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Fade an led in and out

 const int led=13;

int i;

void setup()

{

  pinMode(led,OUTPUT);


}

void loop()

{

 for(i=0;i<255;i++)

 {

  analogWrite(led,i);

   delay(10);

 }

  for(i=255;i>0;i--)

  {

    analogWrite(led,i);

   delay(10); 

  }

}


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