#include <LiquidCrystal_PCF8574.h>

#include <DHT.h>

LiquidCrystal_PCF8574 lcd(0x27);

#define DHTPIN 0

#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321

DHT dht(DHTPIN, DHTTYPE);

char grados = 223;

void setup() {

  // put your setup code here, to run once:

  dht.begin();

  lcd.begin(20, 4); // initialize the lcd

  delay(200);

  lcd.setBacklight(255);

  lcd.print("Humedad:");

  lcd.setCursor(0, 1);

  lcd.print("Temperatura:");

}

void loop() {

  // put your main code here, to run repeatedly:

  // 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();

  if (isnan(h) || isnan(t)) {

    lcd.setCursor(13, 0);

    lcd.print("error!");

    lcd.setCursor(13, 1);

    lcd.print("error!");

    return;

  }

  lcd.setCursor(13, 0);

  lcd.print(h, 1);

  lcd.print("% ");

  lcd.setCursor(13, 1);

  lcd.print(t, 1);

  lcd.print(grados);

  lcd.print("C ");

  delay(1000);

}