#define BUZZER 11
#define POTENTIOMETER 5

void setup()
{
  pinMode(BUZZER, OUTPUT);
  pinMode(POTENTIOMETER, INPUT);
}

void loop()
{
int ValueFromPotentiometer = analogRead (POTENTIOMETER);
int ValueToBuzzer = map (ValueFromPotentiometer, 0, 1023, 0, 255);
analogWrite (BUZZER, ValueToBuzzer);
digitalWrite(LED_BUILTIN, HIGH);
}