int bewegungssensor = 15;                       
int bewegungsStatus = 0;
int alarmLED = 5;                               
int alarmLED2 = 18;                             
int alarmBuzzer = 2;                            


void setup()
{
  pinMode(alarmLED2, OUTPUT);                   
  pinMode(alarmLED, OUTPUT);                    
  pinMode(alarmBuzzer, OUTPUT);                 
  pinMode(bewegungssensor, INPUT);              
  Serial.begin(9600);                           
}

void loop()
{
  alarm();

}
void alarm()
{
  bewegungsStatus = digitalRead(bewegungssensor);


  if (bewegungsStatus == HIGH)
  {
    Serial.print("Alarm");
    for (int i = 0; i < 3; i++)
    {
      digitalWrite(alarmLED, HIGH);
      digitalWrite(alarmLED2, HIGH);
      digitalWrite(alarmBuzzer, HIGH);
      delay(500);
      digitalWrite(alarmLED, LOW);
      digitalWrite(alarmLED2, LOW);
      digitalWrite(alarmBuzzer, LOW);
      delay(500);

    }
  }
}