correct - the API description has 0x03, 0x04 and 0x05 for dew point,
wind chill and heat index, but the GW1x00/GW2000/WN19x0
consoles/gateways do not calculate them for the API response -
therefore, until now, 0x03 thru 0x05 won't be found in an API response.
The live data view of the WS View (Plus) app only shows FeelsLike and
Dew point because WS View Plus calculates them. Same with this data in
the Ecowitt cloud (which is read by the Ecowitt app) - they are
calculated there and not sent by the console.
On 15.10.2023 11:21, gjr80 wrote:
Just to clarify, the Ecowitt gateway device Data Exchange TCP protocol
(aka the Ecowitt gateway device API) includes provision for wind chill
and heat index, but I have not yet seen a gateway device that actually
provides such data. The Ecowitt gateway device driver passes these
fields through to the corresponding WeeWX fields, but of course this
only occurs if the gateway device actually provides the data. The
easiest way to confirm what is coming from the hardware is to run the
driver directly using the --live-data command line option, eg for a
setup.py install:
$ PYTHONPATH=/home/weewx/bin python -m user.gw1000 --live-data
or for a package install
$ PYTHONPATH=/usr/share/weewx python -m user.gw1000 --live-data
this can be done while WeeWX is running. (note you may need to replace
/python/ with /python2/ or /python3/ depending on your system).
If you see heatindex or windchill then it was provided by your
hardware, if they do not exist then your hardware did not provide heat
index and wind chill data. If the latter then almost certainly the
heatindex and windchill field values you saw were calculated by WeeWX.
Note the default StdWxCalculate settings for the heatindex and
windchill fields is prefer_hardware, which means WeeWX will default to
heat index and wind chill from the station if available, otherwise
WeeWX will attempt to calculate them. Note the prefer_hardware setting
is different to the hardware setting.
Bottom line is if WeeWX was already calculating heatindex and
windchill then I suspect your issue is the veracity of your
temperature, humidity and/or wind speed data (ie the source data for
calculating heat index and wind chill).
Gary
On Sunday, 15 October 2023 at 01:05:33 UTC+10 [email protected] wrote:
hi
Ok thanks for the advice and information i will put it into
software calculation
On Saturday, 14 October 2023 at 13:27:22 UTC+1 Rainer Lang wrote:
nothing is "amiss" in the "WS90 software", whatever you mean
by this.
I think you have a wrong understanding of the hardware you are
using and its (assumed) capabilities.
1. Tom's hint will solve your issue in weewx, as the
observations you are asking for are not primary observations
but derived observations - they are calculated from primary
observations - either by a console of by the data logging
software (here weewx).
2. The WS90 sensor array portion which reads the values from
which wind chill and heat index etc. can be derived is the
T/RH sensor. It reads the outdoor temperature and air
humidity. More the sensor doesn't do. The console, be it a
GW1000/GW1100/GW2000/WN19x0/WH2650, processes the observations
from the sensor array (wind, wind direction, rain rate, solar
and outdoor T/RH) and creates certain derived values like dew
point.
What the sensor reads can be found in the sensor specification
- the same is true for the console: its output is defined by
the API definition. If you want to know details, read
https://www.wxforum.net/index.php?topic=40730.0 chapter 13:
the Ecowitt Gateway API (application programming interface)
aka GW1000 API
There you will see that heat index, humidex, feels like, wind
chill etc. are not part of that output.
Weewx has the possibility to calculate these values from the
basic observations => [[calculations]] where you can tell
weewx not to expect these values from the console/driver (=
hardware) but to do the calculations itself ( = software)
On 14.10.2023 14:03, Tom Keffer wrote:
See the documentation, section [[Calculations]]
<http://www.weewx.com/docs/usersguide.htm#[[Calculations]]>.
So you would end up with something like:
[StdWXCalculate]
...
[[Calculations]]
...
windchill=software
heatindex=software
On Sat, Oct 14, 2023 at 12:56 AM [email protected]
<[email protected]> wrote:
I have noticed that my heat index value is constantly
lower than the windchill value.
This value is set to hardware generation so assume
something is amiss inside the WS90 software.
What’s the best way to rectify it swap to software
generation or swap the bindings between windchill and
heat index?
Thanks for any advice
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