Well, again, it's only my opinion. But I doubt that any simple
open-loop thermistor or CDS cell is particularly linear or
repeatable from device to device. However I am often mistaken...
In any case I would set up the sensor in a known environment
like the one I eventually want to measure, let it stabilize,
and see what I got for a reading. For extra credit I would
vary the environment over the range I expect and plot the
response. Do this with a few different sensors and you'll see
how mistaken I can be.
Once the parameters are known then an adjustment table could
be built into the client, or even fancier, into each mote
using the EEPROM. I don't know of any existing programs that
do any of this though.
MS
Bart Braem wrote:
Michael Schippling wrote:
I believe the getting started guides have formulas for converting the
raw ADC readings to temp and light and stuff, but I wouldn't put a lot
of faith in their accuracy until you calibrate your particular sensor.
One important question there: how does one calibrate a sensor in general?
Can it be done using TinyOS?
Bart
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