#include "DHT.h"
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
#define DHTPIN 2    
#define DHTTYPE DHT22  
#define led1 13
#define led2 12
#define led3 11
DHT dht(DHTPIN, DHTTYPE);


void setup() 
{
  lcd.init();
  lcd.backlight();
  Serial.begin(9600);
  lcd.setCursor(0,0);
  lcd.print("Temperature &");
  lcd.setCursor (8,1);
  lcd.print("Humidity");
  delay(2000);
  lcd.clear();
  dht.begin();
}

void loop() {
  delay(1000);
  float h = dht.readHumidity();
  float t = dht.readTemperature();
  
  if (isnan(h) || isnan(t) ) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  if (t > 40)
  {
    lcd.clear();
    digitalWrite(led3, HIGH);
    digitalWrite(led2, LOW);
    digitalWrite(led1, LOW);
    lcd.print("Temp : ");
    lcd.print(t);
    lcd.print("C");
    lcd.setCursor(0,1);
    lcd.print("Hum : ");
    lcd.print(h);
    lcd.print("%");
    lcd.setCursor(0,2);
  }
  if(t <= 40)
  {
    lcd.clear();
    digitalWrite(led3, LOW);
    digitalWrite(led2, HIGH);
    digitalWrite(led1, LOW);
    lcd.print("Temp : ");
    lcd.print(t);
    lcd.print("C");
    lcd.setCursor(0,1);
    lcd.print("Hum : ");
    lcd.print(h);
    lcd.print("%");
    lcd.setCursor(0,2);
  }
  if (t <= 25)
  {
    lcd.clear();
    digitalWrite(led3, LOW);
    digitalWrite(led2, LOW);
    digitalWrite(led1, HIGH);
    lcd.print("Temp : ");
    lcd.print(t);
    lcd.print("C");
    lcd.setCursor(0,1);
    lcd.print("Hum : ");
    lcd.print(h);
    lcd.print("%");
    lcd.setCursor(0,2);
  }

  Serial.print("Temperature: ");
  Serial.print(t );
  Serial.print(" C\t");
  Serial.print("Humidity: ");
  Serial.print(h);
  Serial.println(" %");
}