The station is at a vacation home and I was there on Oct 14 so it is possible that I upgraded to 3.8.2 at that time. But it's curious that I see periods as short as 6 hours of similar behavior before the upgrade. Maybe the software algorithm couldn't calculate higher precision with the data available at the time.
I plot my wind vector with a 90 degree East offset. I noticed the new behavior when there was a prolonged period of steady wind made the plot look like a picket fence. Really disappointed at Davis for dropping resolution within their hardware. Thanks for the prompt answer! On Thursday, January 31, 2019 at 4:31:39 PM UTC-5, Thomas Keffer wrote: > > Hello, Mike > > Wind direction downloaded from the logger is limited to 22.5 degrees of > precision. > > Previous to V3.8.2, wind direction was always calculated in software, even > when hardware values were available, which could result in higher precision > (although not necessarily accuracy). See issue #336 > <https://github.com/weewx/weewx/issues/336>. > > Did you by any chance upgrade to V3.8.2 on 14 October? > > -tk > > > On Thu, Jan 31, 2019 at 11:42 AM Mike Ramsey <mikera...@gmail.com > <javascript:>> wrote: > >> I'm running Weewx 3.8.2 on a Raspberry Pi with Rasbian Jessie. Weather >> station is a Davis Vantage Pro2 wired. >> >> I'm getting the wind direction reported at only the major compass points: >> (0,22.5,45,67.5,90,112.5,135,157.5,180,202.5,225,247.5,270,292.5,315,337.5). >> >> This behavior started on Oct 14 but I can see periods in the archive where >> this also occurred in the past. For example, on May 5, 2018 it did this >> for a 6 hour period. >> >> What I expect, and what normally happens, is to report the full range >> from 0 to 360. >> >> A dump of the May 2018 period is below. >> >> The Vantage Pro displays wind direction down to the degree even when >> weewx is recording the quantized direction. This means the weather vane on >> the roof can measure and the data is getting down to the console. Why is >> weewx reporting less accuracy than is being measured? >> >> >> | 2018-05-05 00:00:00 | 26.8534531239994 | >> >> | 2018-05-05 00:15:00 | 40.1762746405119 | >> >> | 2018-05-05 00:30:00 | 31.8391669072265 | >> >> | 2018-05-05 00:45:00 | 27.6576423981335 | >> >> | 2018-05-05 01:00:00 | 45 | >> >> | 2018-05-05 01:15:00 | 0 | >> >> | 2018-05-05 01:30:00 | 0 | >> >> | 2018-05-05 01:45:00 | 0 | >> >> | 2018-05-05 02:00:00 | 0 | >> >> | 2018-05-05 02:15:00 | 337.5 | >> >> | 2018-05-05 02:30:00 | 315 | >> >> | 2018-05-05 02:45:00 | 315 | >> >> | 2018-05-05 03:00:00 | 315 | >> >> | 2018-05-05 03:15:00 | 315 | >> >> | 2018-05-05 03:30:00 | 315 | >> >> | 2018-05-05 03:45:00 | 0 | >> >> | 2018-05-05 04:00:00 | 315 | >> >> | 2018-05-05 04:15:00 | 315 | >> >> | 2018-05-05 04:30:00 | 315 | >> >> | 2018-05-05 04:45:00 | 0 | >> >> | 2018-05-05 05:00:00 | 0 | >> >> | 2018-05-05 05:15:00 | 0 | >> >> | 2018-05-05 05:30:00 | 0 | >> >> | 2018-05-05 05:45:00 | 22.5 | >> >> | 2018-05-05 06:00:00 | 45 | >> >> | 2018-05-05 06:15:00 | 45 | >> >> | 2018-05-05 06:30:00 | 67.5 | >> >> | 2018-05-05 06:45:00 | 67.5 | >> >> | 2018-05-05 07:00:00 | 67.5 | >> >> | 2018-05-05 07:15:00 | 54.2728729207129 | >> >> | 2018-05-05 07:30:00 | 59.2775430647446 | >> >> | 2018-05-05 07:45:00 | 62.1555767325972 | >> >> -- >> 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 <javascript:>. >> For more options, visit https://groups.google.com/d/optout. >> > -- 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. For more options, visit https://groups.google.com/d/optout.
