#define buzzer D8
#define potX   D2

int notes[] = {262, 294, 330, 349, 392, 440, 494, 523};
int numNotes = 8;

void setup() {
  ledcAttach(buzzer, 2000, 10); // canal PWM para sonido
}

void loop() {
  int value = analogRead(potX);

  int index = map(value, 0, 4095, 0, numNotes - 1);

  int freq = notes[index];

  ledcWriteTone(buzzer, freq);

  delay(50);
}