Arduino KnightRider effect more realistic and accurate with 8 Leds and 1 Pot

KnightRider-more-realistic.ino

/**
 * I recently buy my first Arduino board, and looking for something to build I found
 * in the Arduino tutorials page a funny KnightRider effect with some leds, I really
 * love more realistic and accuracy things so... I build this more accurate effect
 * in the memory of our lovely Michael Knight and KIT!
 */

// PWM Pins
const int L1 = 2;
const int L2 = 3;
const int L3 = 4;
const int L4 = 5;
const int L5 = 6;
const int L6 = 7;
const int L7 = 8;
const int L8 = 9;

// 10K Pot
const int POT = A0;

// Leds with R220 Ohms
int leds[] = {L1, L2, L3, L4, L5, L6, L7, L8};
int bright;
int timer = 10;
int l;

void setup()
{
  pinMode(L1, OUTPUT);
  pinMode(L2, OUTPUT);
  pinMode(L3, OUTPUT);
  pinMode(L4, OUTPUT);
  pinMode(L5, OUTPUT);
  pinMode(L6, OUTPUT);
  pinMode(L7, OUTPUT);
  pinMode(L8, OUTPUT);
}

void loop()
{
  bright = map(analogRead(POT), 0, 1023, 0, 255);

  l = 0;
  analogWrite(leds[l], bright);
  delay(timer + bright);
  analogWrite(leds[l + 1], bright);
  delay(timer + bright);

  for (l = 0; l < 6; l++)
  {
    analogWrite(leds[l], bright);
    delay(timer);
    analogWrite(leds[l + 1], bright);
    delay(timer);
    analogWrite(leds[l + 2], bright);
    delay(timer);

    for (int i = bright; i >= 0; i--)
    {
      analogWrite(leds[l], i);
      delay(timer / 10);
    }
  }

  for (int i = bright; i >= 0; i--)
  {
    analogWrite(leds[l], i);
    delay(timer / 10);
  }

  l = 7;
  analogWrite(leds[l], bright);
  delay(timer + bright);
  analogWrite(leds[l - 1], bright);
  delay(timer + bright);

  for (l = 7; l > 1; l--)
  {
    analogWrite(leds[l], bright);
    delay(timer);
    analogWrite(leds[l - 1], bright);
    delay(timer);
    analogWrite(leds[l - 2], bright);
    delay(timer);

    for (int i = bright; i >= 0; i--)
    {
      analogWrite(leds[l], i);
      delay(timer / 10);
    }
  }

  for (int i = bright; i >= 0; i--)
  {
    analogWrite(leds[l], i);
    delay(timer / 10);
  }
}