void setup() {
  // put your setup code here, to run once:
  // 2-bt2, 3-bt1
  // 9 10 11 12 13 left to right
  
  int i;
  for (i=9;i<13;i++) {
    pinMode(i, OUTPUT);
  }

  pinMode(2, INPUT);
  pinMode(3, INPUT);
}

void light(int mode) {
  int i;
  if (mode == HIGH) { // button 1
    for (i=9;i<13;i++) {
      digitalWrite(i, HIGH);
      delay(200);
      digitalWrite(i, LOW);
    }
  } else { // button 2
    for (i=13;i>9;i--) {
      digitalWrite(i, HIGH);
      delay(200);
      digitalWrite(i, LOW);
    }
  }
}
void loop() {
  // put your main code here, to run repeatedly:

  int inputProcessed = 0;
  int button1 = digitalRead(3);
  int button2 = digitalRead(2);

  int i;
  if (digitalRead(3) == HIGH) {
        for (i=9;i<=13;i++) {
          digitalWrite(i, HIGH);
          delay(200);
          digitalWrite(i, LOW);
        }
  } else if (digitalRead(2) == HIGH) {
        for (i=13;i>=9;i--) {
            digitalWrite(i, HIGH);
            delay(200);
            digitalWrite(i, LOW);
        }
  }

  delay(100);
}