void setup() {

  // put your setup code here, to run once:

  DDRD = 0xFF;      //Configura todos los pines del puerto D como salidas

}

 

void loop() {

  // put your main code here, to run repeatedly:

  PORTD = 255;      //PORTD = 0xFF; PORTD = 0b11111111;

  delay(1000);

  PORTD = 0;        //PORTD = 0x00; PORTD = 0b00000000;

  delay(1000);

  PORTD = 170;      //PORTD = 0xAA; PORTD = 0b10101010;

  delay(1000);

  PORTD = 85;       //PORTD = 0x55; PORTD = 0b01010101;

  delay(1000);

  PORTD = 0;        //PORTD = 0x00; PORTD = 0b00000000;

  delay(1000);

}