#include <FastLED.h>

#define LED_PIN     4
#define NUM_LEDS    16*6
#define BRIGHTNESS  255
#define LED_TYPE    WS2811
#define COLOR_ORDER GRB
CRGB leds[NUM_LEDS];
uint8_t rings=6;

void setup() {
    FastLED.addLeds<LED_TYPE, LED_PIN, COLOR_ORDER>(leds, NUM_LEDS).setCorrection( TypicalLEDStrip );
    FastLED.setBrightness( BRIGHTNESS );
    fill_solid(leds, NUM_LEDS, CRGB::Black);
    FastLED.show();

}

void loop() {
 for (int i=0;i<rings;i++)
  {
    fill_solid(leds, NUM_LEDS, CRGB(255,255,255));
    fill_solid(&leds[i*16], 16, CRGB::Black);
    FastLED.show();
    
    delay(150);
  }

}