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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