How to get more than 8 channels from multiple PiEEG 8 channel hats? – PETER GAMMA (Director & Physiologist), MEDITATION RESEARCH INSTITUTE SWITZERLAND (MRIS)

Last Updated on January 9, 2024 by pg@petergamma.org

To sample from two 16 channel OpenBCI modules at exactly the same time is not possible, this would require a hardware change.

https://openbci.com/forum/index.php?p=/discussion/3750/using-two-cyton-daisy-boards-with-one-brain-one-computer

We suppose it is possible to solve this problem without a hardware change with 2 PiEEGs.
PiEEG is a Raspberry Pi hat with a Texas Instruments ADS1299 EEG chip.
OpenBCI uses the ADS1299 EEG chip as well.
We did not yet study the architecture of the ADS1299 EEG chip and of PiEEG in detail.
We suppose it is possible to synchronize the clocks of two ADS1299 EEG chips located on two PiEEG Raspberry Pi hats located on two Raspberry Pi’s.
Electronic engineers welcome to solve this problem.
We suppose this is possible because it is possible to control the ADS1299 EEG chip on the PiEEG hat from a Pi.
But it is not possible to synchronize the clocks of different ADS1299 EEG chips located on different OpenBCI modules without a hardware change.
Data from the different PiEEGs could be synchronized if the Pi’s are connected to each other for instance over a wired ethernet cable.

If works what we describe here then it would be possible to build a professional multi-sensor EEG device with as many PiEEG as required. With OpenBCI this is not possible without a hardware change.

PiEEG with 4 channels are available right now, PiEEG with 8 channels: orders placed now ship Apr 29, 2024:

https://www.crowdsupply.com/hackerbci/pieeg#product

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