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Wind direction averaging
(13-10-2019, 22:45)Werk_AG Wrote:
(12-10-2019, 14:02)edr1924 Wrote: At the receiver end I added a 5 minute averaging of the wind direction (and speed also) so when I look at the display I know for sure where the wind is coming from.

Changing the RX code to averaging the wind speed doesn't seem to me to be a good idea, because this is already done on the TX before sending data. The TX units sends wind speed as ten and two minutes wind average which are the standard.
On the RX display, wind speed is the standard 10 minutes wind average.
Be careful when changing things on the code, specially if you intend to use it with any weather software such as Cumulus, you may be breaking standard measurements.

Regarding the wind direction, well, if adding the calculation of wind direction vector works better for you, its ok. Now you have something similar to predominant wind direction.
Anyway check the impact of using the sin and cos functions in memory usage.

Wind direction by nature changes very frequently, I use an high quality ultrasonic wind direction / speed sensor (Ventus 200A), which values are read digitally and I also get very frequent changes in wind direction, obviously not radical changes from N to S, but N to NNO or N to NNW are normal.

Very good points you made, thank you!

I'm aware of the implications and with those in mind it's great fun to adopt your most excellent system to my needs.

With a normal wind vane like the Davis 6410 I get readings in wind direction which varies immensely.  My wind vane is situated 1 meter above a roof top, 14 meters from ground level with no trees etc in the direct path of the wind.

But with lower wind speeds the vane will have it's own mind. If the wind direction is predominantly W for example, I can get easily wind directions varying from N to S and everything in between. 

If I want to go and take a walk I previously had to watch the display for a while to figure out the actual wind direction...

So my WU graph is now a lot cleaner and I can see the shift in wind direction much better during the day.
But even with the current 15 second average the variations are still too much so I consider 30 second average.
But as said, it's fun to play with these settings...

Messages In This Thread
Wind direction averaging - by edr1924 - 12-10-2019, 14:02
RE: Wind direction averaging - by Werk_AG - 13-10-2019, 22:45
RE: Wind direction averaging - by edr1924 - 15-10-2019, 13:41

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