Triggering TMS machine with labjack

[rwa...@gmail.com]

I'm trying to use labjack to trigger stimulation from our TMS machine. I'm failing at almost the first hurdle. 

I'm running OS X 10.8.5 and PsychoPy 1.81.03 (and also 1.82.01). 

I've installed the LabJackPython drivers and libusb packages. 

Within a python session from the terminal (Python 2.7.2), I can

import u3

d=u3.U3()

and then do some of the reading and configuring,

Within psychopy coder view, I have been trying what's recommended in the help docs:

from labjack import u3

But I get the error: 

ImportError: cannot import name u3

If I just try to import u3 directly, I'm unable to, presumably PsychoPy is looking elsewhere for the module?

A search of labjack within the group turned up a similar unanswered question. If anyone has suggestions, that would be much appreciated!

[rwa...@gmail.com]

One correction and one additional point

Correction what fails in the coder view is 

from labjacks import u3

Also tried to use a parallel out port in Builder view and get a similar error. The offending lines:

from psychopy.hardware import labjacks

p_port = labjacks.U3()

    import u3

ImportError: No module named u3

[Jared Roberts]

Hello,

Are you using the standalone install of psychopy?  If so, it keeps its own registry of python libraries separate from the system's python install.  I don't know about labjack in particular, but I've had success before in copying python libraries from the system's site-packages folder into the standalone app's Contents/Resources/lib folder.  That's kind of a hack though, and may not work with all packages.  Probably the correct way to deal with something like this is to install psychopy and its dependencies to your system python interpreter.  You can find more info here: http://www.psychopy.org/installation.html

-Jared

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[Jeremy Gray]

You can also add libraries to a list in preferences > general > paths

--Jeremy

To view this discussion on the web visit https://groups.google.com/d/msgid/psychopy-users/CA%2B0fxeVj%2Bj9jNEAs_NY0Ht4Lp5TE_6r6yyDH12x_aZ8FE8hp6w%40mail.gmail.com.

[r.w...@bangor.ac.uk]

Thanks Jared and Jeremy for the replies

I don't know much about the nitty-gritty of library installation. Is there an easy way to find out from where a module has been imported? I mean, if I say:

import u3

Is there a way for me to find out where on my computer python pulled the u3 module?

[Axel Kohler]

If the import was successfull, you can get a hint with:

u3.__file__

If you are even unsure about which Python you are using at the moment, you can also do the following from within Python:

import sys
sys.executable

Cheers,

Axel

[Jonathan Peirce]

If you use the standalone distribution of psychopy then you need to do either:
    from labjack import u3
    dev = u3.U3()
If you have your own python installation then you need to do:
    import u3
    dev = u3.U3()

The reason is that labjack's install method dumps its files not in a folder but individually into python site-packages folder. I can't distribute it that way for technical reasons (py2app) and because it offends me ;-)

BUT if you do the following then psychopy should check for either type of install and work correctly:
    from psychopy.hardware import labjacks
    device = labjacks.U3()
This also adds an extra method called setData() to the device that labjcak didn't provide and I prefer.

So if that isn't working then we need to know more about how you created your python installation.

cheers
Jon

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Jonathan Peirce
Nottingham Visual Neuroscience

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[r.w...@bangor.ac.uk]

Someone took the labjack last night, so a sliiiiiight delay while I track it down.

[r.w...@bangor.ac.uk]

OK Jonathan, to follow up your suggestions.

From the terminal I am running python 2.7.2 (from /usr/bin/python)

From there I can reach the labjack, e.g.

import u3; d=u3.U3(); d.getFIOState(4)

In the coder view 1.81.03 (sys.executable = /Applications/PsychoPy2.app/Contents/MacOS/python):

if I try 

import u3

I get ImportError: No module named u3

If I try either

from psychopy.hardware import labjacks

or

from labjack import u3

Then I get another error related to a driver, appended below. I had to compile the libusb myself. I don't know how it works for one python and not the other?

Rob

Traceback (most recent call last):

  File "/Volumes/OLD/Users/pss143/Dropbox/Rob/Active/faces/tms/untitled.py", line 4, in <module>

    from labjack import u3

  File "/Applications/PsychoPy2.app/Contents/Resources/lib/python2.7/labjack/__init__.py", line 1, in <module>

    import u3, u6, u12, ue9, skymote, Modbus

  File "/Applications/PsychoPy2.app/Contents/Resources/lib/python2.7/labjack/u12.py", line 378, in <module>

    raise U12Exception("Could not load the Exodriver driver. Ethernet connectivity only.\n\nCheck that the Exodriver is installed, and the permissions are set correctly.\nThe error message was: %s" % e)

labjack.u12.U12Exception: Could not load the Exodriver driver. Ethernet connectivity only.

Check that the Exodriver is installed, and the permissions are set correctly.

The error message was: dlopen(liblabjackusb.dylib, 6): Library not loaded: /usr/local/lib/libusb-1.0.0.dylib

  Referenced from: /usr/local/lib/liblabjackusb.dylib

  Reason: no suitable image found.  Did find:

/usr/local/lib/libusb-1.0.0.dylib: mach-o, but wrong architecture

/usr/local/lib/libusb-1.0.0.dylib: mach-o, but wrong architecture

On Thursday, March 5, 2015 at 3:45:55 PM UTC, Jon wrote:

[r.w...@bangor.ac.uk]

Thanks everyone for your help. THe issue I was having with "mach-o wrong architecture" is addressed at the labjack site. There are step-by-step instructions for installing dual-architecture libusb and liblabjackusb libraries. So I can now set and get FIO states in psychopy (as well as the python command line).

One reason I'm working on this in psychopy is to try to make it easier for people to use the TMS stimulator. If there are any suggestions on how to easily install the correct libraries I'd be interested to hear. Currently the first step of the procedure will be (1) install XCODE!

[Jonathan Peirce]

On 09/03/2015 09:46, r.w...@bangor.ac.uk wrote:
> Then I get another error related to a driver, appended below. I had to
> compile the libusb myself. I don't know how it works for one python
> and not the other?

If the driver was 64bit then it would have worked from Mac's built-in
(64bit) python but not from the 32bit python that we use for PsychoPy.

Jon