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volatile unsigned long int timerLED;
unsigned long int timePreview = 0;

unsigned char n = 0;
bool check = false;

void LightDown() {
  digitalWrite(n, LOW);
  n--;
  if (n < 8) {
    n = 11;
  }
}

void LightUp() {
  digitalWrite(n, LOW);
  n++;
  if (n > 11) {
    n = 8;
  }
}

void Changer() {
  if (!check) {
    check = true;
  } else {
    check = false;
  }
}

ISR (TIMER0_COMPA_vect){
  digitalWrite(n, HIGH);
  pinMode(n, OUTPUT);
  timerLED++;
  //if(timerLED - timePreview >= 250){
    timePreview = timerLED;
    
    if (!check) {
      LightDown();
    } else {
      LightUp();
    }
  }
}

void setup() {
  Serial.begin(9600);
  pinMode(2, INPUT_PULLUP);
  attachInterrupt(0, Changer, FALLING);
  n = 11;

  TCCR0A |= (1<<WGM01);
  OCR0A = 0xF9;
  TIMSK0 |= (1<<OCIE0A);
  TCCR0B |= (1<<CS01) | (1<<CS00);
  sei();
}

void loop() {
}