From: Doug Sutherland (wearable_at_earthlink.net)
Date: 2001-12-05 06:14:45
Hi Joerg,
Thanks for all of the great info ...
> DOS-mode is preferred, but WIN9X is possible, however with
> ugly artifacts due to multitasking in the background.
Yes, I've had similar problems with measuring seismic activity
using geophones and similar amp/filters. The only way to get
the timing right was to go DOS only. The multitasking nature
of windows and linux threw a wrench into the whole mess.
> Writing a Windows driver (similar to the gameport-driver)
> could bee a solution. However I have doubts, that the
> expenditure pays in the end.
Okay, well maybe it can be done, but I really think it's
better to use a uC to digitize. Therefore, I'm not really
interested in the designs without microcontrollers. I've
been down that road. There were lots of problems with
software on the PC end. I thing the 2-channel designs
with uCs are much better all things considered.
> For excessive filtering / FFT / audio-feedback synthesis
> however a real signal processor could be necessary...
Agreed. I'm actually not interested in a standalone
version, instead I want to connect either the RS232EEG
or ModularEEG to an embedded PC (PC/104) or perhaps a
StrongArm module like LART. I am however interested in
alternative feedback methods like audio and small text
LCDs, tactile feedback, etc. But if the desire is to
build a standalone version, I'm willing to work on
that because they kind of overlap, and I like the idea
of mobile/portable biofeedback devices.
> ACK.
> ACK.
Jeorg: don't take this the wrong way. I am very very
impressed with all of your work. I don't negate the
potential value of ComADC and the other designs that
don't use a microcontroller. But I think that if we
are going to invest a lot of time in software, then
it's better to focus on the RS232EEG or ModularEEG
designs. Then we can do some really spiffy software
similar to Brainmaster and WaveRider, and we can
make this an attractive alternative to those ...
> 4 unused ADC-channels (input range +-2V)
> 4 TTL-inputs (for switches e.g. for marking events by the user)
> 4 LED-driver outputs (e.g. for light goggles)
> 1 PWM output
> hardware UART
Excellent! I like this. I am really sold on the Atmel
based designs. That's where I want to focus. Thanks
again for sharing your work. This is exciting :)
-- Doug
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