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

double input;     // current temperature
double output;    // for PID
PID myPID(&input, &output, &setPoint, 2, 5, 1, REVERSE);
int windowSize = 5*60*1000;  // 5 minutes in ms
unsigned long windowStartTime;

// pot

    lcd.print("C");

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