RGBSetDemo.ino

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#include <FastLED.h>
#define NUM_LEDS 40
 
CRGBArray<NUM_LEDS> leds;
 
void setup() { FastLED.addLeds<NEOPIXEL,2>(leds, NUM_LEDS); }
 
void loop(){ 
  static uint8_t hue;
  for(int i = 0; i < NUM_LEDS/2; i++) {   
    // fade everything out
    leds.fadeToBlackBy(40);
 
    // let's set an led value
    leds[i] = CHSV(hue++,255,255);
 
    // now, let's first 20 leds to the top 20 leds, 
    leds(NUM_LEDS/2,NUM_LEDS-1) = leds(NUM_LEDS/2 - 1 ,0);
    FastLED.delay(33);
  }
}