Paul Alfille <paul.alfille <at> gmail.com> writes: > The humidity sensor as first published in "Sensors" magazine by Dan > Awtrey used the HIH-3600 sensor and the VDD and VAD pins of the > DS2438. > > See http://www.elin.ru/files/pdf/1-Wire/humsensor.pdf -- it's nicely written. > > In my naivety I created a humidity file off the main DS2438 directory > calculating humidity using this circuit. It confused people who had a > DS2438 not set up for humdity (I think they hoped to get humidity for > free) but worked with all the extant humidity sensors. > > Once Honeywell upgraded to the HIH-4000 and others used the HTM1735 I > had a bit of a problem. For backwards compatibility the main humidity > stayed calculated assuming the HIH3600, but to be accurate you need to > know your sensor design and use the correct humidity reading: > > HIH3600/humidity > HIH4000/humidity > HTM1735/humidity > and now > DATANAB/humidity > > Because the DATANAB identifies itself, I can have the main humidity > point to DATANAB/humidity if it's a DATANAB design, and > HIH3600/humidity otherwise.
Now, this is somewhat confusing.. I have now humidity over 100% when using HIH-4000: cat 26.3FDA21010000/HIH4000/humidity: 104.108 cat 26.3FDA21010000/HIH3600/humidity: 98.9952 cat 26.3FDA21010000/HTM1735/humidity: 91.5156 So which one is the correct result? ------------------------------------------------------------------------------ Special Offer -- Download ArcSight Logger for FREE! Finally, a world-class log management solution at an even better price-free! And you'll get a free "Love Thy Logs" t-shirt when you download Logger. Secure your free ArcSight Logger TODAY! http://p.sf.net/sfu/arcsisghtdev2dev _______________________________________________ Owfs-developers mailing list Owfs-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/owfs-developers
