Add windchill information about bresserweathersensorreceiver HOT 14 CLOSED

Hi, I found some interesting side here:
https://www.brunweb.de/wetterstation-berechnungen/

Regards
Frank

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Added perceptive_temperature() in BresserWeatherSensorReceiver/src/WeatherUtils.h and BresserWeatherSensorReceiver/src/WeatherUtils.cpp. (1f1f97a)

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Sure it is possible from a technical point of view. I am confident that someone has done this before. Did you search for a possible implementation (maybe on Github) which can be adopted?
At first glance, there are two possible approaches - a rather time consuming floating point calculation (which should not be done on each and every data frame) or a table look-up (maybe with linear interpolation).
Besides, it is a little bit out-of-scope with respect to this library. It seems rather to be application specific.
Regards
Matthias

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https://de.m.wikipedia.org/wiki/Windchill

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Hi,

I have added BresserWeatherSensorReceiver/src/WeatherUtils.h and BresserWeatherSensorReceiver/src/WeatherUtils.cpp.
You can try it by copying both files in the same directory as you *.ino file and adding #include "WeatherUtils.h"to your sketch.

Best regards
Matthias

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Hi, I tried to implement, but I get result 0.0:

sprintf(&domo_payload[strlen(domo_payload)], ";%.1f", calcwindchill);

What did I made wrong?

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Or is it because there i no wind currently?
Than windchill should be set to actual temperature, what do you think?

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You have to pass parameters in the function call: calcwindchill(weatherSensor.temp_c, weatherSensor.wind_avg_meter_sec)

And: The windchill formula is only valid if temperature <= 10°C and windspeed >4.8 km/h!

Maybe you should try calheatindex() today if you live in Germany or anywhere else in Central Europe! ;-)

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Or is it because there i no wind currently? Than windchill should be set to actual temperature, what do you think?

Yes, if the conditions are not met, the actual temperature should be returned. I will add this later.

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Ah, I am learning.
I add now:
if (weatherSensor.temp_c >=11) {
sprintf(&domo_payload[strlen(domo_payload)], ";%.1f", calcheatindex(weatherSensor.temp_c,weatherSensor.humidity));
}
if (weatherSensor.temp_c <=10) {
sprintf(&domo_payload[strlen(domo_payload)], ";%.1f", calcwindchill(weatherSensor.temp_c, weatherSensor.wind_avg_meter_sec));
}
And get now a heatindex that seems to be OK

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Almost correct! ;-)

Windchill: Results are valid for temperatures <= 10°C and windspeeds >4.8 km/h only!
Heat index: Results are valid for temperatures >= 16,7°C and humidity >40% only!

This can be combined as "Gefühlte Temperatur" or "Feels like xx°C"

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Hmmm,
maybe this will work?

if ((weatherSensor.temp_c >=16.7) && (weatherSensor.humidity > 40)) {
sprintf(&domo_payload[strlen(domo_payload)], ";%.1f", calcheatindex(weatherSensor.temp_c,weatherSensor.humidity));
}
else if ((weatherSensor.temp_c <=10) && ( weatherSensor.wind_avg_meter_sec *3.6 > 4.8)) {
sprintf(&domo_payload[strlen(domo_payload)], ";%.1f", calcwindchill(weatherSensor.temp_c, weatherSensor.wind_avg_meter_sec));
}
else {
sprintf(&domo_payload[strlen(domo_payload)], ";%.1f", weatherSensor.temp_c);
}

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