led.c

int pinLED =13;

int aPinLed[8] = {13, 12 ,11, 10, 9, 8, 7, 6};

void setup() {
  // put your setup code here, to run once:
  for(int i=0; i<8; i++) {
    pinMode(aPinLed[i], OUTPUT);
  }
}

void loop() {
  // put your main code here, to run repeatedly:
  for(int i=0; i<14; i++) {
    int j;
    if(!(i/8)) j = i;
    else j =  6 - (i % 8); 
    digitalWrite(aPinLed[j], HIGH);
    delay(1000);
    digitalWrite(aPinLed[j], LOW);
  }
}