Four years ago, Indonesian scientists developed a 32 channel EEG headset by reading out for Front-End Analog to Digital Converter (ADC) ADS1299EEG-FE with daisy chain algorgorithm: https://www.researchgate.net/publication/332321992_Development_of_electroencephalography_EEG_data_acquisition_system_based_on_FPGA_PYNQ Event today heroic developer still struggle to solve this problem in the www.openbci.com forum : https://openbci.com/forum/index.php?p=/discussion/1198/question-about-ads1299-daisy-chain-with-stm32 But they failed with the the 3.th ADS1299 as for instance laumung …
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