void loop() {

  //button
  downPinState = digitalRead(downPin);
  selectPinState = digitalRead(selectPin);
  upPinState = digitalRead(upPin);


  if(downPinState == HIGH)
  {
    UI_Level--;
  }
  if(upPinState == HIGH)
  {
    UI_Level++;
  }
  if(UI_Level > 3)
  {
    UI_Level = 3;
  }
  if(UI_Level < 0)
  {
    UI_Level = 0;
  }

  //DHT
    h = dht.readHumidity();
    // Read temperature as Celsius (the default)
    t = dht.readTemperature();
    // Read temperature as Fahrenheit (isFahrenheit = true)
    f = dht.readTemperature(true);

    if (isnan(h) || isnan(t) || isnan(f))
    {
    Serial.println("Failed to read from DHT sensor!");
    delay(2000);
    return;
    }

  //LSM303
  compass.read();

  heading = compass.heading();
  switch(UI_Level)
  {
    case 0:
    temperatureHumidity();
    Serial.println("temp called");
    break;
    case 1:
    watch();
    break;
    case 2:
    magCompass();
    Serial.println("mag called");
    break;
  }

}