Knight Rider LED's Variable Speed

//Knight Rider Variable Speed
 
  int pinArray[] = {0,2,3,4,5,6,7,8,9,10,11,12,13,19,18,17,16,0}; // Increase zeros at end of array for pause.
  int pinCount = 18;
  int activePin = 2;
  int dx = 1;
  int pot = 0;
  int mintime = 0;
 
  void setup() {
 
  Serial.begin(9600);
  
  for (int i=0; i< pinCount; i++) {
    if (pinArray[i] != 0) {
      pinMode(pinArray[i], OUTPUT);
    }
  }
}
 

void loop() {
 
  for (int i=0; i<pinCount; i++) {
    digitalWriteNot0(pinArray[i], LOW);
  }
 
    if (activePin == (pinCount-1)) {
    activePin = (pinCount - 2);
    dx = -1;
  }
 
   if (activePin == 0) {
    activePin = 1;
    dx = 1;
  }
 
   activePin += dx;
   pot = analogRead(0);
 
   if (pot < 1023) {
    
    digitalWriteNot0(pinArray[activePin], HIGH);
   
   // digitalWriteNot0(pinArray[activePin-dx], HIGH); // Remove for less active LEDs
    
   // digitalWriteNot0(pinArray[activePin-2*dx], HIGH); // Remove for less active LEDs
    }
 
  Serial.print(pot);
  Serial.print(" - ");
  Serial.println(activePin);
 
  delay(mintime+analogRead(0)/4);
 
}
 
void digitalWriteNot0(int pin, boolean state) {
  if (pin > 0) {
    digitalWrite(pin, state);
  }
}