From: Joel Eriksson (jen_at_ettnet.se)
Date: 2002-01-17 18:38:10
From: Joel Eriksson <jen_at_ettnet.se>
To: buildcheapeeg_at_yahoogroups.com
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Subject: Re: [buildcheapeeg] New schematic and layout
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On Thu, Jan 17, 2002 at 01:08:26PM -0500, Jim Meissner wrote:
> Dear Andreas:
>
> I just downloaded your latest work. Wonderful, Wonderful, Wonderful!
>
> Think the SMT TinyEEG board is great because you can use one board
> for a single channel machine, or two boards for right and left hemisphere.
It would be very nice to build the EEG as small and cheap as
possible and make a separate multiplexer that can be used to
stack multiple EEG-modules to allow for as many channels as
one wishes. Then only the multiplexer would have to be modified
when someone wishes to make other interfaces (USB, Firewire, IrDA,
whatever), which might be needed when increasing the number of
channels and discovering that RS232 is not fast enough, for example.
> My interest would be to add several more boards for EKG, GSR,
> temperature, respiration rate, etc.
That's a good idea. It would be great if the multiplexer could
handle the data from such modules too, that should not be a
problem if they communicate with equal baudrate I suppose. A
simple configurationfile could define what kind of modules
are on each channel and applications just register themselves
for the kind of data they can handle and doesn't have to
know about anything else.
It's probably obvious now that I'm more into programming than
electronics. :-) Is it at all possible / practical to use a
multiplexer as I have described? Would it be very expensive?
Of course, all modules should be able to connect directly to
a PC too if multiple channels are not needed.
-- Joel Eriksson
This archive was generated by hypermail 2.1.4 : 2002-07-27 12:28:36 BST