.print(event.temperature,1);       lcd.print("C");

  lcd.setCursor(8,1);
  Serial.print("Temperature: ");  Serial.print(event.temperature,1);
  Serial.print("   Treshold: ");  Serial.println(treshold);
  // if(treshold>event.temperature)  { FANon(); ledRon(); lcd.print("Mode:FAN"); }
  // if(treshold<=event.temperature) { ACon();  ledGon(); lcd.print("Mode:AC "); }
  if(flagMasa==0)                 { flagMasa=0; FANon(); ledRon(); lcd.print("Mode:FAN"); saat=0; }
  if(treshold<=event.temperature) { flagMasa=1; ACon();  ledGon(); lcd.print("Mode:AC "); }
  if(saat>=3600) flagMasa=0;

  //================================================================ Read Humid
  dht.humidity().getEvent(&event);
  lcd.setCursor(0,1);
  if(flagMasa==0) { lcd.print("H:");  lcd.print(event.relative_humidity,1); lcd.print("%"); }
  if(flagMasa==1) { lcd.print("T:");  lcd.print(((3600-saat)/60),0); lcd.print("min"); }
}

void ACon()   { digitalWrite(rly2AC,HIGH);  digitalWrite(rly1Fan,LOW);  }
void FANon()  { digitalWrite(rly2AC,LOW);   digitalWrite(rly1Fan,HIGH); }
void ledGon() { digitalWrite(ledG,HIGH);    digitalWrite(ledR,LOW);     }
void ledRon() { digitalWrite(ledG,LOW);     digitalWrite(ledR,HIGH);    }

void readPOT()
{ an = analogRead(A0);
  treshold = map(an,0,1023,15,30);
  lcd.setCursor(8,0);
  lcd.print("TH:");
  lcd.print(treshold,1);
  lcd.print("C");
}
void initDHT()
{ sensor_t sensor;
  dht.temperature().getSensor(&sensor);
  dht.humidity().getSensor(&sensor);
  delayMS = sensor.min_delay / 1000;
}

void timerInit()
{ // TIMER 1 for interrupt frequency 1 Hz:
  cli(); // stop interrupts
  TCCR1A = 0; // set entire TCCR1A register to 0
  TCCR1B = 0; // same for TCCR1B
  TCNT1  = 0; // initialize counter value to 0
  // set compare match register for 1 Hz increments
  OCR1A = 62499; // = 16000000 / (256 * 1) - 1 (must be <65536)
  // turn on CTC mode
  TCCR1B |= (1 << WGM12);
  // Set CS12, CS11 and CS10 bits for 256 prescaler
  TCCR1B |= (1 << CS12) | (0 << CS11) | (0 << CS10);
  // enable timer compare interrupt
  TIMSK1 |= (1 << OCIE1A);
  sei(); // allow interrupts
}

ISR(TIMER1_COMPA_vect)
{ if(flagMasa==1)
  { saat++;
    Serial.println(saat);
  }
}