Hi all, I'm using a Shimmer2r GSR Sensor to monitor user's Skin Resistance. I installed the tinyos apps example SimpleGSR (from here http://tinyos.cvs.sourceforge.net/viewvc/tinyos/tinyos-2.x-contrib/shimmer/apps/SimpleGSR/ ).
The confusion appears when I read the instruction in the Shimmer's documentation about how to calculate GSR from ADC value: - In the documentation, it says that the GSR can be calculated by using a linear function with TWO coefficients, also given in the documentation. - Whereas, in the file /opt/tinyos-2.1.1/tos/platforms/shimmer/chips/gsr/GsrP.c which is used by the SimpleGSR app, I found that the GSR value is calculated by using a linear function with FIVE coefficients. Moreover, these FIVE coefficients seem to have nothing in common with the other TWO coefficients given in the Shimmer's documentation. So, my question is: which set of coefficients should I use to calculate the GSR value? Thank you very much for your reply. Have a nice weekend to all !!! :-D Cheers, Ha.
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