#include "DHT.h"
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,20,4);
#define DHTPIN 2     
#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321
const int relayPin = 13;

DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(115200);
  Serial.println(F("DHT22 example!"));
  pinMode(relayPin, OUTPUT);
  dht.begin();

  
  lcd.init();                      // initialize the lcd
  // Print a message to the LCD.
  lcd.backlight();
  lcd.setCursor(3,0);
  lcd.print("Hello, world!");
  lcd.setCursor(2,1);
  delay(2000);


}

void loop() {

  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();
  
  if(temperature>25){
  digitalWrite(relayPin, HIGH);
  lcd.clear();
  lcd.setCursor(0,2);
  lcd.print("Pong tai");
  
  }
   if(temperature<24){
    digitalWrite(relayPin, LOW);
  }

  // Check if any reads failed and exit early (to try again).
  if (isnan(temperature) || isnan(humidity)) {
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }

  Serial.print(F("Humidity: "));
  Serial.print(humidity);
  Serial.print(F("%  Temperature: "));
  Serial.print(temperature);
  Serial.println(F("°C "));

  // Wait a few seconds between measurements.
  delay(2000);
}