void readSensorData() {
  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();

  if (!isnan(humidity) && !isnan(temperature)) {
    Serial.print("Humidity: ");
    Serial.print(humidity);
    Serial.print(" %\t");
    Serial.print("Temperature: ");
    Serial.print(temperature);
    Serial.println(" °C");
  } else {
    Serial.println("Failed to read from DHT sensor!");
  }
  delay(2000);
}