#include <FastLED.h>


#define NUM_LEDS 30
#define P_NUM 8

#define COLOR_ORDER GRB



CRGB leds[NUM_LEDS];


void setup() {

  FastLED.addLeds<WS2812B, P_NUM ,GRB>(leds, NUM_LEDS);

  Serial.begin(9600);
  FastLED.setBrightness(50);

  FastLED.clear();
  FastLED.show();
}

void loop() {
 for(int i=0;i<NUM_LEDS;i+=6)
 {
  for(int j=0;j<6;j++)
  {
    leds[i+j]=CRGB::Red;
  }
  delay(500);
  FastLED.show();
 }

}