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 var chillCount = 4
rule "Windchill_Calculate"   //  thx to @Udo_Hartmann for the Rule-Body  and @dmaillie for the math-stuff - 2019-01-13
when 
        Item LocalWeatherAndForecast_Current_OutdoorTemperature received update
then 
    if(!(LocalWeatherAndForecast_Current_WindSpeed.state instanceof Number))
    {
        logWarn("windchill","Windspeed not of Type Number!")
        return;
    }
    if(!(LocalWeatherAndForecast_Current_OutdoorTemperature.state instanceof Number)) 
    {
        logWarn("windchill","Temperature not of Type Number!")
        return;
    }
     var speedCurrent = Math.pow((((LocalWeatherAndForecast_Current_WindSpeed.state as Number).floatValue) * 1.0), 0.16) 
          //logInfo("windchill","Speed: " + speedCurrent)
     var tempCurrent = (LocalWeatherAndForecast_Current_OutdoorTemperature.state as Number).floatValue
        //logInfo("windchill","Temp: " + tempCurrent)
    owm_localCurrentWindchill.postUpdate(13.12 + 0.6215 * tempCurrent - 11.37 * speedCurrent + 0.3965 * tempCurrent * speedCurrent )
    chillCount ++
    if (chillCount >= 4)  // logInfo every 2 hours (or every 4th time) - Temperature is updated every 30 Minutes by another Rule/Binding(LocalWeatherAndForecast_Current_OutdoorTemperature)
    {
        logInfo("windchill"," I'm still alive")
        chillCount = 0
    }
end

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Bridge openweathermap:weather-api:api "OpenWeatherMap Account" [apikey="47110815irgendwiemeineAPI", refreshInterval=30, language="de"] {
    Thing weather-and-forecast local "Local Weather And Forecast" [location="47.11,8.15", forecastHours=3, forecastDays=0]
    Thing uvindex local "Local UV Index" [location="47.11,8.15", forecastDays=7]
}

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DateTime localLastMeasurement	"Timestamp of last measurement [%1$tY-%1$tm-%1$tdT%1$tH:%1$tM:%1$tS]"	<time>	{ channel="openweathermap:weather-and-forecast:api:local:current#time-stamp" }

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Number LocalWeatherAndForecast_ForecastHours03_ForecastedTemperature_Test "Temperatur in 3h [%.1f °C]" {channel="openweathermap:weather-and-forecast:cf12b36a:local:forecastHours03#temperature"}

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2020-04-25 17:47:38.574 [INFO ] [el.core.internal.ModelRepositoryImpl] - Refreshing model 'owm.items'

==> /var/log/openhab2/events.log <==

2020-04-25 17:47:38.609 [.ItemChannelLinkAddedEvent] - Link 'LocalWeatherAndForecast_ForecastHours03_ForecastedTemperature_Test-openweathermap:weather-and-forecast:cf12b36a:local:forecastHours03#temperature' has been added.

2020-04-25 17:47:38.619 [vent.ItemStateChangedEvent] - LocalWeatherAndForecast_ForecastHours03_ForecastedTemperature_Test changed from NULL to 12.58

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Bridge openweathermap:weather-api:api "OpenWeatherMap Account"     [apikey="dein-ApiKey", refreshInterval=30, language="de"] {
     Thing weather-and-forecast local "Local Weather And Forecast" [location="41.xxxxxx,6.yyyyyyyyy,502", forecastHours=120, forecastDays=0]
     Thing uvindex              local "Local UV Index"             [location="41.xxxxxx,6.yyyyyyyyy", forecastDays=7]
}

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Image  LocalWeatherAndForecast_Current_Icon              "Wetterbild"        {channel="openweathermap:weather-and-forecast:cf12b36a:local:current#icon"}

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        Image  item=LocalWeatherAndForecast_Current_Icon                          label="Wetterbild"