pili led來回跑

const int led[]={2,3,4,5,6,7};//一維陣列，const不可更改led[0]內容值
int i,j;
void setup()
{
  // put your setup code here, to run once:
 for(i=0;i<6;i++)
 {
  pinMode(led[i],OUTPUT);
 }
}

void loop()
{
  // put your main code here, to run repeatedly:
 for(j=0;j<6;j++)
 {
  digitalWrite(led[j],HIGH);delay(100);
  digitalWrite(led[j],LOW);
 }
 for(j=4;j>0;j--)
 {
  digitalWrite(led[j],HIGH);delay(100);
  digitalWrite(led[j],LOW);
 }
}

方法二:
const int led[]={2,3,4,5,6,7};
int i;
int j=0;
int way=0;
void setup()
{
 for(i=0;i<6;i++)
 {
  pinMode(led[i],OUTPUT);
 }
}

void loop()
{
  for(i=0;i<6;i++)
  {
    digitalWrite(led[i],LOW);
  }
 
  digitalWrite(led[j],HIGH);delay(500);
  if(way==0)
  {
    j++;
    if(j==5)way=1;
  }
  else
  {
    j--;
    if(j==0)way=0;
  }
}