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Comparison of WS80 wind speeds against Davis VP2

GW1000 WiFi gateway
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mcrossley
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Weather Station: Davis VP2/WLL
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Re: Comparison of WS80 wind speeds against Davis VP2

Post by mcrossley »

Ah! You are probably right, that will have 2.5 second updates as that is determined by the SIM, just a shame it is sooo expensive when compared to the Ecowitt units. Maybe Ecowitt should make a Davis compatible version!
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HansR
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Re: Comparison of WS80 wind speeds against Davis VP2

Post by HansR »

mcrossley wrote: Wed 11 May 2022 10:01 pm ... just a shame it is sooo expensive when compared to the Ecowitt units.
Second that. My Davis solar sensor broke and it would cost me € 200 to replace. I bought a whole Ecowitt ecology for less than that and added some extra sensors. I can buy a lot of batteries and have a lot of thoughts about Ecowitt improvements for that economic difference. If Davis wants to survive, they must become more economic. Their advantages are not that big. Yes Ecowitt sometimes annoys but really what is the weight of annoyance?

And having said that: many thanks for the effort of making the Ecowitt supported by CMX.
Hans

https://meteo-wagenborgen.nl
https://meteo-wagenborgen.nl/CMX4
CMX build 3182 ● Ecowitt GW1100/WS80/WH40 ● RPi 3B+ ● Raspberry OS 5.10.103 ● Mono 6.12.0.122
CMX build 40xx ● Ecowitt GW1100/WS80/WH40 ● RPi 4B ● Raspberry OS 5.15.32 ● .NET 6.0.1
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mcrossley
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Joined: Thu 07 Jan 2010 9:44 pm
Weather Station: Davis VP2/WLL
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Re: Comparison of WS80 wind speeds against Davis VP2

Post by mcrossley »

HansR wrote: Thu 12 May 2022 6:46 am ... for the effort of making the Ecowitt supported by CMX.
... despite their best efforts to make it much harder than it should be! :lol:

The direction deviated a bit yesterday after I posted that graph above...
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compare-vp2-ws80-dir2.jpg
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I did have a thought about the lower gust speeds for the WS80. The spec says that it only samples for 1 second out of the 4.8 seconds interval when the wind speed is above 11 mph (5 m/s). I wonder if it is just missing them? There again the Davis gust is the average over 2.5 seconds. I don't really understand why they only sample for 1 second above 5 m/s, below 3 m/s (6 mph) they sample for 4 seconds. Seems weird to me, especially as gusts are normally a 3 second average.
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mcrossley
Posts: 9968
Joined: Thu 07 Jan 2010 9:44 pm
Weather Station: Davis VP2/WLL
Operating System: Buster Lite rPi
Location: Wilmslow, Cheshire, UK
Contact:

Re: Comparison of WS80 wind speeds against Davis VP2

Post by mcrossley »

Looking at the first gust graph and this one to a lesser extent, the WS80 gusts seem to match or exceed the VP below that 6 mph threshold. Above that they only very occasionally match or exceed.
.
compare-vp2-ws80-gust2.jpg
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