void setup() {
  // put your setup code here, to run once:
  for(int i = 2; i <= 8; i++){
    pinMode(i, OUTPUT);
  }
}

void loop() {
  // put your main code here, to run repeatedly:
  for(int i = 2; i <= 8; i++){
    digitalWrite(i, HIGH);
    delay(1000);
    digitalWrite(i, LOW);
  }
}