At 04:57 AM 3/22/97 -0800, you wrote:
>hi all
>
>does anyone out there know where i can get information on biofeedback
>such as monitoring points, waveforms, voltages, temperature and the pic
>processor.
> i'de like to build a brain wave analyzer with a pic processor that has
>an infra red link to my computer can anyone help me in anyway with this
>project
>thank you
>richard
>


Circuit Cellar, Inc. has an available board that measures and displays
brain waves.  I do not believe their version uses a PIC.  They are still
marketing this board, just check out their web site or a recent issue of
the magazine.  Monitoring brain waves is not an easy task.  The signal
strengths are very weak and the 50/60 HZ power line fields really
interfer badly.  While I do not want to discourage you from your quest,
 please be aware that your biggest battles are going to be in the analog
area.  You will need low-noise opamps and complex analog filters before
you have a signal even close to good enough to input into a
microcontroller.  Once you overcome the analog portion, the
microcontroller stuff will not be hard due to the low frequencies of
these signals.  You should be able to do  extensive DSP work on these low
frequency signals with a modest PIC.  Good Luck

 ----- Steve Miller