int led = 5;
void setup()
{
  pinMode(led, OUTPUT);
  Serial.begin(9600);
}

void loop()
{
  double light = analogRead(4);
  //int a = map(light,0,1023,0,255);
  int a = light / 4095 * 255;
  Serial.println(a);
  analogWrite(led, a);
  delay(100); // Delay a little bit to improve simulation performance
}