int pinLed[] ={0,1,2,3,4,5,6,7};
int i,j;
void chayphaitrai()
{
  static int chay2 = 7;
  for (i=0;i<8;i++)
  digitalWrite(pinLed[i],LOW);
  digitalWrite(pinLed[chay2],HIGH);
  delay(300);
  chay2--;
  if (chay2<-1)
  chay2 = 7;
}
  void setup()
  {
    for(i=0; i<=7;i++)
    pinMode(pinLed[i], OUTPUT);
  }
  void loop()
  {
    chayphaitrai();
  }