int LED = 5;
int lux;
int i;

void setup() {
  // put your setup code here, to run once:
  pinMode(5, OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
  lux = analogRead(A0);
  i = map(lux, 0, 1023, 0, 255);
  analogWrite(5, i);
  
}