#include <LiquidCrystal_PCF8574.h>
#include <DHT.h>

LiquidCrystal_PCF8574 lcd(0x27);

#define DHTPIN 4

#define DHTTYPE DHT22

DHT dht(DHTPIN,DHTTYPE);

char grados = 223;

void setup() {
  dht.begin();
  
  lcd.begin(20, 4);
  delay(200);
  lcd.setBacklight(255);
  lcd.print("Humedad:");
  lcd.setCursor(0,1);
  lcd.print("Temperatura:");
}

void loop() {
  float h = dht.readHumidity();
  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,0);
  lcd.print("%   ");
  lcd.setCursor(13,1);
  lcd.print(t,0);
  lcd.print((char)grados);
  lcd.print("C    ");

  
}