On Saturday, November 21, 2020 at 9:31:11 AM UTC-8 [email protected] wrote:
> [email protected] 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 [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/fccfe641-03d1-473f-910a-c1f0d7aa2cabn%40googlegroups.com.
