#include <SoftPWM.h>
int led = 13;           // the PWM pin the LED is attached to
int brightness = 0;    // how bright the LED is
int fadeAmount = 5;    // how many points to fade the LED by
void setup(){
  SoftPWMBegin();
  SoftPWMSet(led, 0);
}
void loop(){
  SoftPWMSet(led, brightness);
  brightness = brightness + fadeAmount;
  if (brightness <= 0 || brightness >= 255) {
    fadeAmount = -fadeAmount;
  }
  delay(30); 
}