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Texas Instruments also can provide and gerbers files for produce PCB boards? Also software to read data and signal processing? No Datasets etc NO

Yes:

You are just making money selling $60 parts you bought too many of for $350.

It is open-source project, you can take all data from PiEEG GitHub and make device yourself. Try do it for 60$ and let me know could you do it

The chip itself, which dictates the design, is $60. Making multiple accounts does not disguise your writing style.

exactly, it is inly chip!! it is only ADC,

It is only forum, it is not the Gerber files And it is not framework for microcontroller!!!!

If you read the forum, it links the gerbers.