From: Doug Sutherland (wearable_at_earthlink.net)
Date: 2001-11-29 23:35:13
Andreas,
> The HC11-board is probably obsolete by any standards, that's
> why it is so hard to find.
There are still plenty of HC11 boards around, but yes
they are expensive.
> The OpenEEG project is based on a single-chip microcontoller
> with internal 10-bit A/D-converters that costs around $10.
I guess I need to look at the latest design. The last one I
looked at used no microcontroller (the ADCcom thing with the
555 timers). I am convinced that microcontrollers are the
only way to go for data acquisition.
> Look at www.atmel.com. The processor family is called
> AVR 8-bit RISC.
hehehehe. I've been trying to sell the idea to Jim of
ditching HC11 and moving over to Atmel AVR.
> The current design can be found here:
> http://sourceforge.net/projects/openeeg
Questions:
1) What is the frequency band width of the current design?
2) What is the common mode rejection ratio in dB?
3) What sampling rates have been demonstrated?
4) Are you guys going to make some PCBs and sell them?
5) How much has been done on software for the above?
6) Is anyone working on Linux software for this?
>
> someone has built a working prototype I am sure. On the
> software-front, there is very little to be found at the
> moment, except
http://www.realization.org/page/topics/electric_guru.htm
Ah yes, that is Rob's work, I spoke with him on the
telephone some time ago about this stuff. He has delved
pretty deeply into spectral analysis. I wish I could
hook a parallel cable to his mind and load all of his
spectral analysis data into my brain. Hey Rob, do you
have a DB25 port on your mind? USB? Firewire?
> Also, there's no source to it. My guess the biggest
> part of the project is software development.
This is where most of thee hard work lies. I am a
software guy. How can I get myself up and running with
the current design? Can it be breadboarded? Is there
any software for the PC side yet?
> http://www.biosemi.com/publications/artikel7.htm
> That's basically the headstage used in the OpenEEG-
> design. If you download the design from Sourceforge,
> you'll find that link on the schematics. :-)
Interesting. I wish I knew how to build those active
electrodes described on the Biosemi site ...
-- Doug
This archive was generated by hypermail 2.1.4 : 2002-07-27 12:28:32 BST