#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);
    Serial.println(i);
    delay(100);
  }
  for (int j=255; j>=1; j--){
    analogWrite(led_PWM,j);
    Serial.println(j);
    delay(100);
  }
  // put your main code here, to run repeatedly:
  delay(1000); // this speeds up the simulation
}