randomized LED lighting using DAQ Card in eprime

[Paul Groot]

jp,

This would be easy if the device or driver supports memory mapped IO, just
like legacy parallel printer ports. Memory mapped IO can be programmed by
using the WritePort function or Onset/OffsetSignal* properties. The E-Basic
help documentation contains some printer-port based examples, which can be
used as a starting point if you know which address maps to the digital
output registers.

However, many modern (USB) based devices use other mechanisms to
communicate with applications, so it depends on the available drivers which
options you have. Unfortunately memory mapped IO is often not supported
anymore. Most manufacturers provide visual basic or C-code examples that
can be used as as starting point. In most cases you will have to use
external function calls (typically DLL functions) using inline E-Basic
script. This is less trivial than the memory mapped IO method.

best
Paul

2012/6/26 JP <jeremiahperkins3 at gmail.com>

> I am currently assisting in creating an experimental design for a
> professor. The task that i have right now is to wire two LEDs to a DAQ card
> and make them light up independently and randomly using Eprime inline code.
> We also need to make it so we can track the lighting so we know which light
> the participants may be responding to. I have found dozens
> of references regarding DAQ card coding but it all seems to be acquiring
> data through the card and not not using it to control a component.
>
> I was wondering if anyone had an idea about what the coding might look
> like or how to accomplish this.
>
>
> Thank you in advance for the help!!
>
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