Hey Mike,
Currently I have PROG_OUT high and SER0 low, I tried the 3 other cases
and they weren't really better. But this code really explains things a
lot more clearly. Maybe it's just a signal interference problem.
Anyway thanks for your help!
Richard
Quoting mike healy <[email protected]>:
Hi Richard,
By autorange I mean are you allowing the GSR module control the range. See
the GSR.controlRange() function here:
http://code.google.com/p/tinyos-main/source/browse/trunk/tos/platforms/shimmer/chips/gsr/GsrP.nc
So when you say your setting the PROG_OUT and SER0 pins in the code, what
exactly do you mean? If you are setting them both high then you are using
the 3.3MΩ range, which might explain why you are only seeing low ADC values.
There are 3 other ranges to try which might be more appropriate (see the
GSR.setRange() command in the above file).
Mike
On Fri, Aug 12, 2011 at 2:51 PM, <[email protected]> wrote:
Hey Mike,
Yes, they are raw ADC values, between 500-1500. I'm not sure what the
auto-ranging function is, but current I'm setting the PROG_OUT and SER0 pins
in the code, if that's what you mean?
Thanks,
Richard
Quoting mike healy <[email protected]>:
Hi Richard,
500-1500 what? Are these the raw ADC values?
If you are using the auto-ranging function turn it off and manually
control
the range until you find the optimum one.
If you are already do this I can't think of anything that you could do in
the code to improve resolution.
If you have the necessary skills in SMT rework, you could probably
substitute one of the resistors on the GSR daughter card for a more
appropriate value. To get details on what might be possible/advisable on
this you should contact [email protected].
Mike
On Wed, Aug 10, 2011 at 2:46 PM, <[email protected]> wrote:
Hi,
Currently my GSR values fall inside the 500-1500 range, with a lot of
quantization happening during smaller changes. So I was wondering if
there
is a way to change the resolution of the GSR module by adjusting either
the
resistance or the code, such that I could get a wider range and use a
different set of the polynomial coefficients to translate it?
Thanks,
Richard
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