Vantage Vue wind cup size setting with wee_device

[Philip Kutzenco]

Now that I have my external website operational (https://wx.kutzenco.com) with a Mosquitto MQTT broker and Belchertown skin, I'm spending a bit more time reviewing the weeWX documentation to get a deeper understanding of my system. I'm hoping to do some customization.

I have a Davis Vantage Vue weather station and weeWX running on a Raspberry Pi Zero W. I see that the Davis Weatherlink software gives the options for wind cup size as Small, Large or Vue/Other. That Davis documentation says that Vantage Pro systems generally ship with large cups, and that (obviously) Vantage Vue systems ship with Vue cups.

The wee_device --help command mentions only Small and Large options for wind cup size. Is there an option for Vue/other cups? I don't know what is adjusted in the readings/calculations by specifying different cup sizes. I didn't see that called out in the weeWX documention. I suspect the difference is minimal, but, just to ensure that everything can be set properly with weeWX does that option need to be added to wee_device for Vantage systems, if it isn't there?

phil

[Thomas Keffer]

A Vantage (whether a Vue or a VantagePro) ships with a value in the EEPROM firmware that matches its cup size. Unless you change the cups, there is no reason to mess with this value. The wee_device utility option is there if, for some reason, you have to change the cups.

To answer your question, the Davis documentation lists only two sizes: small and large. If there's a third "Vue" sized, I haven't heard of it. You'd have to ask Davis.

-tk

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[Philip Kutzenco]

Thomas,

Thanks for the reply. I won't worry about it. The reason I asked is that the help file for Davis' Weatherlink software shows three options. See the attached screen shot I took for setting that in the console with Weatherlink. Evidently, you can set a VantagePro to use small cups or Vue/Other cups. I'll just leave the value as it is set in the console without setting it explicitly.

phil

[Thomas Keffer]

Thanks, Philip. That's the first reference I've seen to "Vue" cups. As I said, you'd have to ask Davis.

But, in any case, don't worry about it. Only under extraordinary circumstances do you need to set it.

-tk

[Gary Strand]

I know this is an old thread but is precisely the question I have. "wee_device" reports the cups as "large", but the cups on my sensor don't seem large to me. Are the "small" really tiny?

Just curious because what counts as "extraordinary circumstances"? On the day of the Colorado Marshall Fire, I recorded a gust of 49 mph when other stations were reporting much higher numbers; is this such a circumstance?

Thanks!

[Tom Keffer]

The console has no way of knowing what size wind cup is mounted on the ISS. Someone has to tell it. Generally, that is done by the factory when they ship the unit out. Under "extraordinary circumstances" a user might have to do this if, for example, s/he changed the cup size.

I have only owned (and seen) the regular "large" size, so I don't have anything to compare it to. You'd have to ask Davis what size cup you have.

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[Gary Strand]

Looks like the value can only be changed via the console if one has a VP2, not a VUE ISS. So, "large" they are!