the device could probably go wireless very easily using a PIC microprocessor... the trick though is seeing how GSR actually changes during REM... if it's the frequency in rise and fall, we'd measure distance between peaks and signal REM... if it's a matter of the value in GSR, we measure that and signal REM accordingly... but this is what we're trying to figure out first and foremost, how we can use a simple (and reliable) REM detection that doesn't need calibration.

Turning it wireless shouldn't be TOO hard... we skip the voltage to frequency part, we skip the computer connectivity and we shove the voltage (with minor modifications probably) straight into a PIC. IF however we still want the computer (which would allow for many benefits, such as biofeedback, light machine, etc) we'd have to figure out a way to either make the sound wireless (through a wireless earphone port probably) or... something else...

For now, we're taking the baby steps

And speaking of baby steps, i took two books out of the library that show me how to build medical-grade GSR's (the ones that sell for muy muy expensive)... Of course, they only cost some... 10$ to build, at most. The tough part to build though is the sensors... Not that it's that hard, but because you need to use silver for the probes. Of course, we don't need THAT much accuracy (and either ways we're not measuring the GSR per-se, though we'll get a pretty close value if we do the math... we're measuring the fluctuations in GSR.)...

So, all this to say two things:

1) I have a pretty good idea of how to build a good and reliable GSR amp, do the proper math and actually know the values in ohm of the skin resistance (from the frequency)... This will be computer math mostly, but at least i have a good understanding of how the computer math will be done... which i'll basically explain once i finish the device and I make sure the values I'll be passing on won't be theoretical only... All i need now is a way to figure out how to build a 32 khz (i think it was) oscillator for the frequency calibration hehe.

k... and the second point:

2) One of the books explains how to make sensors, what the good size for sensors is, where to place them, etc.. I'll scan the instructions (along with the important GSR schematics) and we can follow those instructions for the sensors, using something else instead of silver. (maybe when i build the sensors we'll be using, I can simply draw instructions to build them the way I did)...

So, the books I'm now recommending for electrodermal anything are

"Techniques in Psychophysiology" and "Electrodermal Activity in Psychological Research"... Both of which contain instructions for building a GSR and information on building the probes, like diameter of contact and issues to consider.

... just wanted to report on the daily development I guess we're getting real close... just like before lol, but i think this time we won't have problems with things I don't know anything about (ie I2C and HEX values and addresses) so we can't possibly get stuck... I hope hehe. Wow, I actually UNDERSTAND all of the electronics involved now, which is considerable progress I suppose....