#include <FastLED.h>

#define NUM_LEDS 10

#define DATA_PIN D1
#define CLOCK_PIN 13

CRGB leds[NUM_LEDS];

void setup() {
  Serial.begin(9600);
  delay(1500);

  FastLED.addLeds<WS2812, DATA_PIN>(leds, NUM_LEDS);
}

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

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