//-------------------------------------------------------------------
#define PIN_RGB_ROT        9
#define PIN_LED_RGB_GRUEN  6
#define PIN_LED_RGB_BLAU  10

//-------------------------------------------------------------------
void setup() {
  // nix
}

//-------------------------------------------------------------------
void loop() {
  //---
  // RGB-LED in der Farbe ROT einblenden:
  for (int r = 0; r <= 255; r++) {

    // ROT: Tastgrad 0...255 = 0%...100%
    analogWrite(PIN_RGB_ROT, r);

    // Pause 10ms
    delay(10);
  }

  //---
  // RGB-LED in der Farbe ROT ausblenden:
  for (int r = 255; r >= 0; r--) {

    // ROT: Tastgrad 255...0 = 100%...0%
    analogWrite(PIN_RGB_ROT, r);

    // Pause 10ms
    delay(10);
  }

  //---
  // Pause 2000ms (2s)
  delay(2000);
}