#define ADCpin 34
#define LEDpin 15

float ADCval;
int val = 0;
int resolution = 15;

void setup(){
  Serial.begin(115200);
  pinMode(LEDpin, INPUT);
  ledcAttach(LEDpin, 50, resolution);

}

void loop(){
  ADCval = map(analogRead(ADCpin), 0.0, 4095.0, 0.5, 50);
  ledcWriteTone(LEDpin, ADCval);
  
  Serial.print("Potentiometer value: ");
  Serial.print(analogRead(ADCpin));
  Serial.print("    |Frequency:  ");
  Serial.print(ADCval);
  Serial.println("  Hz");
  delay(1000);

}