bool alreadyRun[3];
int ledPin=12;
void setup()
{
  alreadyRun[0]=false;
  alreadyRun[1]=false;
  alreadyRun[2]=false;
  alreadyRun[3]=false;
  Serial.begin(9600);
  pinMode(ledPin,OUTPUT);
}

void loop()
{
  while (alreadyRun[0] == false)
  {
    aFunction(12,1);
  }
  delay(1000);
}

void aFunction(int D_Pin, bool x)
{
  
  if (alreadyRun[x] == false)
  {
    
  digitalWrite(ledPin,HIGH);
  delay(1000);
  digitalWrite(ledPin,LOW);
  delay(1000);
  Serial.print('\n'); 
  Serial.print(ledPin); 
  Serial.println(" door open");
  alreadyRun[x] = true;
  }
}