const int pinLed = 21;

const int channel = 1; //0 - 15 Kanäle
const int frequency = 1000; //1000 Hz oder 1000 Perioden pro Sekunde
const int resolution = 7; //8 Bit -> Wertebereich 0 - 255 / von 1-16 Bit



void setup() {

  pinMode(pinLed, OUTPUT);

  ledcSetup(channel, frequency, resolution);
  ledcAttachPin(pinLed, channel);

  Serial.begin(115200);


}

void loop() {


for(int i = 0; i<255; i++){

  ledcWrite(channel, i);  
  delay(50);
}

  Serial.println("LED Wird Dunkel");


for(int j = 255; j>0; j--){

  ledcWrite(channel, j);  
  delay(50);
}

  Serial.println("LED Wird Hell");



}