const int relay1Pin = 8;
const int relay2Pin = 4;
const int ldrPin = A0;
const int ntcPin = A1;
const int lcdRS = 12; 
const int lcdEN = 11;
const int lcdD4 = 5; 
const int lcdD5 = 4;
const int lcdD6 = 3; 
const int lcdD7 = 2; 

#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  pinMode(relay1Pin, OUTPUT);
  pinMode(relay2Pin, OUTPUT);
  pinMode(ldrPin, INPUT);
  pinMode(ntcPin, INPUT);
  lcd.init(); 
  lcd.backlight();  
}

void loop() {
  int ldrValue = analogRead(ldrPin); 
  int ntcValue = analogRead(ntcPin); 

  float temperature = (ntcValue * 5.0 / 1023.0 - 0.5) * 100.0;

  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(temperature);
  lcd.print(" C");

  if (ldrValue < 400) {  
    digitalWrite(relay1Pin, HIGH);
    digitalWrite(relay2Pin, LOW);
  } else {
    digitalWrite(relay1Pin, LOW);
    digitalWrite(relay2Pin, HIGH);
  }

  delay(500); 
}