marles77
marles77
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- marles77
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- Poland
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Comments
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@JerryWzc try this one, it is based on brainflow:https://github.com/marles77/openbci-brainflow-lsl Marcin
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@danielmont19 you can use my script https://github.com/marles77/openbci-brainflow-lsl as a template.
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@paulasaavedra, I send both the trigger and EEG signal via separate LSL streams and merge them in Lab Recorder (it writes everything to one XDF file). I did not try to use accelerometer channels because I need several different triggers and I can co…
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Hi Paula The method described by @wjcroft is the best if you need perfect synchronization of markers with eeg. I also use Psychopy but I send markers via Arduino and LSL. The delay is just a few miliseconds but photoresisitor is a must. If you just…
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Understood. Thanks very much. Regards Marcin
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OK, that makes sense. So, do I understand it correctly, that each chanel/signal oscilates around 0 and all that is needed is to multiply values (microvolts) by -1? Or is there any additional constant value that needs to be taken into account? Sorry …
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@wjcroft Hi, What would be a preferable way to reverse the reversed polarity in this case? Connecting electrodes to the top pins or maybe recalculating brainflow data? If the latter one is better, what would be the best method and time for it? Ma…
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Hi @retiutut I think we might want to put this in the official OpenBCI Github account in a new or existing repo. Sure, no problem. BTW, I found that the solution from openbci gui repo using queue module causes considerable timing prob…
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Hi @superhenrikke, you may take a look at my repo: openbci-brainflow-lsl. The script allows to record both EXG and AUX data, plus you can use it with Arduino sending exernal markers. It works on Windows (I did not test it on Mac or Linux) with Cyton…
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I believe that they refer to the mismatch between timestamps that I mentioned in this post. As far as I know this is no longer a problem, but the OpenBCI team will explain that better. Anyway, the above mentioned EEG-Notebooks project seems to be ba…
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Hi, One quite simple way to synchronize two inputs (EEG and events) is to use LabStreamingLayer https://labstreaminglayer.readthedocs.io/info/intro.html It provides API for different languages/technologies including Java and MATLAB (I guess there…
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This was the first thing I noticed when started using GUI 5.0.4. I also run it on Win 10 (v2004) and write the data to SD. It happens from time to time (I don't see any pattern). The only solution is to go back to the Control panel and switch off a…
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So basically, adding a short (0.1 sec) delay fixed the problem as you had said. Channels were set properly, signal was sent over LSL with no glitches, extra noise etc. However, I have one last question. I use Cyton with Daisy attached. Even if I sen…
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As you have already pointed out: The radio link is provided by TWO RFduino's, one on the dongle, and the other on the Cyton mainboard. Additionally the dongle has an FTDI usb interface chip. All of these devices have buffering constraints, and…
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I've prepared a simple modification of that Brainflow code and I'm going to test it after the weekend. The adventage of this situation is that I learned a lot:) I reviewed all the firmware and the Brainflow package, and eventually know how this whol…
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That's right, I purchased my Cyton+Daisy together with eeg cap through the Openbci shop exactly on 13 July 2020. The order number was 8982. I checked if it worked after shipment, but I actually started to use it only ~2 months ago. These settings ar…
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Thanks, that was a good summary. I added another comment there referring to what you had written.
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Thanks for explanation. Yes, that's exactly what I'm going to do with that brainflow code. What concerns me is that you've failed to replicate this issue. I wonder how many users will have a similar problem in future. Thanks for your time and all th…
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@wjcroft William, can you please, take a look at the attached log file. I guess that this message came from the dongle when I tried to set multiple channels at once (using openbci_lsl because it gives full info after each command). My questions are:…
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@wjcroft I had some problems with that openbci_lsl due to an old pylsl library. I'll try the code sent by Richard, which seems the best option since it apparently gives some control over Cyton channels.
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OK, I'll try to do that tomorrow. So far I used this Python script, but I can try with Brainflow as well. However, what about the recordings performed under v4.2? They are consistent. I posted just one sample but I have made tens of such recordings.…
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I use openBCI mainly for educational purposes. Recording EEG data for further ERP analysis while viewing actual EEG/EOG/EMG signals, demonstrating how filters work etc. is quite important for me.
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It's a bit confusing. So, the option you provide in GUI is not advised?
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Well, it seems the only solution for me at the moment.
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Thank you for prompt reply. Yes, it is closed but the problem remains. I think I have documented it quite thoroughly. According to R. Waltman it is not a GUI issue. It may be the firmware or hardware issue. However, how would you explain the differ…