#include "FastLED.h"

#define LED_NUM 7
#define LED_PIN 8
CRGB leds[LED_NUM];

void setup() {
  FastLED.addLeds < WS2812, LED_PIN, GRB > (leds, LED_NUM);
  FastLED.setBrightness(200);

  for (int i; i < LED_NUM; i ++) {
    leds[i].setHue(i * 255 / LED_NUM);
  }
  FastLED.show();
}

void loop() {

}