====== Lauflicht ======

Die nachfolgenden Programme animieren ein aus mehreren Leuchdioden bestehendes Lauflicht.

Die Leuchtdioden werden an den Pins 2 bis 9 angeschlossen

==== Lauflicht in eine Richtung ====

<code c++>
const int DELAY_MS = 500;

const int PIN[] = { 2, 3, 4, 5 };
const int PIN_COUNT = 4;

int currentLed;

void setup() {
    int i = 0;
    while (i < PIN_COUNT) {
        pinMode(PIN[i], OUTPUT);
        i = i + 1;
    }

    currentLed = 0;
    digitalWrite(PIN[currentLed], HIGH);
}

void loop() {
    digitalWrite(PIN[currentLed], LOW);
    currentLed = currentLed + 1;
    if (PIN_COUNT <= currentLed) {
        currentLed = 0;
    }

    digitalWrite(PIN[currentLed], HIGH);
    delay(DELAY_MS);
}
</code>

==== Hin- und herbewegendes Lauflicht ====

Bei dieser Variante bewegt sich das Lauflicht hin und her.

<code c++>
const int DELAY_MS = 100;
const int PIN[] = { 2, 3, 4, 5, 6, 7, 8, 9 };
const int PIN_COUNT = 8;

int currentLed;
int dir;

void setup() {
    int i = 0;
    while (i < PIN_COUNT) {
        pinMode(PIN[i], OUTPUT);
        i = i + 1;
    }

    currentLed = 0;
    dir = 1;
    digitalWrite(PIN[currentLed], HIGH);
}

void loop() {
    digitalWrite(PIN[currentLed], LOW);
    currentLed = currentLed + dir;
    if (currentLed < 0 || PIN_COUNT <= currentLed) {
        dir = -dir;
        currentLed = currentLed + dir;
    }

    digitalWrite(PIN[currentLed], HIGH);
    delay(DELAY_MS);
}
</code>

==== Harmonische Schwingung ====

Bei dieser Variante stellt die Bewegung eine harmonische Schwingung dar.

<code c++>
const int DELAY_MS = 100;
const int PIN[] = { 2, 3, 4, 5, 6, 7, 8, 9 };
const int PIN_COUNT = 8;

int currentLed;
int dir;

void setup() {
    int i = 0;
    while (i < PIN_COUNT) {
        pinMode(PIN[i], OUTPUT);
        i = i + 1;
    }

    currentLed = 0;
    dir = 1;
}

void loop() {
    digitalWrite(PIN[currentLed], LOW);
    currentLed = currentLed + dir;
    if (currentLed < 0 || PIN_COUNT <= currentLed) {
        dir = -dir;
        currentLed = currentLed + dir;
    }

    digitalWrite(PIN[currentLed], HIGH);
    double maxAmp = PIN_COUNT / 2.0;
    double currAmp = currentLed - maxAmp;
    delay(DELAY_MS * abs(sin(currAmp / maxAmp)) + 100);
}
</code>