Cyton Daisy board connection issues

ckoehlerckoehler
edited May 2017 in Cyton
Hi everyone,

I bought the OpenBCI 16 channel headset for a research project and ran into a bunch of trouble getting data from the headset. When I connect it to the GUI I only get a few sensor and most of them show railed. If I wiggle the connection pin on the board a bit I sometimes get a signal, which quickly goes away again. I was only able to get signals on all 16 sensors once, but as soon as I turned off the headset and turned it back on the sensor again failed. 

Did anyone encounter similar issue before? Is it possible this is a board issue? Or maybe the way I wired it?

Any help would be greatly appreciated.

Thanks,
Christian.

Comments

  • ckoehlerckoehler
    edited May 2017
    If it helps I took a picture of the current wiring in case thats the source of the error. Would be great if somebody has an idea what could be wrong.


    Thanks,
    Christian.
  • wjcroftwjcroft Mount Shasta, CA
    Christian, hi.

    Have you tried operating the headset with 8 channels only, without the Daisy? Does that look any different?

    William

  • wjcroftwjcroft Mount Shasta, CA
    Also, I assume you checked for good skin contact on all electrodes, ear clips. By adjusting the electrode screw positions.

    Do you have Ten20 paste and gold cup electrodes? You can also try a test with just a few cup electrodes on the scalp, see how that looks.

  • ckoehlerckoehler
    I didn't try the 8-Channel board alone yet, I'll do that today. But I don't have the gold cup electrodes instead the ones with the little spikes that turn the headset into a medieval torture device. I actually took the headset off and touched individual electrodes with my fingers and didn't get anything either. That actually confuses me since I should get some signal even if it's not very useful.

    Speaking of useless signals, by sheer luck I was able to collect about one hour of data from all 16 sensors and when I looked at the data I noticed something odd. The data was either flat or showed a regular sine wave. Especially the latter signal characteristic is odd since I never saw EEG data as regular as that. I conducted the experiments in an office, is it possible that the headset was picking up interference from power lines and whatnot?

    Thanks,
    Christian.
  • wjcroftwjcroft Mount Shasta, CA
    It sounds like your SRB2 (Reference) and Bias (Ground) leads at the earclips may not be connected correctly.
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