#include <FastLED.h>

#define LED_PIN     0
#define NUM_LEDS    20
#define BRIGHTNESS  100
#define LED_TYPE    WS2812
#define COLOR_ORDER GRB

CRGB leds[NUM_LEDS];

void setup() {
  Serial.begin(115200);
  while (!Serial);
  Serial.println("FastLED NeoPixel Test");

  FastLED.addLeds<LED_TYPE, LED_PIN, COLOR_ORDER>(leds, NUM_LEDS);
  FastLED.setBrightness(BRIGHTNESS);

  // Rainbow color test
  for (int i = 0; i < NUM_LEDS; i++) {
    leds[i] = CHSV(i * 10, 255, 255);
  }
  FastLED.show();
}

void loop() {
  // nothing
}