void setup() {
 // put your setup code here, to run once:
pinMode(6, OUTPUT);
}


void loop() {
   for(int i=0; i < 256; i++){
    for(int i=255){
 // Modulacion por ancho de pulso de led :
digitalWrite(6, LOW);
delay(1000);
digitalWrite(6, i);
delay(1000); //prendido al 100%
  }
    for(int i=191);{
digitalWrite(6, LOW);
delay(1000);
digitalWrite(6, i);
delay(1000); //prendido al 75%
digitalWrite(6, i);
delay(1000);
  }
   for(int i=128);{
digitalWrite(6, HIGH);
delay(1000); //prendido al 50%
digitalWrite(6, i);
delay(1000);
   }
    for(int i=64);{
digitalWrite(6, HIGH);
delay(1000); //prendido al 25%
digitalWrite(6, i);
delay(1000);
  }
   }
     analogWrite(5,i);
   delay(10);
 }