#include <FastLED.h>

#define NUM_LEDS_PER_STRIP 20
#define NUM_STRIPS 1
#define NUM_LEDS   NUM_LEDS_PER_STRIP
CRGBArray <NUM_LEDS_PER_STRIP * NUM_STRIPS> leds;

CRGBSet PANEL_LED[] = {
  leds(3, 0),
  leds(3, 1),
  leds(3, 2),
  leds(3, 3),
  leds(3, 4),
  leds(3, 5),

  leds(0, 3),
  leds(4, 7),
  leds(8, 11),
  leds(12, 15),
  leds(16, 19),
};


void setup() {
    FastLED.addLeds<NEOPIXEL, 5>(leds, NUM_LEDS).setCorrection( TypicalLEDStrip );
    FastLED.clear();
}


void loop() {
    for (int set = 0; set < sizeof(PANEL_LED) / sizeof(PANEL_LED[0]); set++) {
        PANEL_LED[set] = CRGB::Red;
        FastLED.delay(500);
        PANEL_LED[set] = CRGB::Black;
        FastLED.delay(500);
    }
}