Display continuous USB data from a force transducer

[Bree]

Hi David,
Thanks for your input, I wish I would have asked you this questions before
purchasing E-Prime as I explained my task specifically to them and they
assured me that it would be possible.  I wish I hadn't wasted my limited
budget.  Thanks for the help.
Bree

On Tue, Jan 22, 2013 at 10:07 AM, David McFarlane <mcfarla9 at msu.edu> wrote:

> Bree,
>
> First of all, this looks like a fine example of a task particularly
> ill-suited to E-Prime.  You might well find a better platform for this
> task.  And since you say you use a National Instruments box, you might
> start by looking at their LabVIEW software.
>
> But if you must proceed with EP, then I would ask, doesn't the National
> Instrumtents box come with a library of functions in a .dll file?  If so,
> then you merely have to make those functions available to EP through the
> appropriate Declare statements, and that should all be documented by
> National Instruments.  As you should have figured out by now, EP does not
> provide any native support for USB communication (and if we understood more
> about USB, then we might understand why not).
>
> -----
> David McFarlane
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> At 1/19/2013 05:24 PM Saturday, bree wrote:
>
>> I'm currently trying to input data from two force transducers into
>> E-prime so that it will display on the screen in real time.  The task is a
>> pursuit tracking task where a subject is using a finger force to trace a
>> line that goes up and down as it progresses across the screen.  I'd like to
>> be able to display the force as a cursor or a line across the screen in
>> real time.  The force transducers are input through a National Instruments
>> box into the USB port on my laptop.  I've tried adding a port, and I've
>> tried adding a joystick to the devices, but I can't figure out how to tell
>> E-Prime what to do with the USB input.  There should be 12 inputs, the xyz
>> magnitudes of each force, and the xyz torques of each force.  I'd only need
>> to plot one of them, the z magnitude, but I'm not sure how to tell E-prime
>> that.  Which device should I use, and if I need to do some visual basic
>> coding which functions should I start with?
>>
>> I hope that makes sense.
>> Thanks,
>> Bree
>>
>
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-- 
Breanna Studenka, Ph.D.
HPER Building 144
Utah State University
7000 Old Main Hill
Logan, UT 84322

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