... and that is indeed the default.

https://github.com/weewx/weewx/blob/master/weewx.conf#L370

On Sun, Jul 23, 2023 at 9:35 AM Invisible Man <[email protected]>
wrote:

> yes, that's what I did, and it works just great. IMHO, the default option
> should be "prefer_hardware" for everything. That should normally suit
> nearly all situations.
>
> -- Axelle.
>
> On Sunday, July 23, 2023 at 1:59:23 PM UTC+2 Tom Keffer wrote:
>
>> Yes. If you specify 'hardware', then WeeWX will not calculate it at all.
>> It depends on the value being supplied by the hardware.
>>
>> Usually you want "prefer_hardware". Same with the other calculations. I
>> would change them all.
>>
>> On Sun, Jul 23, 2023 at 4:07 AM Invisible Man <[email protected]>
>> wrote:
>>
>>> Hello Tom,
>>>
>>> I am using an EcoWitt HP2551 (station_type = Interceptor) and WeeWx
>>> 4.10.2
>>> In StdWXCalculate I have the following: I see that heat index is
>>> expected to be provided by my hardware (which obviously doesn't). I suppose
>>> I can just change that to software, or prefer_hardware?
>>>
>>> ```
>>> [StdWXCalculate]
>>>     [[Calculations]]
>>>         # Derived quantities are calculated by this service.  Possible
>>> values are:
>>>         #  hardware        - use the value provided by hardware
>>>         #  software        - use the value calculated by weewx
>>>         #  prefer_hardware - use value provide by hardware if available,
>>>         #                      otherwise use value calculated by weewx
>>>
>>>         pressure = prefer_hardware
>>>         barometer = prefer_hardware
>>>         altimeter = prefer_hardware
>>>         windchill = hardware
>>>         heatindex = hardware
>>>         dewpoint = prefer_hardware
>>>         inDewpoint = prefer_hardware
>>>         rainRate = hardware
>>>         maxSolarRad = prefer_hardware
>>>         cloudbase = prefer_hardware
>>>         humidex = prefer_hardware
>>>         appTemp = prefer_hardware
>>>         ET = prefer_hardware
>>>         windrun = prefer_hardware
>>> ```
>>>
>>> Thanks,
>>> Axelle
>>> On Friday, July 21, 2023 at 1:12:43 AM UTC+2 Tom Keffer wrote:
>>>
>>>> For most weather stations, heat index is a derived quantity, so it must
>>>> be calculated in software.
>>>>
>>>> What kind of hardware?
>>>>
>>>> What version of WeeWX are you using?
>>>>
>>>> What is in the section [StdWXCalculate] in weewx.conf?
>>>>
>>>> -tk
>>>>
>>>>
>>>>
>>>> On Thu, Jul 20, 2023 at 1:39 PM Invisible Man <[email protected]>
>>>> wrote:
>>>>
>>>>> Hi,
>>>>>
>>>>> My weather station has both current temperature and current humidity,
>>>>> but it continuously displays *N/A for humidex* (or is it heat index) ?
>>>>>
>>>>> My template uses this:
>>>>> ```
>>>>> Humidex: $current.heatindex
>>>>> ```
>>>>> and my `skin.conf` translates heatindex to Humidex:
>>>>> ```
>>>>>     [[Generic]]
>>>>>         # Generic labels, keyed by an observation type.
>>>>> barometer      = Barometre
>>>>>         dewpoint       = Point de rosee
>>>>>         heatindex      = Humidex
>>>>> ```
>>>>> I'm not sure I'm doing the right thing.
>>>>> If I query the database :
>>>>>
>>>>> ```
>>>>> sqlite> select barometer, pressure,outTemp,outHumidity,heatindex from
>>>>> archive where dateTime = 1689884400;
>>>>> 1010.28419008758|998.764391620552|24.8333333333333|93.0|<select
>>>>> heatindex from archive where dateTime = 1689884400;
>>>>> ```
>>>>> Notice I do have values for everything *except* heatindex (no value).
>>>>> Why don't I have any value? How can I enable it?
>>>>>
>>>>> Thanks
>>>>>
>>>>> PS. I'm using Weewx 4.10.2 on a RPi.
>>>>>
>>>>>
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>>>>> .
>>>>>
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