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

#define I2C_ADDR    0x27
#define LCD_COLUMNS 16
#define LCD_LINES   2
LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);

#define DHTPIN 2  
#define DHTTYPE DHT22 
DHT dht(DHTPIN, DHTTYPE);

byte degreeChar[] = {
  B00110,
  B01001,
  B01001,
  B00110,
  B00000,
  B00000,
  B00000,
  B00000
};

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  Serial.println(F("DHTxx test!"));

  lcd.init();
  lcd.createChar(0, degreeChar);
  lcd.backlight();  

  dht.begin();
}

void loop() {
  // put your main code here, to run repeatedly:
  delay(2000);

  // Reading temperature or humidity takes about 250 milliseconds!
  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
  float h = dht.readHumidity();
  // Read temperature as Celsius (the default)
  float t = dht.readTemperature();
  // Read temperature as Fahrenheit (isFahrenheit = true)
  float f = dht.readTemperature(true);
 // Check if any reads failed and exit early (to try again).

  if (isnan(h) || isnan(t) || isnan(f)) {
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }

  // Compute heat index in Fahrenheit (the default)
  float hif = dht.computeHeatIndex(f, h);
  // Compute heat index in Celsius (isFahreheit = false)
  float hic = dht.computeHeatIndex(t, h, false);

  Serial.print(F("Humidity: "));
  Serial.print(h);
  Serial.print(F("%  Temperature: "));
  Serial.print(t);
  Serial.print(F("°C "));
  Serial.print(f);
  Serial.print(F("°F  Heat index: "));
  Serial.print(hic);
  Serial.print(F("°C "));
  Serial.print(hif);
  Serial.println(F("°F"));

  lcd.setCursor(0, 0);
    lcd.print("HR  : "); lcd.print(h, 1); lcd.print("%");
  lcd.setCursor(0, 1);
    lcd.print("Temp: "); lcd.print(t, 1); lcd.write(0); lcd.print("C"); 
}