int ledpins[]={2,3,4,5,6,7,8,9};
int i;
void setup() 
{
  for (i=0;i<=7;i++)
  {
    pinMode(ledpins[i], OUTPUT);
  }
  // put your setup code here, to run once:

}

void loop() 
{
  for (i=7;i>=0;i--)
  {
    digitalWrite(ledpins[i], HIGH);
    delay(100);
    digitalWrite(ledpins[i], LOW);
  }
    
}
//