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

LiquidCrystal_I2C lcd(0x27,16,2);

const int DHTPIN = 2;
const int DHTTYPE = DHT22;
DHT dht(DHTPIN, DHTTYPE);
const int buzzer = 11;
byte led1 = 13;
byte led2 = 12;

byte degree[8] = 
{
  0B01110,
  0B01010,
  0B01110,
  0B00000,
  0B00000,
  0B00000,
  0B00000,
  0B00000
};

void setup() 
{
  lcd.init();  
  lcd.backlight();

  pinMode(buzzer, OUTPUT);
  
  lcd.print("Nhiet do: ");
  lcd.setCursor(0,1);
  lcd.print("Do am: ");
  
  lcd.createChar(1, degree);

  dht.begin();  
}

void loop() 
{
  float h = dht.readHumidity();
  float t = dht.readTemperature();

  if (isnan(t) || isnan(h)) {} 
  else 
  {
    lcd.setCursor(10,0);
    lcd.print(round(t));
    lcd.print(" ");
    if(t>=0)
    {
    lcd.setCursor(12,0);
    lcd.print(" ");
    }
    lcd.setCursor(14,0);
    lcd.write(1);
    lcd.print("C");

    lcd.setCursor(10,1);
    lcd.print(round(h));
    if(h<100)
    {
    lcd.setCursor(12,1);
    lcd.print(" ");
    }
    lcd.setCursor(14,1);
    lcd.print(" %");    
  }
  if (t > 30)
  {
    digitalWrite(led1, 1);
    tone(buzzer, 1000); // Send 1KHz sound signal...
    delay(1000);        // ...for 1 sec
    noTone(buzzer);     // Stop sound...
    delay(1000);        // ...for 1sec
  }
  else
  {
    digitalWrite(led1, 0);
  }
  if (h <= 50)
  {
    digitalWrite(led2, 1);
    tone(buzzer, 1000); // Send 1KHz sound signal...
    delay(1000);        // ...for 1 sec
    noTone(buzzer);     // Stop sound...
    delay(1000);        // ...for 1sec
  }
  else
  {
    digitalWrite(led2, 0);
  }
}