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carlover

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  1. Hi, I tried searching for information but I guess I don't know right terminology buzzwords ... This is general description of what I want to do: Have a vi acquire data through communication port. Data stream contains values from numerous variables (no problem with this..). I would like data to displayed using slider indicators . However, slider displays might change in future ( colors, shape, etc.) , or in future additional data sets might be coming through com port that needs to be displayed. What I would like to do is create a class called "slider" ( I am guessing class is right approach,
  2. QUOTE (vtince @ Apr 29 2009, 05:18 PM) In addition to some of the answers already provided, you could search LAVA and NI's site for example. Here are some threads/articles to get you started on motor/motion control: http://forums.lavag.org/Coding-Technique-a...ller-t9517.html http://zone.ni.com/devzone/cda/tut/p/id/30...on_fundamentals http://zone.ni.com/devzone/cda/tut/p/id/3054 As you probably know, what you are attempting to do/build has already been done before and perhaps you can incorporate those approaches into your project. I don't think that moving your solar tracking system f
  3. (mods if this is not right forum please move it) Hi all, I have NI-7356 motion card installed on Win XP box. After initial set up in MAX (encoders, quadrature, etc.) my robotics system runs fine in LabVIEW 8.5 PDS. After a while (weeks) I did notice that certain items in the MAX three start disappearing - for example if I want to see all options for Axis 1 some items are just blank, althoug "bullet space" for it is there - I'll post a screen shot tomorrow.... I am not sure when the items start disapearing but they are definently not there. NI support was stumpped - beside customary re-insta
  4. Hi, I have a PCI card, but don't have available PCI slots on my on my computer. There are couple of unused PCI-e and PCI-X slots available - Does anyone know of "an adapter" that would enable me to use PCI card in PCI-e or PCI-X slot. Waht I have avaible is: 1 PCI-e x8 slot wired as x4 2 PCI-X 64bit/100MHz slots with support for 3.3v or universal cards Only thing I found so far is PCI-e to PCI as seen here: http://www.beaglesoft.com/pcie2pci.htm (this might work but getting in timely manner might be an issue). Changing computers (to one with desired bumber of PCI slots) is might last
  5. Hi, I am trying to get an image from web page into IMAQ vision for processing - this is my ultimate goal. Basically image resides on webserver as (for example) http://example.com/myImage.jpg Image will be changing and I would like to read it at least 3-5 times a second. This is what I have so far, but perhaps there is better way: I can get the image using Datasocket method (see crelf's post). Instead of picture display I load it into IMAQ image (basically temp file that is saved is opened by IMAQ instead of Read JPEG). Speed is of the essence and I am wondering if there is a faster way
  6. I also have dual monitors and don't know how I would do it all on one screen ( spoiled). I also multiple computers which can complicate things .... Instead of bunch of KVMs I run Synergy app (free) which lets me seamlessly share wireless mouse and keyboard across computers -no clutter....
  7. QUOTE (Michael_Aivaliotis @ Nov 22 2008, 02:57 AM) I don't have a problem doing it, but: - it only "works" if you are logged into Google account while searching, otherwise you (user) will not be able to see it. I don't know about most people, but I am rarely logged into G account... - It's doubtful that Google will use this promotion/demotion in the search results page to influence general web page ranking as it could open it to very easy "gaming"....
  8. looong time ago (and many LV versions ago ) below coding test was given to me. Since then I've been in position to interview people and present my own challenges....At least from my experience you have to tailor questions to a position you are hiring for - senior / junior, developer or system engineer, etc. it seems that people who use LV are "jacks of bunch of trades" not just LV coders. Also particular industry experience is also handy - say that you are in telecom industry, it's beneficial if the candidate has experience working with specific instrumentation such as BERT testers, scopes,
  9. NI-IMAQ for USB is very disappointing - I really wish they would add functionality for multiple cameras. What *might* work for you is to utilize camera's API ( a la ActiveX) if you have access to it.
  10. QUOTE (Jim Kring @ May 26 2008, 02:06 AM) I thought I saw LV control panel (while they were receiving data few minutes before landing). It was a brief shot so I might be wrong....
  11. QUOTE (jpdrolet @ May 12 2008, 08:31 PM) we did similar thing on a multiple axis robotic platform (with stepper motors). since we used cheap usb game controller we had to define dead band, however we used velocity profile mode and mapped it to position of the 'stick', i.e. further you push it from the center faster it will go. Also, one of the spare buttons on the controller was used as a 'safety' - you had to press and hold it while controlling the robot (to avoid unintentional movement in case controller gets dropped, bumped, etc.). It's pretty fun...
  12. QUOTE I mean time synchronization - where I would have the ability to watch videos from all three cameras, and all cameras would show their prospective views at the same time frame of reference. One way is to time stamp frames using computers clock. I was wondering if there is a better/more elegant way to do so (remember cameras are usb and don't have common trigger) QUOTE (Neville D @ Mar 13 2008, 12:16 AM) Why don't you migrate to firewire cameras with a firewire card in your PC? That should solve your problem, and firewire cameras have better resolution, triggering and speed. Y
  13. Hi, I have three USB cameras and have to acquire, display, and save video. I do have an option to synchronize and process video 'offline' (it would be nice if it is in real time but not a requirement). It's on LV 8.5, Video Acq. 8.5.1, and I have image dev toolkit. My question is two part: - is there a way to simultaneously acquire from three USB cameras? - what's the best method to synchronize video from multiple usb cameras? I can acquire video from only one camera at a time. While I am aware of NI saying that IMAQ can only handle one USB camera at a time, is there a way around this?
  14. QUOTE(Karissap @ Oct 30 2007, 06:15 AM) Why use of shift registers for initial time "stamp" (are there any performance benefits, or...?). If you just connect initial seconds count to the while loop boundary every time loop iterates it will get same value; that would eliminate need to carry "non-changing" variable through the loop and shift registers. or am I missing something?
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