#include <FastLED.h> //The library needed for this code!
#define NUM_LEDS 18
#define LED_PIN 13

CRGB leds[NUM_LEDS]; //Circular RGB leds...

//Code settings...
void setup(){
  FastLED.addLeds <WS2812B, LED_PIN, GRB> (leds, NUM_LEDS);
  FastLED.setBrightness(1000);
  pinMode(LED_BUILTIN, OUTPUT);
}

//Code running...
void loop(){
  leds[0] = CRGB(255, 255, 0);
  leds[1] = CRGB(255, 0, 0);
  leds[2] = CRGB(255, 255, 0);
  leds[3] = CRGB(255, 0, 0);
  leds[4] = CRGB(255, 255, 0);
  leds[5] = CRGB(255, 0, 0);
  leds[6] = CRGB(255, 255, 0);
  leds[7] = CRGB(255, 0, 0);
  leds[8] = CRGB(255, 255, 0);
  leds[9] = CRGB(255, 0, 0);
  leds[10] = CRGB(255, 255, 0);
  leds[11] = CRGB(255, 0, 0);
  leds[12] = CRGB(255, 255, 0);
  leds[13] = CRGB(255, 0, 0);
  leds[14] = CRGB(255, 255, 0);
  leds[15] = CRGB(255, 0, 0);
  FastLED.show();
  delay(400);
  leds[0] = CRGB(0, 0, 255);
  leds[1] = CRGB(255, 255, 0);
  leds[2] = CRGB(0, 0, 255);
  leds[3] = CRGB(255, 255, 0);
  leds[4] = CRGB(0, 0, 255);
  leds[5] = CRGB(255, 255, 0);
  leds[6] = CRGB(0, 0, 255);
  leds[7] = CRGB(255, 255, 0);
  leds[8] = CRGB(0, 0, 255);
  leds[9] = CRGB(255, 255, 0);
  leds[10] = CRGB(0, 0, 255);
  leds[11] = CRGB(255, 255, 0);
  leds[12] = CRGB(0, 0, 255);
  leds[13] = CRGB(255, 255, 0);
  leds[14] = CRGB(0, 0, 255);
  leds[15] = CRGB(255, 255, 0);
  FastLED.show();
  delay(400);
}