issue with using BioEra + Brain Trainer with OpenBCI Cyton
Hi,
I recently bought an OpenBCI Cyton (in the last 3 months), and am interested in doing some basic Neurofeedback using Brain Trainer from Peter Van Deusen. I have tested the Cyton board with the OpenBCI GUI and I can get 8 channels of clear signal. However, with BioEra I'm getting some weird results. I'm using the OpenBCI device as the setup, and it is seeing the device. I'm on a Windows 10 device running BioEra Pro.
Basically it seems to be reading some activity but not clear waveform in the oscilloscope. If I tap on the leads on the OpenBCI, it does show electrical activity, but it doesn't produce an clear waveforms. As I mentioned there is no problem with the OpenBCI GUI.
Here is a couple images. You'll see in the Brain Trainer app, there is some info in the bar graph, but no waveform in the oscilloscope:
https://postimg.cc/gallery/j7JTVPQ
When I run the simulator as a source it produces waveform, so that's why I'm concerned there is an issue, but I'm just getting into this now, so maybe there is something that escapes me.
I read this thread on the BioEra forum http://www.bioera.net/support/viewtopic.jsp?id=551 and in this case it seemed related to firmware. I posted this on their forum as well. I'm not sure if that is the issue here, or perhaps there is something I need to adjust in the OpenBCI Device settings?
Any assistance would be greatly appreciated.
Thanks,
Kevin
Comments
KMC, hi. If you examine that thread you mentioned,
http://www.bioera.net/support/viewtopic.jsp?id=551
You can see the reference to "DC offset", which must be removed for (most, non ILF) OpenBCI Cyton designs. This is typically done by a bandpass filter say from .5 Hz to 45 Hz. This removes the large millivolt DC offset below .5 Hz.
It's most likely that the current Brain Trainer BioEra design misses this finer point for Cyton. The DC offset is not present with Ganglion.
Regards, William Croft
Hi William,
So I added the bandpass filter as you suggested from .5 to 45 in BioEra and it worked perfectly, so I reached out to the people at Brain Trainer, and I got in touch with the developer who did all the designs for the Brain Trainer for BioEra version. He added the bandpass to a separate design for me, that he had me replace the existing file with, and now I'm pleased to say I'm seeing a very clear signal in the software. So it should work well from here.
Thanks again for your help.
Best,
Kevin