void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(13, INPUT);
  pinMode(2, OUTPUT);
}

void loop() {
  int value=analogRead(13);
  int intensity = map(value,0,4095,0,255);
  analogWrite(2,intensity);
  Serial.println(intensity);
  delay(10); // this speeds up the simulation
}