// Source: https://github.com/FastLED/FastLED/blob/master/examples/ColorPalette/ColorPalette.ino

#include <FastLED.h>

#define LED_PIN     3
#define NUM_LEDS    256
#define LED_TYPE    WS2812
CRGB leds[NUM_LEDS];

void setup() {
  FastLED.addLeds<LED_TYPE, LED_PIN, GRB>(leds, NUM_LEDS);
}


void loop() {
  static uint16_t i = 0;
  leds[i] = 0xffffff;
  FastLED.show();
  leds[i] = 0;
  i = ++i % NUM_LEDS;
  delay(100);
}