#include <LiquidCrystal_I2C.h>
#include <DHT.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);
DHT dht(2, DHT22);

void setup() {
  lcd.init();
  lcd.backlight();
  dht.begin();
  lcd.setCursor(0, 0);
  lcd.print("serus");

  pinMode(11, INPUT);
  Serial.begin(9600);
}

void loop() {

  bool state = digitalRead(11);

  if (state == 1) {
    lcd.setCursor(0, 1);
    float t = dht.readTemperature();
    lcd.print(t);
    Serial.println(t);
  } else {
    lcd.clear();
  }
}