void setup() {
  // enable outputs
  DDRB = (1<<PB4)|(1<<PB3)|(1<<PB2)|(1<<PB1)|(1<<PB0);
  DDRB = 0b00011111;
  DDRB = 0x1F;
  DDRB = 31;
  // set pins
  //PORTB = (1<<PB4)|(1<<PB3)|(1<<PB2)|(1<<PB1)|(1<<PB0);
  PORTB = 1;
}

void loop() {
  static unsigned char counter = 0;
  PORTB <<= 1;
  delay(1000);
}