From: Moritz v. Buttlar (info_at_baltic-microsolutions.de)
Date: 2001-05-08 18:10:26
Hi !
> Some questions. The hardware description for the TI
> competition seems to be different from the current
> design which is posted on the web. Is the final design
> going to be same as the TI article? Where is the final
> format of this article posted?
The TI-design is quite different from the current design on Joergīs page.
Which one will be the final design, depends on what we want :)
> I would like to comment on the design described in the article:
> 1. The stand alone capability of the eeg device is highly
> recommended. A portable palm sized unit lends itself
> for wider use. However, depending on sampling frequency
> and required resolution (0.5hz may be ok) at least a total
> of 500 bytes of dynamic FFT memory is required for the two
> channels which may have to be as external memory.
I fear that the microcontroller described in the article is a little bit too
slow and maybe we should try to implement a real DSP. Soon micorchip will
manufacture nice DSP-microcontrollers. Iīm really looking forward to this.
> 2. For the I/O interfaces,
> a) Apply a graphic LCD instead of the alphanumeric LCD. This
> will give you a graphic display capability. Mind Mirror
> and other functions can be implemented. No need for
> PC Monitor.
The cheap alphanumerical LCD allows custom-characters to be designed. Maybe
thatīs enough. Full graphics features would be expensive to implement (at least
30 USD). Itīs all a question about what people would pay for it. Whatīs our
price limit ?
> b) Add an LED goggle output for light
> c) Add Breath movement sensor (variable resistor strapped
> round the chest)
> d) Of course, once a plug in I/O (headphone, goggle etc)is available
> it has to be opt isolated it because people may connect it
> to other equipment which is live.
This could be implemented using the extension port.
> 3. For your software, please include
The software will be open source so that everybody can add what he/she wants :)
Moriitz
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