int led(11);
int brightness = 0;
int fadeAmount = 7;
void setup() {
  // put your setup code here, to run once:
pinMode(11, OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
 analogWrite(11, brightness);
 

 brightness = brightness + fadeAmount;

   if (brightness <= 0 || brightness >= 255) {
    fadeAmount = -fadeAmount;
   }
     delay(30);
}