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psychopy and pyxid

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  • psychopy and pyxid

    Dear All,

    I am having some problems with my Lumina LSC-400 and Psychopy (1.84.1) on Windows 7.

    The Lumina box is working fine with Presentation, E-prime and PsychToolBox.

    It is connected to a Sunix serial interface card, with the serial port assigned to be COM1.

    If I follow the pyxid examples I cannot get Psychopy to recognise the Lumina (it moans about returning {} instead of a integer or string). Sorry I don't have the exact error. On the Lumina box I have tried selecting both Lumina and Cedrus RB mode (and a range of baud rates), nothing works.

    I have also tried calling get_xid_devices() multiple times, again no joy.

    Does anyone have any tips on how to troubleshoot this?

    Best wishes,


  • #2
    more info

    If I just add in the cedrus module into a standard builder view experiment in psychopy then run it, I get the following output:

    ERROR could not find a Cedrus device

    If instead I create a python script (using the CEDRUS suggested code) and put the following in:

    NOTE: I did use the proper indentation - it just doesn't seem to have come through in the quoted text.

    import pyxid

    # get a list of all attached XID devices
    devices = pyxid.get_xid_devices()
    devices = pyxid.get_xid_devices() # twice as per suggestion on Cedrus forum

    dev = devices[0] # get the first device to use
    if dev.is_response_device():

    while True:
    if dev.response_queue_size() > 0:
    response = dev.get_next_response()
    # do something with the response
    Then I get the following:

    ####### Running: C:\Users\fmri\Documents\PsychoPy\cedrusTest2\newte #######
    Traceback (most recent call last):
    File "C:\Users\fmri\Documents\PsychoPy\cedrusTest2\newt", line 6, in <module>
    devices = pyxid.get_xid_devices()
    File "build\bdist.win32\egg\pyxid\", line 19, in get_xid_devices
    File "build\bdist.win32\egg\pyxid\", line 17, in __init__
    File "build\bdist.win32\egg\pyxid\ ", line 27, in available_ports
    File "build\bdist.win32\egg\pyxid\ ", line 72, in available_ports
    File "C:\Program Files\PsychoPy2\lib\site-packages\serial\", line 31, in __init__
    super(Serial, self).__init__(*args, **kwargs)
    File "C:\Program Files\PsychoPy2\lib\site-packages\serial\", line 162, in __init__
    self.port = port
    File "C:\Program Files\PsychoPy2\lib\site-packages\serial\", line 206, in port
    raise ValueError('"port" must be None or a string, not {}'.format(type(port)))
    ValueError: "port" must be None or a string, not <type 'int'>
    Please can anyone help with this as I was hoping to use the Lumina with PsychoPy to run an experiment this week - and I'm completely stuck without it.

    Best wishes,



    • #3
      Jon, where did you get your pyxid? If it’s from pypi, that version is at least 5 years old. The latest version is always available on GitHub.

      As a general note: if our software is having trouble detecting an XID device, putting it in various different modes will not help.