LEDS_and_inputs.ino

const int leds[] = {9, 10, 11, 12, 13};
const int NUMLEDS = 5;

const int knobPin = A5;
const int button1 = 7;
const int button2 = 8;

int loopStep = 1;
int i = 0;

void setup() {
  // put your setup code here, to run once:
  for (int i = 0; i < NUMLEDS; i++){
    pinMode(leds[i], OUTPUT);
    digitalWrite(leds[i], LOW);
  }
  pinMode(knobPin, INPUT);
  pinMode(button1, INPUT_PULLUP);
  pinMode(button2, INPUT_PULLUP);
}

void loop() {
  // put your main code here, to run repeatedly:
  
  digitalWrite(leds[i], HIGH);
  delay(analogRead(knobPin));
  digitalWrite(leds[i], LOW);
  i = (i + loopStep) % NUMLEDS;
  if (i < 0) i = NUMLEDS-1;

  if (digitalRead(button1) == LOW) loopStep = -1;
  if (digitalRead(button2) == LOW) loopStep = 1;
  

}