We previously suggested this architecture based on PiEEG: https://forums.raspberrypi.com/viewtopic.php?p=2178452#p2178452 But PiEEG developer Ildar Rakhmatulin has pulled PiEEG with 8 channels from the market before it has been released: https://www.crowdsupply.com/hackerbci/pieeg#products We therefore suggest to build 32 channel EEG devices from this architecture: Together with this architecture: