// LED is connected to GPIO 2
const int ledPin = 2;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(ledPin, OUTPUT);
  Serial.println("Hello, Ade Satria Hardinata!");
}

void loop() {
  // increase the LED brightness
  for(int dutyCycle = 0; dutyCycle < 255; dutyCycle++) {   
    // changing the LED brightness with PWM
    analogWrite(ledPin, dutyCycle);
    delay(3);
  }

  // decrease the LED brightness
  for(int dutyCycle = 255; dutyCycle > 0; dutyCycle--) {
    // changing the LED brightness with PWM
    analogWrite(ledPin, dutyCycle);
    delay(3);
  }
}