const uint16_t N_PX = 300;
const uint8_t PXPIN = A0;

CRGB Pixels[N_PX];
Comet Cmt = Comet(CRGB Pixels, N_PX);

void setup() {
pinMode(PXPIN, OUTPUT);
FastLED.addLeds<WS2811, PXPIN, RGB>(Pixels, N_PX);
//first pixel magenta just to prove the connections are good and it's not my code...
Pixels[0]= CRGB::Magenta;
FastLED.show();

//setup the comet with these functions...
Comet.setHue(100);
Comet.setSpeed(200);
Comet.setFade(10);

}

void loop() {
Comet.Animate();
FastLED.show()
}