question about return;

brice3010:
Good response! However, in my case there are only specific seconds where I want action. For example, at second 01, 21, 41.

 if ( second != lastSecond )
 {
  lastSecond = second;  // remember what second was last time we looked
  // second has changed... what is it now?

  if (second == 01)
  {
    //    do something once
  }
  if (second == 21)
  {
    //    do something once
  }
  if (second == 41)
  {
    //    do something once
  }
//....
 }

or better yet

 if ( second != lastSecond )
 {
  lastSecond = second;  // remember what second was last time we looked
  // second has changed... what is it now?

  switch (second)
  {
    case 1 :
    //    do something once
              break;
    case 21 :
    //    do something once
              break;
    case 41 :
    //    do something once
              break;
//....
    default :
               break;
  }
 }