Revisiting the first circuit with Arduino

void setup()
{
  // use a for loop to initialise each pin as an output:
  for (int thisPin = 9; thisPin < 14; thisPin++) {
    pinMode(thisPin, OUTPUT);
  }

}

void loop()
{
  // another for loop to turn a pins ON and OFF
  // this time thiPin is decreasing (--)
  for (int thisPin = 13; thisPin > 8; thisPin--) {
    // turn the pin on:
    digitalWrite(thisPin, HIGH);
    delay(500);
    // turn the pin off:
    digitalWrite(thisPin, LOW);
  }

}