Cyton V4? Simultaneous EEG, EMG, ECG. [resolved]
Are there any plans for Cyton v4, i see that github shows current hardware version as V3. Is there any tentative date when V4 will be released?
Are there any plans for Cyton v4, i see that github shows current hardware version as V3. Is there any tentative date when V4 will be released?
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Hi BioPotential,
No new Cyton revisions are in progress that I know of.
Regards, William
Ok, thanks for the info, I vaguely remembered reading on these forums that V4 would solve the limitations of V3.
What limitation are you concerned with?
Like measuring ECG, EEG and EMG with 1 Cyton.
For eg. if I have a 3 electrode ECG(LA, RA, LF, RLD) , 3 lead EEG in referential montage , 2 electrode EMG, will all of these measuments be simultaneously possible on a single cyton board?
Yes, this can be done using the ADS1299 Settings. See this section in the old tutorial,
https://github.com/openbci-archive/Docs/blob/master/Tutorials/01-Cyton_Getting Started_Guide.md#4-launch-the-gui-and-adjust-your-channel-settings
My understanding is that some of this section will be brought over to the new document repo. Mentioning Richard @retiutut.
https://github.com/OpenBCI/Documentation/issues/16
As you can see this can be done with the GUI interface. But it can also be done via serial port SDK commands:
https://docs.openbci.com/docs/02Cyton/CytonSDK#channel-setting-commands
Lol @wjcroft, I was just reading this and thinking as such.
Agreed with William that this is possible and highlights a strength of the OpenBCI platform: customization.
A hybrid setup needs to be included in the Docs, and I will make this a higher priority. @BioPotential Can you or William provide more details on electrode placement, building on the setup mentioned above?
@wjcroft. Thanks for the info, not checked the links yet but hopefully they would solve the issue, will ping back if anything more needs to be resolved.
@retiutut I presented a scenario where I felt that the cyton could not be used, I would be needing to connect the cyton in this configuration. For electrode placement, let me look around, because I cannot really confirm the definitive placement of electrodes for EEG.
For ECG the 4 electrode placement would be LA, RA, LL, RL (with Right leg being the bias electrode),
EMG it would probably depend on what muscle the user wants to measure the 2 electrodes would then be placed on that muscle, let me confirm where.
I guess @wjcroft would be in a better position to give a definitive answer to these.
Also one more concern I just realised is that for ECG we will be placing the bias electrode on the leg, but EEG is measured on the scalp, will the distance of the bias electrode affect the EEG readings?
After you look at the previous links, see if you have any questions. Those links show how to disconnect the common reference (SRB2), from the rest of the channels used in ECG, EMG. Each channel on the ADS1299 has a plus and minus pin. Once disconnected from common reference, then the extra pin is used as reference for that channel. Pins are numbered IN1N ... IN8N for the normal default set of pins closest to board. IN1P ... IN8P are farthest from board. In the default setup, the P pins are bussed together as SRB2, used as the common reference for the N pins.