#include <FastLED.h>

#define NUM_LEDS  240

CRGB led1[NUM_LEDS];

void setup() {
  FastLED.addLeds<WS2812B, 9, GRB>(led1, NUM_LEDS);
  FastLED.setBrightness(100);
}

void loop() {
  for (int a = 0; a <= NUM_LEDS ; a++) {
    led1[a] = CRGB(255, 0, 0);
    FastLED.show();
    delay(30);
  }
  for (int a = NUM_LEDS; a >= 0; a--) {
    led1[a] = CRGB::Black;
    FastLED.show();
    delay(30);
  }
}