Hi,
Cumulus MX (v3.0.0 (3038)) on my Pi has suddenly gone a bit haywire for wind direction. The average bearing seems to be okay, but the bearings swing wildy between set compass points. See attached for detail.
Rebooted Pi, rebooted indoor unit, next to reboot is outdoor unit when I get up onto the roof, but from the set behaviour this looks like a Cumulus thing?
Thoughts? Ideas? Seen it before?
Thanks
Dan
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Latest Cumulus MX V4 release 4.4.2 (build 4085) - 12 March 2025
Latest Cumulus MX V3 release 3.28.6 (build 3283) - 21 March 2024
Legacy Cumulus 1 release 1.9.4 (build 1099) - 28 November 2014
(a patch is available for 1.9.4 build 1099 that extends the date range of drop-down menus to 2030)
Download the Software (Cumulus MX / Cumulus 1 and other related items) from the Wiki
If you are posting a new Topic about an error or if you need help PLEASE read this first viewtopic.php?p=164080#p164080
Wind direction trend and rose issues on MX
Moderator: mcrossley
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Dan
- Posts: 10
- Joined: Fri 22 May 2015 10:06 pm
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- Operating System: Raspbian Jessie
- Location: Wellington, New Zealand
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Wind direction trend and rose issues on MX
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steve
- Cumulus Author
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Re: Wind direction trend and rose issues on MX
Unlikely to be Cumulus. This is a common 'feature' of Fine Offset stations. Have you observed the wind vane when this happens? It's likely that you'll see it constantly changing direction, possibly even spinning around in circles.
Steve
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AllyCat
- Posts: 1132
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Re: Wind direction trend and rose issues on MX
Hi Dan,
Yes, that's absolutely typical for a "Fine Offset" (the manufacturer) weather vane. The predominance of the 8 "major" directions (N , NE, etc.) over the 8 minor (NNE , ENE, etc.) is because the major directions are detected by one of 8 magnetic reed switches. The minor directions require two adjacent reeds to close and the moving magnet isn't strong enough! It can be improved by adding one or more magnets to the rotor.
The vane rotor is also very "lively" and again on this forum there are suggestions on how to "damp" its movement. I guess you are only noticing it now, either because the "averaging" time has changed in your (software) setup, or simply the wind currently has more turbulence than usual (or the speed might be very low and the direction is changing a lot).
I happen to be developing a purely "electronic" (microcontroller hardware) project which can "clean up" the output from the FO Vane. Perhaps I will post details soon, but don't hold your breath.
Cheers, Alan.
Yes, that's absolutely typical for a "Fine Offset" (the manufacturer) weather vane. The predominance of the 8 "major" directions (N , NE, etc.) over the 8 minor (NNE , ENE, etc.) is because the major directions are detected by one of 8 magnetic reed switches. The minor directions require two adjacent reeds to close and the moving magnet isn't strong enough! It can be improved by adding one or more magnets to the rotor.
The vane rotor is also very "lively" and again on this forum there are suggestions on how to "damp" its movement. I guess you are only noticing it now, either because the "averaging" time has changed in your (software) setup, or simply the wind currently has more turbulence than usual (or the speed might be very low and the direction is changing a lot).
I happen to be developing a purely "electronic" (microcontroller hardware) project which can "clean up" the output from the FO Vane. Perhaps I will post details soon, but don't hold your breath.
Cheers, Alan.
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endfm
- Posts: 17
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Re: Wind direction trend and rose issues on MX
Hey,
I've got the same weather station this happens to me when the wind is turbulent, wind station is about 90m above SL even when the wind is strong The only time I've seen the wind vain working is when there's constant wind and no real gusts. I've seen it switch from N to a fierce southerly and the wind direction graph is bang on.
but yes, what AllyCat said in regards to damping the wind vain down would be an advantage!
cheers
I've got the same weather station this happens to me when the wind is turbulent, wind station is about 90m above SL even when the wind is strong The only time I've seen the wind vain working is when there's constant wind and no real gusts. I've seen it switch from N to a fierce southerly and the wind direction graph is bang on.
but yes, what AllyCat said in regards to damping the wind vain down would be an advantage!
cheers