Rainbow Knight Rider for WS2812 LEDs

gistfile1.ino

void knightRider(uint8_t wait) {
    uint8_t i, j, x = 1, prev = 11;
    
    for (j = 0; j < 256; j++) {
        for (i = 0; i >= -1; i = i + x) {
        
            if (i == 255)
                return;
            if (i > PIXEL_COUNT)
                x = -1;
    
            strip.setPixelColor(i, Wheel(j));
            strip.setPixelColor(prev, 0);
            strip.show();    
            delay(wait);
            prev = i;
            j += 6;
        }    
    }
}