#include <FastLED.h>

#define LED_PIN 7
#define NUM_LEDS 1

CRGB leds[NUM_LEDS];

void setup() {
  // put your setup code here, to run once:
  FastLED.addLeds<WS2812, LED_PIN, GRB>(leds, NUM_LEDS);
}

void loop() {
  // put your main code here, to run repeatedly:
leds[0] = CRGB(255, 0, 0);
  FastLED.show();
  delay(100);  
leds[0] = CRGB(0, 0, 0);
  FastLED.show();
  delay(2000);    
}