Re: Newbie Questions

I am also pretty interested in getting started with eeg's. I think the
project on kickstarter -
https://www.kickstarter.com/projects/openbci/openbci-an-open-source-brain-computer-interface-fo
provides a good base to build on. However I think that building non contact
biopotential sensors is defintely an interesting area. The main problem
here is the movement artifacts, but what with the current trend of low cost
3d printing it can definitely be overcome.
The non-contacts sensors have been explored in several research papers,
howeever I still dont see a very active commmunity out there using such
products ?  I tried to build one of the capacitive electrodes using the
project located https://code.google.com/p/opendous/wiki/BioSensorPlatform
however since there were not too many people who were interested I ended up
not doing.

On Sat, Jun 27, 2015 at 9:04 AM, Martin Molina <[email protected]>
wrote:

> I should add that my primary interest is in machine learning/ai as applied
> to real time neural time series data. As such, I initially didn't want to
> get involved with the hardware and hoped that I could just purchase an eeg
> device. You probably know that there a serious gulf between the consumer
> level eeg devices (emotiv, openbci, etc) which run about $800 for developer
> kits. The These have 500-100 Hz sampling, 24 bit adc resolution on up to 16
> channels. On the other hand the research grade equipment (cognionics,
> quasar) have over 60 channels with dry electrodes! After emailing some
> sales reps I was dismayed to discover that they retail for round-abouts
> $40K! While I am quite novice at EE, it seems to me that the most expensive
> part of these systems are the adc chips which for high resolutions run
> about $50 for an 8 channel chip. Aside from the design labor necessary to
> route 64 channels worth of data efficiently through one or a few linked
> micro controllers which build packets and tx to a pc, I think that the
> other issue may be in designing electrode arrays which do not interfere
> with one another, though I have not yet researched this much yet (best
> believe that I will!)
>
> I think that a worthy goal for this forum could be to engineer one of
> these higher end systems, bringing openeeg up to speed with the times. I
> mean, the old design uses RS232 for goodness sake! One concern would be
> that the adc's alone for a 64 channel system could drive the cost from
> about $200 where it is now to well over $400 (which definitely beats
> $40k...) Anyhow, regardless of the intended application, having more,
> higher resolution data has its advantages. Since the current design only
> scales to 6 channels because of the Atmega8, perhaps a design that scales
> higher but can operate on as few as 8 or so would be optimal.
>
> Martín A Molina
>
>
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-- 
Regards,

Sabarish
www.dwindlingthumbs.com

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OpManager is web-based network management software that monitors 
network devices and physical & virtual servers, alerts via email & sms 
for fault. Monitor 25 devices for free with no restriction. Download now
http://ad.doubleclick.net/ddm/clk/292181274;119417398;o