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

//-------------------------------------------------------------------
void setTastgrad_RGBLED(int aROT, int aGRUEN, int aBLAU)
{
  analogWrite(PIN_RGB_ROT, aROT);
  analogWrite(PIN_LED_RGB_GRUEN, aGRUEN);
  analogWrite(PIN_LED_RGB_BLAU, aBLAU);
}

//-------------------------------------------------------------------
void setup() {
  // RGB-LED ausschalten:
  setTastgrad_RGBLED(0, 0, 0);
}

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

    // ROT+BLAU: Tastgrad 0...255 = 0%...100%
    setTastgrad_RGBLED(t, 0, t);

    // Pause 10ms
    delay(10);
  }

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

    // ROT+BLAU: Tastgrad 255...0 = 100%...0%
    setTastgrad_RGBLED(t, 0, t);

    // Pause 10ms
    delay(10);
  }

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