| Data acquisition with IDL... [message #44840] |
Mon, 18 July 2005 05:36 |
Haje Korth
Messages: 651
Registered: May 1997
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Senior Member |
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Good morning everyone,
I had this urge on the weekend to convert a LabView data acquisition
software to IDL. Why? Because my brain has a hard time digesting the visual
coding done in LabView. With regards to the data acquisition everything when
fine. A short DLM was suffcient to read the voltages from the NIDAQ card.
The problem came with the visualization for which I wrote some widget code.
I put in a button for start/stop sampling and plotting the data, one datum
at the time. I always thought that the event loop runs through continuously
so that I can sample and plot at the beginning of the event handler before
the case statement checking for the event that occurred. However, when I
actually tested the code, I found out that the event handler only executes
when an event happened so that I have to hit the sample button for every
single measurement.
So, the questions I have are:
1. Can I make the event handler execute continuously somehow? And if not,
can I and how do I handle the events myself (without XMANAGER)?
2. Since spacing of data point is kind of important (regular intervals are
always preferred), can I rely on the timing in IDL? My goal is to take a
measurement across three channels every second.
I have never done data acquisition with IDL, so I have no idea how feasible
my ideas are. So your input is highly welcome.
Cheers,
Haje
PS: Please do not suggest the LabView bridge to IDL. The fact is that I do
not like LabView!!! Besides I am sure the cost of the bridge soft is beyond
what I can justify to spend on this task.
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