Display continuous USB data from a force transducer

[David McFarlane]

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
E-Prime training 
online:  http://psychology.msu.edu/Workshops_Courses/eprime.aspx
Twitter:  @EPrimeMaster (https://twitter.com/EPrimeMaster)

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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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