void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  static unsigned long lastTime = 0;
  if (lastTime + 1000 < millis()) {
    Serial.print("Arduinoen har vært på i ");
    unsigned int seconds = millis()/1000;
    Serial.print(seconds);
    if (seconds > 1) {
      Serial.println(" Sekunder");
    } else {
      Serial.println(" Sekund");
    }
    lastTime += 1000;
  }
}