Hi, I'm the author of WLLDriver on Github. Yes, I think that *altimeter *is the good value. But I suggest to confirm that by directly ask Davis.
Regards, Le samedi 21 novembre 2020 à 22:31:04 UTC+1, kk44...@gmail.com a écrit : > I found that additional information at > https://www.manula.com/manuals/pws/davis-kb/1/en/topic/barometric-pressure-issues > . > > There they say, that Davis uses different calculations in different > devices: > > - VP2 and envoy consoles: sea-level pressure ("barometer", QFF) > - WeatherLinkLive: altimeter pressure ("altimeter", QNH) > - Vue consoles: user can choose between the two > > So it seems, the author of the "weatherlinkliveudp" driver read the > documentation most carefully. > > And to confuse the user or something, in the LOOP data record, Davis calls > the value, what we learnt is altimeter, "bar_sea_level". > > The archive record contains all the three values barometer, altimeter, and > pressure (I checked). Since the "weatherlinkliveudp" driver does not > provide a value for barometer, may be, WeeWX calculates it by itself. > > didier....@gmail.com schrieb am Samstag, 21. November 2020 um 20:54:45 > UTC+1: > >> Thank's a lot >> I'm learning a lot of things with you >> >> Le sam. 21 nov. 2020 à 18:59, vince <vince...@gmail.com> a écrit : >> >>> On Saturday, November 21, 2020 at 9:31:11 AM UTC-8 kk44...@gmail.com >>> wrote: >>> >>>> didier....@gmail.com schrieb am Samstag, 21. November 2020 um 16:09:22 >>>> UTC+1: >>>> >>>>> Ooops, after 10 mn the 2 values have diverged (only 1 mbar) >>>>> The explanation is that weatherlinkliveudp driver uses "altimeter" and >>>>> WLLDriver uses "barometer" for the station info >>>>> >>>> >>>> That I do not understand. Does the driver only retrieves the readings >>>> from the hardware, doesn't it? So, which way the driver can influence >>>> which >>>> values is displayed? >>>> >>>> >>> >>> There are two pressure-related elements provided by the Davis hardware. >>> One is the pressure as reported by the sensor, the other is the pressure >>> corrected to sea-level pressure based on your altitude. The driver code >>> defines which sensor values it uses for what generic weewx database element >>> >>> Both drivers map 'bar_absolute' from the hardware to weewx 'pressure' >>> in the database. >>> >>> But...the two drivers map 'bar_sea_level' from the hardware to >>> different elements in weewx's database. >>> >>> - WLLDriver.py puts the value into 'barometer' in weewx >>> - weatherlinkliveudp.py puts the value into 'altimeter' in weewx >>> >>> According to >>> https://github.com/weewx/weewx/wiki/Barometer,-pressure,-and-altimeter, >>> the correction math differs slightly, so I'd expect slight differences >>> perhaps. A difference of 1 mbar to me isn't something to worry too much. >>> You're talking 0.1 percent offset. The sensor itself isn't that precise to >>> begin with. >>> >>> >>> -- >>> 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 weewx-user+...@googlegroups.com. >>> >> To view this discussion on the web visit >>> https://groups.google.com/d/msgid/weewx-user/fccfe641-03d1-473f-910a-c1f0d7aa2cabn%40googlegroups.com >>> >>> <https://groups.google.com/d/msgid/weewx-user/fccfe641-03d1-473f-910a-c1f0d7aa2cabn%40googlegroups.com?utm_medium=email&utm_source=footer> >>> . >>> >> >> >> -- >> Quel temps fait-il à Auffargis <https://meteo-auffargis.decoodt.eu> ? >> > -- 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 weewx-user+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/c278a6af-f77f-4abc-9610-3d34bdc9a5a1n%40googlegroups.com.
