manual

void setup()
{
  DDRD = B11110000; // set PORTD (digital 7~0) to outputs
}

void loop()
{
  PORTD = B11110000; // digital 4~7 HIGH, digital 3~0 LOW
  delay(100);
  PORTD = B01110000;
  delay(100);            // digital 4~7 LOW, digital 3~0 HIGH
  PORTD = B00110000;
  delay(100);
  PORTD = B00010000;
  delay(100);
  PORTD = B00000000;
  delay(100);
  PORTD = B00010000;
  delay(100);
  PORTD = B00110000;
  delay(100);
  PORTD = B01110000;
  delay(100);
  PORTD = B11110000;
  delay(100);

}