Presentation timer on a CV12 with an NI Series Master

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  ericmedley Posts: 4,177

  April 2016

  How I would approach this using pseudo-code and describing concepts:
  
  I would essentially (obviously) create a stop watch-type thing.
  
  I upon the start button - I would start a repeating timeline that ticks away each second. I would create a integer variable called MyTimer or whatever that starts at 1 and increments each fire of the timeline.
  
  The pause button would just pause/kill the timeline. The RESET button would just set the counter time back to zero.
  
  To display the time on the touch panel, I'd make a little routine/function that converts the integer decimal number of seconds since start to minutes/seconds.
  
  It looks like this:
  
  nMins=MyTijmer/60
  nSeconds= MyTimer-(MyTijmer*60)
  (there are quite a few ways to do this - this is basically just to explain the principle.
  
  Then convert the integers nMins and nSeconds to the text you want. and then send the whole text to a variable text button on the TP.
  
  You'll have to do a little bit of logic to deal with leading zeros and so forth.
  
  ex: if the nMins=5 and nSeconds=8
  
  if you just do something like send_string MyTP," 'TEXT101-',itoa(nMins),':',itoa(nSeconds)";
  you'll get 5:8 on the TP instead of 5:08 So, I'd do something like
  
  if(nSecond=0){MyString='00';}
  else if(nSecond<10){ MyString=" '0',itoa(nSeconds);
  else {MyString="itoa(nSeconds)";

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  javery1 Posts: 21

  April 2016

  Timelines could use better documentation in NetLinx Studio (like everything else), but they're not as tricky as they first appear.
  
  You will need to create a long variable to use as the timeline ID, and a long array to use as the times the timeline will fire. Something like this:

  DEFINE_CONSTANT
  long tlTimerID = 1;
  long tlTimerTimes[] = {1000};  //1000 = 1 second
  

  
  
  When it comes time to start the timer, timeline_create will start the timeline events firing at the specified times:

  timeline_create(tlTimerID, tlTimerTimes, max_length_array(tlTimerTimes), timeline_absolute, timeline_repeat);
  

  Here, it doesn't matter if we use timeline_absolute or timeline_relative, since we only have one time in our array, but if we had multiple items in the array, this would determine how they fired.
  Timeline_repeat will keep the timeline running until we stop it.
  
  
  When it comes time to stop the timer, use timeline_kill

  timeline_kill(tlTimerID);
  ​
  

  
  
  To perform a task when the time has elapsed, use a timeline event:

  timeline_event[tlTimerID]
  {
    //increment time here
    //display new time here
  }
  

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