#include <FastLED.h>

#define NUM_LEDS  6
#define LED_PIN   3

CRGB leds[NUM_LEDS];

void setup() {
  FastLED.addLeds<WS2812B, LED_PIN, GRB>(leds, NUM_LEDS);
  FastLED.setBrightness(255);
    
  leds[0] = CRGB::Red;
  FastLED.show();
  delay(500);
  
  leds[1] = CRGB::Green;
  FastLED.show();
  delay(500);

  leds[2] = CRGB::Blue;
  FastLED.show();
  delay(500);
  
  // schalte die nächste LED auf Gelb, Cyan bzw Magenta
  
  /* Entferne diesen Kommentarblock
  for (byte i=0; i<NUM_LEDS; i++) {
    leds[i] = CRGB::Black;
  }
  leds[-1] = CRGB::Green;
  leds[NUM_LEDS] = CRGB::Green;
  FastLED.show();
  delay(1500);
  */ 
}

void loop() {
  for (byte i=0; i<NUM_LEDS+1; i++) {
    leds[i-1] = CRGB::Black;
    leds[i] = CRGB::Red;
    FastLED.show();
    delay(150);
  }
/* Welche Auswirkung hat die if-Anweisung?
  for (byte i=0; i<NUM_LEDS; i++) {
    if (i==0) 
      leds[NUM_LEDS-1] = CRGB::Black;
    else
      leds[i-1] = CRGB::Black;
    leds[i] = CRGB::Red;
    FastLED.show();
    delay(115);
  }
*/
}