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 <[email protected]> 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 [email protected]. > 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 [email protected]. For more options, visit https://groups.google.com/d/optout.
