#define led_PWM 16

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(led_PWM, OUTPUT);
}

void loop() {
  for (int i=1; i <= 255; i++){
    analogWrite(led_PWM,i);
    delay(100);
    Serial.println(i);
  }
  
  for (int j=255; j >= 0; j--){
  analogWrite(led_PWM,j);
  delay(100);
  Serial.println(j);
  }
  delay(5000);
}