8

 // C++ code

//

int greenled=3;

int redled=10;

int yellowled=11;

int brightness=0;

int fade=5;

void setup()

{

  

}

void loop()

{

  analogWrite(greenled,brightness);

  analogWrite(redled,brightness);

  analogWrite(yellowled,brightness);

  brightness=brightness+fade;

  if((brightness==0)||(brightness==255)){

  }

  delay(50);

}