It uses a Raspberry Pi and 4 shields, each contain a ADS1299 chip: https://scholar.google.com/scholar?hl=de&as_sdt=0%2C5&q=IEEE+SENSORS+JOURNAL%2C+VOL.+XX%2C+NO.+XX%2C+XXXX+2022+1+BEATS%3A+An+Open-Source%2C+High-Precision%2C+Multi-Channel+EEG+Acquisition+Tool+System&btnG= It uses a Raspberry Pi and 4 shields, each contain a ADS1299 chip: The scheme of 24-channel EEG acquisition in the daisy-chain mode. (B), (C) The front and back of the motherboard. (D), (E) The front and back of the ADC-board. …