// Knight Rider
const int LED_MAX = 8;
const int LED[LED_MAX] = {2, 3, 4, 5, 6, 7, 8, 9}; // 8 LEDs
const int POTI = A1; // Poti für Geschwindigkeit
// Geschwindigkeitswerte
const int POTIWERT_MAX = 1023;
const int DURATION_MAX = 510;
const int ANALOGWERT_MAX = 255;
int potiwert, duration, delaywert, fadewert;
int modulo_wert = 2;

void setup() {  
  Serial.begin(9600);
  for (int i=0; i<LED_MAX; i++) {
    pinMode(LED[i], OUTPUT);
  }
}

void loop() {
  potiwert = analogRead(POTI);
  duration = map(potiwert, 0, POTIWERT_MAX, 0, DURATION_MAX);
  fadewert = POTIWERT_MAX / duration;
  for (int i=0; i<LED_MAX; i++) {
    Serial.print("potiwert: "); Serial.print(potiwert);
    Serial.print(" | duration: "); Serial.print(duration);
    Serial.print(" | fadewert: "); Serial.print(fadewert);
    digitalWrite(LED[i], HIGH);
    if (i>=1) {
      Serial.print(" | faded j: ");
      for (int j=ANALOGWERT_MAX; j>=0; j--) {
        if ((j % fadewert) == 0) {
           Serial.print(j);
           Serial.print(" ");
          analogWrite(LED[i-1], j);
          delayMicroseconds(100);
        }
      }
      Serial.println("");
      if (duration >= ANALOGWERT_MAX) {
        delaywert = duration - ANALOGWERT_MAX;
      } else { delaywert = 0; }
    } else { 
      delaywert = DURATION_MAX; 
    }
    delay(delaywert);
    digitalWrite(LED[i], LOW);
  }

//  for (int i=7; i>=0; i--) {
//    Serial.println(i);
//    digitalWrite(LED[i], HIGH);
//    delay(500);
//    digitalWrite(LED[i], LOW);
//  }
}