void setup() {
  pinMode(5,OUTPUT);
  // put your setup code here, to run once:
  Serial.begin(9600);
  Serial.println("Hello, ESP32!");
}

void loop() {
  for(int dc=0; dc<=255;dc++)
  {
    analogWrite(5,dc);
  }
  delay(100);
for(int dc=255;dc>=0;dc--){
  analogWrite(5,dc);
}

delay(100);

}