int pinled;
int pausaIda=500;
int pausaVuelta=500;
void setup() 
{
pinMode(13, OUTPUT);
pinMode(12, OUTPUT);
pinMode(11, OUTPUT);
pinMode(10, OUTPUT);
pinMode(9, OUTPUT); 
}
void loop() 
{
 for (pinled = 9; pinled <= 13; pinled++) 
  { 
    digitalWrite(pinled, HIGH);   
    delay(pausaIda);                  
    digitalWrite(pinled, LOW);    
  }
       
for (pinled = 13; pinled >= 9; pinled--) 
  { 
     digitalWrite(pinled, HIGH);   
     delay(pausaVuelta);                  
     digitalWrite(pinled, LOW);    
  }
} 
