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-   -   psychopy and pyxid (http://community.cedrus.com/showthread.php?t=2210)

angrypanda November 21st, 2016 02:19 AM

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 serial_blah.py 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,


angrypanda November 23rd, 2016 05:09 AM

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 st.py #######
Traceback (most recent call last):
File "C:\Users\fmri\Documents\PsychoPy\cedrusTest2\newt est.py", line 6, in <module>
devices = pyxid.get_xid_devices()
File "build\bdist.win32\egg\pyxid\__init__.py", line 19, in get_xid_devices
File "build\bdist.win32\egg\pyxid\pyxid_impl.py", line 17, in __init__
File "build\bdist.win32\egg\pyxid\serial_wrapper.py ", line 27, in available_ports
File "build\bdist.win32\egg\pyxid\serial_wrapper.py ", line 72, in available_ports
File "C:\Program Files\PsychoPy2\lib\site-packages\serial\serialwin32.py", line 31, in __init__
super(Serial, self).__init__(*args, **kwargs)
File "C:\Program Files\PsychoPy2\lib\site-packages\serial\serialutil.py", line 162, in __init__
self.port = port
File "C:\Program Files\PsychoPy2\lib\site-packages\serial\serialutil.py", 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,


Hisham January 10th, 2017 10:58 AM

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.

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