#define BUTTON_PIN 2

volatile byte a = false;
byte c = 0;

void setup() {
  Serial.begin(115200);
  for (byte b = 8; b < 14; b++) { pinMode(b, OUTPUT); }
    pinMode(BUTTON_PIN, INPUT);
}

void loop() {
  if (digitalRead(BUTTON_PIN)) 
    c = (c + 1) % 6; 
  else { 
    if (c == 0)
      c = 5; 
    else c--;
  };

  r(8 + c);

}

void dd () {
  a = !a;
  Serial.println("pressed!");
}

void r(int l) {
  digitalWrite(l, HIGH);
  delay(500);
  digitalWrite(l, LOW);
}