There are 3 known humidity designs that OWFS supports, including the
original one by Dan Awbry in Sensors magazine (implemented, in this case, by
AAG). See http://www.owfs.org/index.php?page=humidity
According to the documentation: "The MS-TW/MS-THW sensor uses an augmented
DS2438 chipset. The two models are
exactly the same except the MS-THW has a Honeywell humidity sensor." So
might be the same.
I'll test the AAG design again to corroborate that it is accurate, and then
we will have to get more information to properly support iButtonLink's
design.
Paul Alfille
On 3/16/07, Stephen Houser <[EMAIL PROTECTED]> wrote:
Is anyone else having problems getting accurate interpretation of
humidity values from the iButtonLink MS-TH (temperature and humidity)
sensors?
For sensors that are temperature only, humidity values come back as
negative numbers. It would be nice to not even show humidity as
available. Currently a negative number, which is out of range (0% to
100%) is reported and can easily be determined to be wrong.
For the MS-TH sensors, the readings are, very low. I get a reading of
~11% when a commercial humidity sensor reports ~23%. (o.k. that one
seems like a x2 would be the answer :-) Am I interpreting the data
incorrectly? Is there some magic formula that should be applied in
addition to what owserver does?
Stephen
----------------------------------------------------------------
Stephen Houser http://usm.maine.edu/~houser
Division of Information and Technology [EMAIL PROTECTED]
University of Southern Maine (207)780-4588
P.O. Box 9300 / 96 Falmouth St. N1SH
Portland, Maine 04103 -- U.S.A. (Earth) O-
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