由左到右閃爍

 int led[]={2,3,4,5,6,7,8,9};

int j=0;

void setup() {

  // put your setup code here, to run once:

  for(int i=0;i<=7;i++)

  {

    pinMode(led[i],OUTPUT);

  }

}

void loop() {

  // put your main code here, to run repeatedly:

  for(int i=0;i<=7;i++)

  {

    digitalWrite(led[i],LOW);

  }

  digitalWrite(led[j],HIGH);  delay(1000);

  digitalWrite(led[j],LOW);

  j++;

  if(j==8) j=0;

}