#include <FastLED.h>

#define LED_PIN  3

#define COLOR_ORDER GRB
#define CHIPSET     WS2811

#define BRIGHTNESS 254
#define FRAMES_PER_SECOND 30
#define NUM_LEDS    20

CRGB leds[NUM_LEDS];


void loop()
{
  fill_solid(leds, NUM_LEDS, CRGB:: Gold);
  for(int i = 0; i < NUM_LEDS; i++) { 
    Serial.println(NUM_LEDS - i);
    fill_solid(leds, i , CRGB:: Red);   // Counts 0 through 20 // fill_solid(position, # to fill, color);
    FastLED.show();
    FastLED.delay(150);
  }

}


void setup() {
  Serial.begin(115200);
  FastLED.addLeds<CHIPSET, LED_PIN, COLOR_ORDER>(leds, NUM_LEDS).setCorrection(TypicalSMD5050);
  FastLED.setBrightness( BRIGHTNESS );
  fill_solid(leds, NUM_LEDS, CRGB:: Black);
  FastLED.show();
}