#define LED 4

void setup() {
  Serial.begin(115200);
  pinMode(LED , OUTPUT);
}

void loop() {
  int potentiometerValue = analogRead(34);
  int Brightness = map(potentiometerValue, 0, 1023, 0, 255); 
 
 
  Serial.print("Potentiometer value: ");
  Serial.print(potentiometerValue);
  Serial.print("   ,     LED brightness: ");
  Serial.println(Brightness);

  digitalWrite(4, Brightness);

  delay(10);
}