Knight Rider led simulation for Arduino

gistfile1.ino

/*
  Knight Rider led simulation for Arduino
  By Antonio Perez <aperez@skarcha.com>

  Public Domain
*/
const int analogInPin = A0;
const int ledPins[] = {3, 5, 6, 9, 10, 11};
const int pinCount = 6;
const int brightAmount = (255 / (pinCount / 3));

int sensorValue = 0;
int timer = 20;
int bright = 0;

void setup() {
  for (int thisPin = 0; thisPin < pinCount; thisPin++)  {
    pinMode(ledPins[thisPin], OUTPUT);      
  }
}

void setBright (int led) {
  analogWrite(ledPins[led], bright);
  bright -= brightAmount;
  if (bright < 0) {
    bright = 0;
  }
}

void loop() {
  int i = 0;

  sensorValue = analogRead (analogInPin);
  timer = map(sensorValue, 0, 1023, 20, 1000);

  // loop from the lowest pin to the highest:
  for (int thisPin = 0; thisPin < pinCount; thisPin++) {
    i = thisPin;
    bright = 255;
    while (i >= 0) {
      setBright(i);
      i--;
    }
    delay(timer);                  
  }

  // loop from the highest pin to the lowest:
  for (int thisPin = pinCount - 1; thisPin >= 0; thisPin--) { 
    i = thisPin;
    bright = 255;
    while (i < pinCount) {
      setBright(i);
      i++;
    }
    delay(timer);                  
  }
}