// the number of the LED pin
const int ledPin = 16 ;  // 16 corresponds to GPIO 16

// setting PWM properties
const int freq = 5000;
const int resolution = 4;

// Potentiometer is connected to GPIO 34 (Analog ADC1_CH6) 
const int potPin = 34;

// variable for storing the potentiometer value
int potValue = 0;


void setup(){
  Serial.begin(115200);
  // configure LED PWM
  ledcAttach(ledPin, freq, resolution);
  
  // if you want to attach a specific channel, use the following instead
  //ledcAttachChannel(ledPin, freq, resolution, 0);
}
 
void loop(){

  // Reading potentiometer value
  potValue = analogRead(potPin);
  Serial.println(potValue);

  // increase the LED brightness
  for(int dutyCycle = 0; dutyCycle <= 255; dutyCycle++){   
    // changing the LED brightness with PWM
    ledcWrite(ledPin, dutyCycle);
    delay(15);
  }

  // decrease the LED brightness
  for(int dutyCycle = 255; dutyCycle >= 0; dutyCycle--){
    // changing the LED brightness with PWM
    ledcWrite(ledPin, dutyCycle);   
    delay(15);
  }
}