int temp = rand() % 1000 + 2000;
int direction = 1;

void setup() {
  Serial.begin(115200);
  pinMode(13, OUTPUT);
}

void loop() {
  int temphigh = analogRead(15) + 100;
  int templow = analogRead(15) - 100;

  Serial.println();
  Serial.print("Temp = ");
  Serial.println(temp);
  Serial.print("Temp high = ");
  Serial.println(temphigh);
  Serial.print("Temp low = ");
  Serial.println(templow);

  if (temp >= temphigh) {
    direction = -1;
    Serial.println("Det er koldt.");
  } else if (temp <= templow) {
    direction = 1;
    Serial.println("Det er varmt.");
  } else {
    Serial.println("Det er lunt");
  }

  if (direction == -1) {
    digitalWrite(13, LOW);
  } else if (direction == 1) {
    digitalWrite(13, HIGH);
  }

  temp += direction * (rand() % 20 + 10); // Gradually adjust temp

  delay(500);
}