//case 2 : active high
#define LED0 13
int LED1 = 12;
int LED2 = 11;
int LED3 = 10;
int LED4 = 9;
int LED5 = 8;
int LED6 = 7;
int LED7 = 6;

void setup() {
  // put your setup code here, to run once:
  pinMode(LED0, OUTPUT);
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(LED3, OUTPUT);
  pinMode(LED4, OUTPUT);
  pinMode(LED5, OUTPUT);
  pinMode(LED6, OUTPUT);
  pinMode(LED7, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(LED0, HIGH);
  delay(500);
  digitalWrite(LED0, LOW);
  delay(500);

  digitalWrite(LED1, HIGH);
  delay(500);
  digitalWrite(LED1, LOW);
  delay(500);

  digitalWrite(LED2, HIGH);
  delay(500);
  digitalWrite(LED2, LOW);
  delay(500);

  digitalWrite(LED3, HIGH);
  delay(500);
  digitalWrite(LED3, LOW);
  delay(500);

  digitalWrite(LED4, HIGH);
  delay(500);
  digitalWrite(LED4, LOW);
  delay(500);

  digitalWrite(LED5, HIGH);
  delay(500);
  digitalWrite(LED5, LOW);
  delay(500);

  digitalWrite(LED6, HIGH);
  delay(500);
  digitalWrite(LED6, LOW);
  delay(500);

  digitalWrite(LED7, HIGH);
  delay(500);
  digitalWrite(LED7, LOW);
  delay(500);
}