LAVA Gives away NI $150 USB DAQ

The LAVA website is giving away a NI USB DAQ worth $150 in the latest coding challenge.
http://forums.lavag.org/index.php?showtopic=3423
Michael Aivaliotis
VI Shots LLC

Hi Lynn, thanks for the response. I'll try to answer all of your questions.
I'll scope the outputs with an oscilloscope but the rated rise time on the encoder is quick enough that it shouldn't be an issue. I also run the program on just one analog input with no problems. I figure if there was noise in the encoder signal it would show up no matter how many analog inputs I'm sampling.
When I run two inputs I have error -200019 coming out of the DAQmx Read VI. This error doesn't show up on just one analog input, only when I run two and only when the behavior that I describe in the next paragraph shows up.
The zeros are in my written data but you can clearly see them in the measurement window. The attached picture is what my front panel looks like after a successful run. When it doesn't sample correctly the primary graph (cylinder pressure) drops to zero after between 50-150 samples. I open the spreadsheet and I see that it's recorded primarily zeroes.
I've tried this on both Windows 7 and XP to the same results. I am aware of the XP USB connectivity issues and I installed the necessary Microsoft patch. The card is connected directly to a USB port, I believe it's 2.0. If by load you mean how much avalaible memory and CPU power is available, it doesn't look I'm even close to maxing out the PC. I tried closing excess programs as well as disabling all the other functions of the Labview program (analyzing and writing to file) to see if I was asking it to do too much at a time.
Attachments:
v34 Screenshot.JPG ‏432 KB

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