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Posts posted by Mr CCE
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Hello everyone,
First I want to thank you for your help. I' ve been working on it and here's what happened so far:
- @ Hooovahh: About MAX yes I have it and I used it before I got the DAQ USB 6008 just to create a virtual DAQ and perform some tests and try out the different functions of DAQmx. And no, I was not using it when I ran my VI. As to the Express VI's with respect to DAQmx's, I'm starting not to like them either! I replaced the Express VI's with DAQmx functions such as "create task/ start/ clear / stop" ... etc Also I want to thank you for the other tips they were very useful. I tried some NI examples and not all of them are compatible with DAQ USB 6008 ( compatible with other DAQ modules).
- @ mesmith: It's exactly what I suspected the two express VI's are fighting over the DAQ resources. But as for your revised VI I couldn't open it, you see I'm using LabVIEW 7.1 and you're using version 10 so I got the message below.
Actually I was able to somehow bypass the problem and so far it's working. You know what I did? I created a flat sequence structure and placed each acquisition operation in a separate frame!
Anyways I've just started and the project is not yet complete so I'm gonna need your help everyone and thanks very much for the help so far.
Regards
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Hello everyone,
I'm a new Labview user and I'm currently working with DAQ USB 6008 to acquire a couple of analog inputs which are actually readings from variable resistors. I'm Using NI-DAQmx 7.5 with LabVIEW 7.1.
For this purpose I'm using a DAQ Assistant for each input and for each I' ve chosen Analog Input >> Voltage >> .. with single ended connection and acquisition of Single Sample ( On Demand ).
The problem is, everytime I run the VI an error occurs " The specified Resource is not available". Forgive me for this sort of question but you see, I'm a beginner and I really appreciate any help I can get from professionals like you guys.
I've attached my *.VI file plus two picture showing how I connected the two potentiometers/ variable resistors to the DAQ and the error that I received. Thanks very much in advance.
Best Regards
DAQ USB 6008 Multiple Analog Input
in Hardware
Posted
Hi everyone,
@ mesmith: Thanks very much for the great help I completed it yesterday and it's working perfectly.
- To be honest I tried doing it in a while loop before I resorted to the sequence structure but strange things happened and the readings from both POT's made very little sense so I thought I was doing it wrong.
so all new LV'ers do that? LOL so I guess I'm on the right track then!
- As U may have guessed it, I'm doing a project that includes position control where each of the variable resistors specify a position for a DC-Geared Motor and I' ve already added two additional POT's to act as feedback. The idea is that I want to apply PID theory but I'm not sure how exactly in LabVIEW. I heard there's a PID toolset but I don't know how to get it: Is it downloadable from "ni.com" ?
- Last but not least I need your advice everyone on how to achieve this 'cause I already did it with a PIC but not quite sure how with LabVIEW.
Best regards