LabView dashboard/live telemetry

[Russ Beavis]

I should have added the suggestion from Chaos in a Can to my earlier post. That's a VALUABLE lesson in LabVIEW development (and, I'd imagine, any multi-threading application that needs to share time in an OS).

You should always make sure that loops only execute at a reasonable rate. Without adding an intentional delay within a while loop or using a timed loop (which does this for you), the loop will execute at max speed and cause the OS and CPU to max out.

As an example, create a simple while loop with only an increment and display and then run it. You'll find that it will execute at a few MHz and cause your PC to slow down tremendously. Add a 1ms wait in the loop to force it to execute at 1kHz and everything will be fine.

Russ

[stevethetinker]

I had the dashboard demo (the one in LV in projectwizards) working a couple of weeks ago, and now when I try to build it it says the vi is broken. Has anyone encountered this problem? Is there a fix short of reinstallling LV?

[Russ Beavis]

Have you installed the latest LVUpdate and reimaged both the cRIO and DS?

http://joule.ni.com/nidu/cds/view/p/lang/en/id/1180

If you have done the installation recently, my understanding is that you'll need to open a new FRC project and "import" your custom VIs. Without going through the "new project" process, you may have some bad links to sub-VIs.

Another option is to press the broken run arrow and let LabVIEW point out where the problem is. It shouldn't be too hard to track down the issue.

Russ

[stevethetinker]

I have the latest and have reimaged. I did as you suggested about finding the problem and came to a 'well duh' moment. I was trying to build the template. I had forgotten to go to the labview main dialog and create a dashboard project. When I did that it worked.