byte ledPin[] = {6, 7, 8, 9, 10, 11, 12};
int direction = 1;
int currentLED = 0;
unsigned long changeTime;
#define pot A5

void setup() {
  // put your setup code here, to run once:
  for(int x = 0; x < 7; x++) {
      pinMode(ledPin[x], OUTPUT);
  }
  changeTime = millis();
    pinMode(pot, INPUT);
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  int valuePot = analogRead(pot);
  Serial.println(valuePot);
  if((millis() - changeTime) > valuePot) {
    changeLED();
    changeTime = millis();
  }
}

void changeLED() {
  for(int x = 0; x < 7; x++) {
      digitalWrite(ledPin[x], LOW);
  }
  digitalWrite(ledPin[currentLED], HIGH);
  currentLED += direction;
  if(currentLED == 6) { direction = -1; }
  if(currentLED == 0) { direction = 1; }
}