#define  PIN_SENTIDO  2
const int ledChannel = 0;
const int ledPin = 14;
const int frequency = 5000;
const int resolution = 8;

void setup() {
  pinMode(ledPin, OUTPUT);
  pinMode(PIN_SENTIDO, OUTPUT);
 ledcAttachChannel(ledPin, frequency, resolution, ledChannel);
}

void loop(){
  // increase the LED brightness
  digitalWrite(PIN_SENTIDO, HIGH);
  for(int dutyCycle = 0; dutyCycle <= 255; dutyCycle++){   
    // changing the LED brightness with PWM
    ledcWrite(ledPin, dutyCycle);
    delay(15);
  }
 digitalWrite(PIN_SENTIDO, LOW);
  // decrease the LED brightness
  for(int dutyCycle = 255; dutyCycle >= 0; dutyCycle--){
    // changing the LED brightness with PWM
    ledcWrite(ledPin, dutyCycle);   
    delay(15);
  }
  delay(10);
}

//ledcSetup(ledChannel, frequency, resolution);