#include <FastLED.h>
#define NUM_LEDS 1
#define DATA_PIN 5

CRGB leds[NUM_LEDS];

void setup() {
    FastLED.addLeds<WS2813, DATA_PIN, RGB>(leds, NUM_LEDS);
}

void loop() {
  leds[0] = CRGB::Red;
  FastLED.show();
  delay(500);
  leds[0] = CRGB::Black;
  FastLED.show();
  delay(500);
}