Ildar Rakhmatulin and Sebastian Volkl’s paper PIEEG: Turn a Raspberry Pi into a Brain-Computer-Interface to measure biosignals was published earlier this month. You can also check the project out on GitHub:
This project is the result of several years of work on the development of BCI. We believe that the easiest way to get started with biosignals is to use a shield. We will try to reveal the process of reading EEG signals as fully and clearly as possible.
See the paper here

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