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I recently ran across a new open-source (or is it source-available?) EEG board that looks interesting: the Cerelog ESP-EEG.
Cerelog ESP-EEG development board in action
At its heart is the Texas Instruments ADS1299 (24-bit, 8-channel) analog-digital converter, the same chip the OpenBCI Cyton uses.
So what's different or better about the Cerelog? From my perusal of the materials, it seems that the selling point is cleaner signal due to true closed-loop active bias, at a price point close to the price of the OpenBCI when it launched (less than half the price of the Cyton now).
Software support includes a fork of the OpenBCI GUI (via Lab Streaming Layer) and Brainflow.
The project is by former SpaceX hardware engineer Simon Hakimian.
Git repository with firmware and schematic here:
⇒ https://github.com/Cerelog-ESP-EEG/ESP-EEG
Product page:
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