Dear all, which is the best value for the active resistor you have found out during your experiment? I'm just approaching the GSR, I tried with the default value (40KOhms) and I always got (I placed the two electrodes to the index and middle fingers) RAW ADC values close to 4095.
Thanks, raffaele 2012/4/2 mike healy <[email protected]> > Hi, > > When using ShimmerConnect you should see two GSR values in the "Control" > window, i.e. "GsrRaw" and "GsrResistance". The second value gives the GSR > in ohms. > > See the attached document for the method used to get the ohms values from > the raw ADC and range values. > > An implementation of this can be seen in the Gsr.calcResistance() function > here: > http://code.google.com/p/tinyos-main/source/browse/trunk/tos/platforms/shimmer/chips/gsr/GsrP.nc > or in the ShimmerConnect source code (which is available to Shimmer > customers on request). > > Mike > > > > On Mon, Apr 2, 2012 at 2:09 AM, Sensors Capstone 2012 < > [email protected]> wrote: > >> Using ShimmerConnect with the Shimmer GSR unit, we get outputs between >> 1000 and 3000. These appear to be an output of an ADC. We have tried >> searching all shimmer documentation, but cannot find how to convert these >> back into ohm, depending on which GSR range we are in {0, 1, 2, or 3}. >> >> Can anyone shed some light on how to convert the values back into ohm? >> >> >> Thank You, >> SC >> >> _______________________________________________ >> Shimmer-users mailing list >> [email protected] >> https://lists.eecs.harvard.edu/mailman/listinfo/shimmer-users >> >> > > _______________________________________________ > Shimmer-users mailing list > [email protected] > https://lists.eecs.harvard.edu/mailman/listinfo/shimmer-users > >
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