Eye tracking with TobiiPro Nano: trackerserialnumber error

SophieScharf

Hey everyone,

I want to use opensesame and pygaze to run eye-tracking experiments with a TobiiPro Nano eye tracker. I ran into a problem that already has been mentioned in this Thread: Unless I add the inline-script mentioned by Edwin setting the Serial Number of the eye tracker, I get the error that the trackerserialnumber can't be found. (I work with Python 3.8.13 and Opensesame 3.3.13)

I was wondering if anyone has found a solution for this issue that does not include adding inline scrips with individual serial numbers? While this solution works for testing purposes, it is not really practical for a lab with 10 eye trackers (i.e. 10 individual serial numbers).

Any tips and hints are highly appreciated!

All the best

Sophie

eduard

Hi Sophie,

it sounds more like being an issue on the Tobii end. Their SDK should be able to retrieve and use the serial numbers of the tracker. Anyway, I don't think there is a real solution for it available in Opensesame or Pygaze at the moment.

For your specific situation, you can simplify your life a bit, by coding all serialnumbers in one experiment and let Opensesame try all, until one of them works. Like that, you don't need to have a version for every lab pc. Something like this should do:

from pygaze import settings
serialnumbers = [1, 2, 3, 4]
while True:
    num = serialnumbers.pop()
    # the try code is tried. If it fails, the except part is executed. 
    # if it doesnt fail, it continues with the else statement 
    try: 
        settings.TRACKERSERIALNUMBER = num
        # depending on when the serialnumber problem arises, you need to do more here
        # for example init the eyetracker:
        # exp.pygaze_init()
    except: 
        print('wrong number')
    else:
        print('correct number'
        break
    

Perhaps that helps a bit?

Eduard