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

}
void loop()
{
  ngoaitrong();
}