// LED 8개 제어
// 왼쪽에서 오른쪽으로 차례대로 켜기

/*
#define LED0 2
#define LED1 3
#define LED2 4
#define LED3 5
#define LED4 6
#define LED5 7
#define LED6 8
#define LED7 9
*/

// const int LED0 = 2;

int LED[N] = {2, 3, 4, 5, 6, 7, 8, 9};

void setup() {
  for(int i = 0; i < N; i++) {
    pinMode(LED[i], OUTPUT);
  }
}

void loop() {
  digitalWrite(LED7, LOW);
  digitalWrite(LED6, LOW);
  digitalWrite(LED5, LOW);
  digitalWrite(LED4, LOW);
  digitalWrite(LED3, LOW);
  digitalWrite(LED2, LOW);
  digitalWrite(LED1, LOW);
  digitalWrite(LED0, LOW);

  digitalWrite(LED7, HIGH);
  delay(500);
  digitalWrite(LED6, HIGH);
  delay(500);
  digitalWrite(LED5, HIGH);
  delay(500);
  digitalWrite(LED4, HIGH);
  delay(500);
  digitalWrite(LED3, HIGH);
  delay(500);
  digitalWrite(LED2, HIGH);
  delay(500);
  digitalWrite(LED1, HIGH);
  delay(500);
  digitalWrite(LED0, HIGH);
  delay(500);
}