Automatic light intensity control using LDR and Arduino - Wokwi ESP32, STM32, Arduino Simulator

int LED=9; 
int sensor=A0; 

void setup()
{
  pinMode(LED,OUTPUT);
}

void loop()
{
  int val = analogRead(sensor); 
  int out=map(val,0,1023,1023,0);  
  analogWrite(LED,out/4);  
}