richardd 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
I played around with this in high school. You need an instementation
operational amplifier which will give you three leads to subject ,Ground
and the difference electrodes, ground goes to the base of the skull and
the other two electrodes need to be spaced 3" or so apart. I found a
velcro strap would hold all three in place two on forehead one in
back.were talking millivolts here so shielded probes with wet type
(little sponges) electrode's are needed. Converting the information
recieved Ie: four distinct freq bands with varying amplitudes into a
perceptible yet not terribly annoying feedback signal is the second most
important design requirement. Stick with pink noises or single emission
point lights as even an analog needle causes subtle movements of the
head causing electromyographie interference with the
electroencephalographic signals .Have fun Tony M.