void setup() {
  // put your setup code here, to run once:
 //DDRD = 0b10000000;
 DDRD = 0b10001000;
 
}

void loop() {
  // put your main code here, to run repeatedly:
//PORTD = 0b10000000;
PORTD = 0b10001000;

delay(500);

PORTD = 0b10000000;

delay(500);

}