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

   }
   void loop()
   {
    trongngoai();
   }