Re: Arduino development possibility

Welcome to the OpenEEG list. I apologize that I cannot read or pronounce 
your name, as I only speak English.

You're very right when you acknowledge that it won't be easy :) The 
"typical" Arduino (ATMega8/168/322) only has less than 30 total GPIO 
pins, closer to 20. Processing the 4 or so channels we have is difficult 
enough to perform analog/digital conversions and all the serial 
communications in real time. An ATMega168 is only rated to 20MHz, after 
all (and often gets run at 16MHz).

192 electrodes! That's a whole lot of electrodes, a whole lot of paste, 
and a whole lot of data. I guess if you need that many then you really 
need that many.

So, I think that working on modifying the modularEEG design to 
accommodate that many inputs would need in some regards a complete 
reworking. There are some good parts of the project such as the way DRL 
and active probes are handled that can be used to your advantage. They 
have already been designed and tweaked, so I would imagine it better to 
not "reinvent the wheel" there.

A faster processor and enough I/O are two requirements. You will not 
necessarily need 192 GPIO as this can be very expensive to find in a 
microcontroller - utilizing discrete circuitry such as dedicated ADC's 
and multiplexers can reduce this number greatly. Atmel, manufacturer of 
the ATMega line, also makes other processors all the way up through 
FPGA's. The ARM architecture is also a possible route. The Cortex series 
can achieve good speeds and versatility at good prices. Think of mobile 
devices and how much power they can get with relatively little expense.

I wish you good luck! Keep in touch.

-Aaron

On 04/12/2013 07:20 AM, ??????, ???????? wrote:
> Hello to everyone and I hope I'm in the right place.
> I'm thinking of expanding the current openEEG capabilities to be able 
> to be used for lab purposes, professional use etc. for a project at my 
> university. I was thinking of 192 electrodes with enough analog 
> arduino inputs and a usb or serial exit to PC with all the data needed 
> by the currently existing openEEG software.
> I know it won't be easy but I'm willing to study, work and learn.
> I'll probably have to build my own arduino board, I don't think that 
> any with the specifications I need already exists.
> This is where you guys come in, do you think it's possible with 
> something like this or is it not powerful enough? Should I use 
> something else?
> Also, currently there are analog and digital boards, do you think it 
> would be easier if I used 2 arduinos? One for processing the analog 
> and one for the digital signals?
> Thank you in advance.
>
>
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Precog is a next-generation analytics platform capable of advanced
analytics on semi-structured data. The platform includes APIs for building
apps and a phenomenal toolset for data science. Developers can use
our toolset for easy data analysis & visualization. Get a free account!
http://www2.precog.com/precogplatform/slashdotnewsletter