//fade LED up and down

int fadeValue;

void setup()
{
  Serial.begin(9600);
}

void loop()
{
 for(fadeValue=0;fadeValue<=255;fadeValue=fadeValue+5)    //fade up
 {
   analogWrite(3,fadeValue);
   delay(30);
   Serial.println(fadeValue); 
 }

 for(fadeValue=255;fadeValue>=0;fadeValue=fadeValue-5)    //fade down
 {
   analogWrite(3,fadeValue);
   delay(30);
   Serial.println(fadeValue);  
 } 
 
}