On Fri, Jul 8, 2011 at 11:34 PM, Pedro Côrte-Real <[email protected]> wrote: > On Fri, Jul 8, 2011 at 9:54 PM, Paul Alfille <[email protected]> wrote: >> Thanks for the report -- I found the error with DS2409 aux/main directories. > > That's great, thanks! Is there anything else I should try to debug the > humidity stuff? I've also just gotten a broken value for the pressure > sensor so I suspect there is some generic timing bug in the way my > installation work. Would any of the flextime/altUSB options be worth > trying?
For some reason the hobbyboard humidity readings are particularly prone to this. I've had almost 600 wrong readings in just a couple of days. Anything else I can gather to help debug this? One thing I did find odd in the code but is unrelated is that the temperature compensation for the HIH4000 seems to be using the same formula as for the HIH3600 instead of its different one as presented here: http://owfs.org/index.php?page=temperature-compensation From ow_2438.c FS_Humid_3600: humidity_uncompensated = (VAD / VDD - (0.8 / VDD)) / .0062 ; temperature_compensation = 1.0546 - 0.00216 * T ; OWQ_F(owq) = humidity_uncompensated / temperature_compensation ; FS_Humid_4000: humidity_uncompensated = ((VAD/VDD) - 0.16) / 0.0062 ; temperature_compensation = 1.0546 - 0.00216 * T ; OWQ_F(owq) = humidity_uncompensated / temperature_compensation ; Whereas from the owfs.org page HIH3600: RH = (Raw RH) / ( 1.0546 - .00216 T ) HIH4000: RH = (Raw RH) / ( 1.0305 + .000044 T - .0000011 T^2 ) Copy/Paste error? The difference is significant, of the order of 2 percentage points of humidity, much larger than the actual temperature compensation tends to be. Pedro ------------------------------------------------------------------------------ All of the data generated in your IT infrastructure is seriously valuable. Why? It contains a definitive record of application performance, security threats, fraudulent activity, and more. Splunk takes this data and makes sense of it. IT sense. And common sense. http://p.sf.net/sfu/splunk-d2d-c2 _______________________________________________ Owfs-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/owfs-developers
