Arduino Hand in 3

#define BTN   (1 << 1)
#define LED_1 (1 << 2)
#define LED_2 (1 << 3)
#define LED_3 (1 << 4)
#define PIN_LEDS (LED_1 | LED_2 | LED_3)

void setup()
{
  // Set up our serial monitor
  Serial.begin(9600);

  // Set our LEDs as output
  DDRB |= PIN_LEDS;

  // Set our BTN as input
  DDRB &= BTN;

  // Set our button as internal pullup
  PORTB |= BTN;
}

void loop()
{
  int val = analogRead(A0);
  Serial.println(val);

  if(!(PINB & BTN)) {
    PORTB |= LED_1;
    delay(val);

    PORTB |= LED_2;
    delay(val);

    PORTB |= LED_3;
    delay(val);

    PORTB &= ~LED_3;
    delay(val);

    PORTB &= ~LED_2;
    delay(val);

    PORTB &= ~LED_1;
    delay(val);

  } else {
    PINB &= ~PIN_LEDS;
  }
}