int lumina;
int effet;

void setup() {
  // put your setup code here, to run once:
pinMode(11,OUTPUT);


}

void loop() {
  // put your main code here, to run repeatedly:
lumina = analogRead(0);
if (lumina>512){
  effet=map(lumina,512,1023,0,255);
  analogWrite(11,effet);
}
else{
analogWrite(11,0);
}


}