 
 // LCD init
 LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
+int backLight = 13;
 
 // PID relay control
 #define RELAY_PIN 7

    lcd.print("C");

    // append "ale" or "lager"
    if ((setPoint >= 7) && (setPoint <= 9)) {
        lcd.print("  (lager)");
    } else if ((setPoint >= 10) && (setPoint < 13+1)) {
        lcd.print(" (lager)");


void setup() {
    lcd.begin(16, 2);
    pinMode(backLight, OUTPUT);
    digitalWrite(backLight, HIGH);
    sensors.begin();
    windowStartTime = millis();

