Looking at KCAORANG21, the WU is receiving low values for pressure on the hour, although with the WU, you never really know. But, given that you are cycling the wifi adapter at exactly the same time, odds are that the problem is on your end, rather than on the WU end.
I am not familiar with the wmii driver but, looking through its code, it ignores the checksum, so it's entirely possible it is receiving a bad packet on the hour, which gets decoded into nonsense values. The many bad values logged give evidence to this theory. For example, Sep 1 08:29:17 raspberrypi weewx[425]: engine: 2019-09-01 08:29:17 PDT (1567351757) LOOP value 'pressure' -29.33 outside limits (24.0, 34.5) Sep 1 08:29:17 raspberrypi weewx[425]: engine: 2019-09-01 08:29:17 PDT (1567351757) LOOP value 'outHumidity' 128 outside limits (0.0, 100.0) Sep 1 08:29:17 raspberrypi weewx[425]: engine: 2019-09-01 08:29:17 PDT (1567351757) LOOP value 'outTemp' 3276.7 outside limits (-40.0, 120.0) Sep 1 08:29:18 raspberrypi weewx[425]: engine: 2019-09-01 08:29:18 PDT (1567351758) LOOP value 'pressure' -29.33 outside limits (24.0, 34.5) Sep 1 08:29:18 raspberrypi weewx[425]: engine: 2019-09-01 08:29:18 PDT (1567351758) LOOP value 'outHumidity' 128 outside limits (0.0, 100.0) So, when weewx calculates the average pressure for the interval, it gets an off value. Incidentally, you're getting low values for other types, such as outside temperature. They are probably suffering from the same problem. You should contact the author of the driver. It really should use the checksum. Garbage in, garbage out! :-) -tk On Mon, Sep 2, 2019 at 8:14 AM William Webb <[email protected]> wrote: > You are correct I somehow got fixated on Humidity. The issue is > pressure. My station is KCAORANG21. My log is attached. > > On Monday, September 2, 2019 at 7:27:05 AM UTC-7, Thomas Keffer wrote: >> >> I'm not sure what we're looking at here. It looks more a plot of >> barometric pressure, rather than humidity. >> >> Or, is the issue the plot on the top (which is always zero)? >> >> Your WU station ID would be helpful. And, of course, the log. See the >> wiki article *Help! Posting to weewx-user >> <https://github.com/weewx/weewx/wiki/Help!-Posting-to-weewx-user>*. >> >> In short, you're not giving us much information. >> >> >> >> >> On Mon, Sep 2, 2019 at 7:00 AM William Webb <[email protected]> wrote: >> >>> This is a perplexing problem. I don't know enough about the structure >>> of weewx code or the Davis Monitor II driver to hazard a guess. My >>> station, a Davis Monitor II, running on a Raspberry PI B+ appears to be >>> working fine without drama. The PI has an IP assigned outside of DHCP on a >>> Spectrum Gateway router. I have always had stability issues between PIs and >>> Spectrum. I have avoided the random disconnects by running this on the >>> hour as a chron task. >>> >>> #!/bin/bash >>> >>> sudo ifconfig wlan0 down >>> >>> sudo ifconfig wlan0 up >>> >>> sudo service networking restart >>> >>> >>> I let the setup run several days before enabling posting to >>> Wundergound. My data when views on the web site locally looked fine. When >>> I looked at my data on WundergroundI discovered an anomaly with humidity. >>> After the chron task ran the humidity read low for one reading. >>> >>> [image: Wu_report.jpg] >>> >>> >>> This is beyond weird. Only humidity is off and it is only the first >>> reading after the network reconnect. What could be wrong? Have I >>> discovered some really subtle bug? If you folks think so, I can repost on >>> the development forum. >>> >>> >>> Bill - AB6OR >>> >>> >>> >>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "weewx-user" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> To view this discussion on the web visit >>> https://groups.google.com/d/msgid/weewx-user/1b8556bc-ea98-4b1c-b97d-06a95d075631%40googlegroups.com >>> <https://groups.google.com/d/msgid/weewx-user/1b8556bc-ea98-4b1c-b97d-06a95d075631%40googlegroups.com?utm_medium=email&utm_source=footer> >>> . >>> >> -- > You received this message because you are subscribed to the Google Groups > "weewx-user" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/weewx-user/7a219d4b-07d1-4757-8511-e1314619be57%40googlegroups.com > <https://groups.google.com/d/msgid/weewx-user/7a219d4b-07d1-4757-8511-e1314619be57%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/CAPq0zEBD_r9xPMywgeUnawswHdN-_EK%2BdEXjgmJuK_pFLraG-w%40mail.gmail.com.
