const int ledPin = 5;

void setup() {
  Serial.begin(115200);
  pinMode(ledPin, OUTPUT);   
  Serial.println("PWM Fade via analogWrite()");
}

void loop() {

  for (int duty = 0; duty <= 255; duty++) {
    analogWrite(ledPin, duty);        
    Serial.print("Naik : "); Serial.println(duty);
    delay(80);
  }

  for (int duty = 255; duty >= 0; duty--) {
    analogWrite(ledPin, duty);
    Serial.print("Turun: "); Serial.println(duty);
    delay(80);
  }
}