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

#define DHTPIN 2
#define DHTTYPE DHT22

DHT sensor(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(0x27, 16, 2);

int rele = 5;
String estado = "";

void setup() {
  pinMode(rele, OUTPUT);
  sensor.begin();
  lcd.init();
  lcd.backlight();
}

void loop() {
  float humedad = sensor.readHumidity();
  float temperatura = sensor.readTemperature();

  if (isnan(temperatura) || isnan(humedad)) {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Error sensor DHT");
    delay(2000);
    return;
  }

  if (temperatura <= 37.1) {
    digitalWrite(rele, HIGH);
    estado = "Encendido";
  } else {
    digitalWrite(rele, LOW);
    estado = "Apagado";
  }

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("T:");
  lcd.print(temperatura, 1);
  lcd.print((char)223);
  lcd.print("C ");

  lcd.print("H:");
  lcd.print(humedad, 1);
  lcd.print("%");
  lcd.setCursor(0, 1);
  lcd.print(estado);

  delay(1000);
}