int LED[] = {0,1,2,3,4};
int LED5 = 5;
int i;

void setup() 
{
pinMode(LED[0], OUTPUT);
pinMode(LED[1], OUTPUT);
pinMode(LED[2], OUTPUT);
pinMode(LED[3], OUTPUT);
pinMode(LED[4], OUTPUT);
}

void loop() 
{
  //LED leuchten 0 bis 4
  for(i=0;i<=4;i++)
  {
    digitalWrite(LED[i], HIGH);
    delay(100);
    digitalWrite(LED[i], LOW);
  }
  
  //LED aufblinken
  for(i=0;i<=4;i++)
    {
      delay(200);
      digitalWrite(LED[i], HIGH);
      delay(50);
      digitalWrite(LED[i], LOW);
    }
       delay(300);

    //LED leuchten 4 bis 0
    for(i=4;i>=0;i--)
  {
    digitalWrite(LED[i], HIGH);
    delay(100);
    digitalWrite(LED[i], LOW);
  }

 //LED aufblinken
  for(i=0;i<=4;i++)
    {
      delay(200);
      digitalWrite(LED[i], HIGH);
      delay(50);
      digitalWrite(LED[i], LOW);
    }
    delay(300);
}