Hi Greg,
Thanks for taking the time to respond.
The WH65B reports values for 'UV', 'UVI' and 'Light' as you can see in the
data coming through (shown below) when running rtl-433 from the command
line.
*_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _*
time : *2022-12-14 22:05:08*
model : *Fineoffset-WH65B* ID : *133*
Battery : *1* Temperature: *22.4 C* Humidity : *59 %*
Wind direction: *205* Wind speed: *0.0 m/s* Gust speed:
*0.0
m/s* Rainfall : *13.2 mm* UV : *83* UVI
: *0* Light : *10922.0 lux* Integrity : *CRC*
In my SDR device sensor map I am mapping the UV value to radiation, the UVI
value to UV. Those values seem to be landing in the 'intended' columns and
display nicely in repots with correct values assigned.
radiation = uv.133.FOWH65BAltPacket
UV = uv_index.133.FOWH65BAltPacket
luminosity = light.133.FOWH65BAltPacket
It is the value being reported as 'light' from the sensor that I'm
struggling with. It's currently I'm mapping that value to field I can
physically see in the database called luminosity. That stores data in the
database but the display shows no units and presents with 6 decimal
places.
After some searching through this group, I found the post referenced where
it sounded like there 'should' be a column called 'illuminance' which is
mapped to a group with the same name which uses lux as units. When I make
that mapping, weewx refuses to start - not surprisingly.
So that leaves me with 2 options - assume my database is 'incorrect' and
add a column (wee_database --add-column) called illuminance and remap the
light values to that column. The alternative is to add the existing column
to the illuminance group so it uses the correct unit and I can apply some
formatting. I guess I'm wondering if there are other options, and if not,
which of the methods is the "safest" in terms of playing nice with future
upgrades.
I'm just now looking up the command syntax to add a column and I notice
this example from the section on renaming columns - 'wee_database
--rename-column=luminosity --to-name=illuminance'. Maybe not a coincidence
that example is used? That's starting to lok like my third (and best?)
option.
Appreciate any guidance on what the intended design is here.
Thanks,
David
On Tuesday, December 13, 2022 at 11:09:32 PM UTC+10 Greg Troxel wrote:
>
> David Schulz <[email protected]> writes:
>
> > I recently upgrade my venerable WH1080 sensor to the WH65B sensor array.
> > I'm grabbing data directly using the SDR driver. Just having trouble
> > nailing down the correct sensor mapping for the lux values being
> reported.
> >
> > I'm looking at this post -
> > https://groups.google.com/g/weewx-user/c/7ouux0bviRE/m/u46MyYN5BQAJ,
> which
> > lead me to believe there should be a field called illuminance which maps
> to
> > the illuminance group which sets the units to be lux. It sounds like
> there
> > might have been a column called luminosity in the schema at one point
> but
> > it was replaced with illuminance?
>
> First, read this:
>
> https://github.com/weewx/weewx/wiki/Watts-and-lux
>
> > My database is using the extended schema but is still showing only a
> > luminosity column and has no illuminance column. I've just run a clean
> > install on a spare Pi and I'm seeing the same column names as my main
> > system.
> >
> > Contemplating whether I add a new column called illuminance or assign
> the
> > existing luminosity column to the illuminance group so that correct
> units
> > get applied. I'd appreciate any recommendations on which is the safer
> path
> > regarding things working cleanly with future upgrades.
>
> I am not at all clear on the details of those sensors.
>
> illuminance has units lux; it is human-perceived light falling per area.
>
> Luminosity is a radiometric unit (power) rather than photometric (human
> perception). And, it's total power from a source, which doesn't make
> any sense for a weather station:
>
> https://en.wikipedia.org/wiki/Luminosity
>
> The two things weather stations often measure are:
>
> illuminance in lux, super roughly 200 000 in full sun
> irradiance in W/m^2, roughly 1000 in full sun
>
> So the big questions are
>
> What is the measurement showing up in your luminosity column? What
> is being measured, with what units? What kinds of numbers do you see
> when the sun shines directly on the weather station, blue sky?
>
> Is something continuing to put data in that column? Why?
>
> Is "luminosity" being used in some code as a synonym (incorrectly) for
> "irradiance"?
>
> and then when you understand those answers you can figure out what to
> do, or post back with them.
>
>
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