#include <FastLED.h>

#define NUM_LEDS 16 // number of LEDs in the strip
#define NUM_LEDS2 16 // number of LEDs in the strip
#define DATA_PIN 6 // pin to connect the data line of the strip
#define DATA_PIN2 7 // pin to connect the data line of the strip
#define BRIGHTNESS 255 // maximum brightness of the LEDs

CRGB leds[NUM_LEDS+NUM_LEDS2]; // array to store the LED colors
//CRGB leds2[NUM_LEDS2]; // array to store the LED colors
unsigned int iteration = 0;
unsigned long lastIteration = 0;
unsigned int cycle = 0;
unsigned int manipulateLEDs;
void setup() {
  FastLED.addLeds<WS2812B, DATA_PIN, GRB>(leds, NUM_LEDS); // initialize the LED strip
  FastLED.addLeds<WS2812B, DATA_PIN2, GRB>(leds, NUM_LEDS, NUM_LEDS2); // initialize the LED strip
  FastLED.setBrightness(BRIGHTNESS); // set the brightness
  manipulateLEDs = NUM_LEDS + NUM_LEDS2;
}

void loop() {
  if (millis() - lastIteration >= 10) {
    //changeLED(iteration++, 255, 0, 0);
    leds[iteration++].setRGB(255, 0, 0);
    if (iteration > 1) leds[iteration - 2].setRGB(0, 0, 0);  //changeLED(iteration - 2, 0, 0, 0);
    if (iteration >= manipulateLEDs - cycle) {
      iteration = 0;
      cycle++;
      if (cycle == manipulateLEDs) {
        cycle = 0;
        manipulateLEDs = NUM_LEDS + 1;
        for (int i = 0; i < NUM_LEDS; i++)
          leds[iteration++].setRGB(0, 0, 0);
        //FastLED.clear();
        FastLED.show();
      }
    }
    FastLED.show();
    lastIteration = millis();
  }
}

/*void changeLED(int number, int red, int green, int blue) {
  if (number < NUM_LEDS) {
    leds[number].setRGB(red, green, blue);
  } else {
    leds2[number - NUM_LEDS].setRGB(red, green, blue);
  }
}
union AllLEDs
{
    struct {
        CRGB one[NUM_LEDS];
        CRGB two[NUM_LEDS2];
    }ledstrip;
    CRGB virtualLeds[NUM_LEDS+NUM_LEDS2];
} allLEDs; */