anemometer and PCI9112

[nicolas_french_student]

Hi everybody,

I am a French student, so please escuse my poor English...

As I am a total beginner in Labview, I would like to have your
opinion, or some advice, about the difficulties of this project :

First I want to build a VI to acquire values from the 4 sensors : wind
speed & direction, intensity & voltage of a wind turbine (to obtain
its power).
Then secondly I think I will use a php script to analyse the data from
the file in whitch I put the values of my sensors, in order to create
graphics and to put them on a website. In fact maybe Labview will be
simplier than php for this second step. What do you think about that
particular point?


I have two questions to make:

1. I didn't find any thing about this subject in the web or in this
foru
m and I would like to know if someone has already worked on this
subject. Maybe he could give me some advice about the sample frequency
I should take for example. Aslo I would like very much to see an
exemple of a VI contrallable through internet, but I can't find any
adress, except this one which is really interesting but withour any
comments on the VI the use.
http://www.eicn.ch/cces/graphes/

2. My acquisition card is a PCI9112 from Adlink and I have some
special drivers to make this card work with Labview. I would really
like to know if there is a possibility to use the "Data Acquisition"
tools instead of the one that Adlink gives with the card : PCIS-LVIEW.
I find thoose ones really poor and hard to use in compatraison of the
others. When I use the Data Acquisition tools, Labview tells me that
my card is not recognised or compatible. But happily that works fine
with the Adlink tools, even if it is quite hard to use.

I checked for NI drivers for my card but they don't seem to know

Adlink!


I am sorry if my questions seem to be stupid, I am a complete
beginner!

Thanks for very much for any help or comments,

Nicolas

[mikeporter]

In terms of your second point, I would say go for the LV-based solution. Using the web-server functionality you can have your data online with little or no extra work. Find-out about the web-server and that will answer many of your questions--such as in your question 1. You can make a VI "read-only" or allow people to actually interact with it over the web.

In terms of question 2, if you use something other than an NI card you are pretty much stuck with whatever they provide for drivers. If you think about it that is really what you are getting special with NI hardware. The truth of the matter is that many vendors offer hardware that is pretty similar--what NI gives you is NI-DAQ. IMHO, that driver software is worth the price of admission all by itself.


Mike...

PS: just as a matter of curiosity, how much did you pay for the Adlink card?

[David Huggins]

1. It would be much easier to use LabView to create a web-accessible application. I've not done this, but I understand that it is quite simple to make your control panel appear and function as a web application. I'm quite sure you can find examples of this task on the NI developer support site.

2. Got an Adlink card you'll need to use the Adlink VI's. They appear to be well documented, but that says nothing about how well they are implemented.

As far as sampling rates and so forth, look at the LabView examples that came from NI - I remember an example application called "anemometer"!

Good luck - I'd actually like to develop a little stand-alone weather station like this to put at the sailing club so I'd know if I should leave work early and go sail
ing!

Cheers,

[nicolas_french_student]

> PS: just as a matter of curiosity, how much did you pay for the Adlink
> card?

In fact I find it on a PC in the university lab, but I know it is a
really expensive card.

thanks for your advise, I test the Labview server and it works really
well. I still hesistate with php because once we have the data, we can
just imagine what we really want with it, without the need of having
Labview.

do you know where I can find some examples of VI which acquire a
waveform in a PC with this PCI9112 card?

thanks

Nicolas

[mikeporter]

sorry, no

Mike...

[nicolas_french_student]

Thanks for your answer.

About the anemometer applicationm I didn t find it. Is it in the LabVIEW Directory\examples\ ? I didn t find anything either on the net...

As I have a lot of trouble with my vi, I put it in attached file of the mail. If somone has some time, it will really help me a lot!

the purpose of my vi is to show and to acquire a waveform. the problem is that:

1. when it acquires, it stops showing, and I don t know how to do to avoid this problem

2. when it acquires, it is strange: I don t understand what happen exactly:
I would like to have:
3/06/03_19:15:37__3.21
3/06/03_19:15:37__2.223
3/06/03_19:15:37__3.212
3/06/03_19:15:37__3.213

instead of that I have some values which are not between -5 a
nd 5V, and which are not all near a time stamp!

I am a bit lost!!!

Thank you very much for any contribution

Nicolas

[David Huggins]

sorry - the example starts on page 4-3 of the LabView Measurements Manual.

I can't really examine your VI since I don't have the 9112 VI's, but it looks like you're taking a vector of readings from the A/D board and writing them 37 at a time to the file?

The values are betwenn -5v and +5v if they are in millivolts.