#include <DHT.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <Keypad.h>
const int ROW_NUM = 4;
const int COLUMN_NUM = 4;
char keys[ROW_NUM][COLUMN_NUM] = {
 {'1','2','3', 'A'},
  {'4','5','6', 'B'},
  {'7','8','9', 'C'},
  {'*','0','#', 'D'}
};

byte rowPins[4] = {'9', '8', '7', '6'};
byte columnPins[4] = { '5', '4','3', '2'};
Keypad keypad = Keypad( makeKeymap(keys), rowPins, columnPins, ROW_NUM, COLUMN_NUM );

LiquidCrystal_I2C lcd(0x27, 16, 2);
int DHTPIN = 13;
int DHTTYPE = 22;
DHT dht(DHTPIN,DHTTYPE);

void setup() {
  Serial.begin(9600); 
  dht.begin();
  lcd.init();
  lcd.backlight();

}

void loop() {
  float t = readTemperature();
  float h = readHumidity();
  float f = readTemperature(true);
  char key = keypad.getKey();
  if (key == '1'){
   lcd.setCursor(0,0);
  lcd.print("Nhiet do: ");
  lcd.print(t);
  delay(1000);
  lcd.clear();
  }
  if (key == '2'){
  lcd.setCursor(0,1);
  lcd.print("Do am: ");
  lcd.print(h);
  delay(1000);
  lcd.clear();
  }
  }