/*
 * Blink
 *
 * The basic Arduino example.  Turns on an LED on for one second,
 * then off for one second, and so on...  We use pin 13 because,
 * depending on your Arduino board, it has either a built-in LED
 * or a built-in resistor so that you need only an LED.
 *
 * http://www.arduino.cc/en/Tutorial/Blink
 */

int ledPin = 13;                // LED connected to digital pin 13

void setup()                    // run once, when the sketch starts
{
  int i;
  pinMode(ledPin, OUTPUT);      // sets the digital pin as output
  for(i = 8; i <= 12; i++) {
      pinMode(i, OUTPUT);
  }
}

void loop()                     // run over and over again
{
  int i;
  
  
  
  for(i = 8; i <= 12; i++) {
    digitalWrite(i, HIGH);
    delay(37);                  

    digitalWrite(i, LOW);
    delay(37);                 
  }
  
  digitalWrite(ledPin, HIGH);   // sets the LED on
  
  for(i = 11; i > 8; i--) {
       digitalWrite(i, HIGH);
    delay(37);                 

    digitalWrite(i, LOW);
    delay(37);                 
  }
  
  digitalWrite(ledPin, LOW);    // sets the LED off
}