Re: [Openeeg-list] OpenEEG Questions

[Damián F. <nog...@gm...>]

I am sorry for the spam, but in my previous e-mail I said: "any of those
changes you proposed are possible" - that is false. One change you
mentioned was to feed raw data onto GPIO pins of RPi. That will not work,
because what you need to do with the signal is to convert it from analog to
digital data through ADC and RPi doesn't have an ADCs. You can avoid using
ATmega microcontrollers, but you still would have to use some external chip
with ADC functions. And then you would have to program your own firmware
and protocol, so you can use the data in applications running on RPi.
Though what you can do with RPi is to feed the data directly from ATmega
through native UART interface on RPi without the need for USB-UART chip.
But about that, I am not really sure about the signalling voltage mismatch
5V/3.3V. So it is still preferred to use a USB interface with UART bridge
like CP2102.

S pozdravom,
Damián Filo


so 5. 9. 2020 o 21:49 Yonah Elorza <yo...@gm...> napísal(a):

> Hello!
>
> I'm a computer engineer interested in making some modifications to the
> OpenEEG circuit, and had a few questions, if anyone is available to answer
> them. I've read through all the documentation on the website, and have
> worked with the OpenEEG platform for a few years now, and wanted to see if
> the following was possible:
>
> -Designing better noise cancelling to reduce commons noise, as well as
> noise between electrodes.
> -Integrating an FPGA into the design which acts as a hardware Fast Fourier
> Transform
> -Making the circuit modular enough that you can stack multiple together to
> have 4, 8, 16, etc. electrodes reading at the same time.
> -Long term: modifying the design of the circuit to work without the AT
> processor, instead having hardware control from the GPIO of a Raspberry Pi,
> and all data being fed raw to either the GPIO or USB interface of the Pi.
>
> If anyone has reasons this wouldn't be possible, or if you have
> suggestions for any of these changes, please let me know. I absolutely love
> this project, and would love to be able to contribute my own work to it.
>
> --
> Best Regards,
> Yonah Elorza
> Columbia School of Engineering | Class of 2018
> Computer Engineering
> Tel: ( <%28786%29%20205%20-%204304>305)-542-1735
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