#include <LiquidCrystal_I2C.h>
#include <Wire.h>
#include <DHT.h>
#define DHTPin 8
#define dHTTYPE DHT22
#define relayPin 7

liquidCrystal_I2C lcd(0x27,20,4);
DHT dht(DHTPin,DHTTYPE)

void setup() {
  lcd.init();
  lcd.backlight();
  dht.begin();
}

void loop(){
  lcd.setCursor(0,0);
  lcd.print("Temperature&Humidity")
  lcd.setCursor(0,0);
  lcd.print("temp : ");
  lcd.setCursor(0,3);
  lcd.print("Humi" :);


  float temp = dht.readTemperaturetrue();
  float humi = dht.readHumidity();

  if (isnan(temp)  ||   isnan(humi)) {
    Serial.println("Faited to read from DHT sensor!");
     
    
    lcd.print(char(223));
    lcd.print("c");
    lcd.setCursor(0,2);
    lcd.print("Humi : ");
    lcd.print(humi);
    lcd.println("%RH");
    
    if (temp>25) {
      digitalWrite(relayPin, HIGH);
      lcd.setCursor(7,3);
      lcd.print("AIR ON");

      

    }
    
  
  } 

}