[SOLVED] Trouble with Temp Conversion

Setup, Configuration and Use Beginners
1

Hi all, having issues getting a rule for Celsius to Fahrenheit converted. This is where I am.
Items:

Number Greenhouse_GreenhouseOne_AirTemperatureCelcius "Air Temperature C" <temperature> (gGreenhouseGreenhouseOne, gAirTemperature) {mqtt="<[broker:miflora/GreenhouseOne:state:JSONPATH($.temperature)]"}
Number Greenhouse_GreenhouseOne_AirTemperatureFahrenheit "Air Temperature F" <temperature> (gGreenhouseGreenhouseOne, gAirTemperature)

rule:

rule "Convert to Fahrenheit"
when
	Item Greenhouse_GreenhouseOne_AirTemperatureCelcius received update
then
	var Number current =  Greenhouse_GreenhouseOne_AirTemperatureCelcius.state
	var Number currentInFahrenheit = (current as DecimalType * 1.8) + 32
	logInfo("Temperature", "Greenhouse_GreenhouseOne_AirTemperatureCelcius received update: " + current + " in Celsius = " + currentInFahrenheit + " in Fahrenheit.")
	Greenhouse_GreenhouseOne_AirTemperatureFahrenheit.sendCommand(currentInFahrenheit)
end

sitemap:

Text item=Greenhouse_GreenhouseOne_AirTemperatureFahrenheit label="Air Temperature [%s F]" valuecolor=[>77="orange",>59="green",<=59="blue"]

in the log i get:

[vent.ItemStateChangedEvent] - Greenhouse_GreenhouseOne_AirTemperatureCelcius changed from 13.8 to 13.9

i have in the rule to loginfo but it does not log the change to Fahrenheit nor does it present in the sitemap.

1 Like
2

[SOLVED] As soon as I post this it works! I’ll leave it up for others to find.

3

You could trigger the rule from changed instead of every update, to slightly reduce workload.

4 
rule "Convert to Fahrenheit"
when
	Item Greenhouse_GreenhouseOne_AirTemperatureCelcius received update
then
	var current =  Greenhouse_GreenhouseOne_AirTemperatureCelcius.state as Number
	var Number currentInFahrenheit = (current * 1.8) + 32
	logInfo("Temperature", "Greenhouse_GreenhouseOne_AirTemperatureCelcius received update: " + current + " in Celsius = " + currentInFahrenheit + " in Fahrenheit.")
	Greenhouse_GreenhouseOne_AirTemperatureFahrenheit.sendCommand(currentInFahrenheit)
end

But if it is for display only the you can make use of the UoM

The item:

Number:Temperature Greenhouse_GreenhouseOne_AirTemperature "Air Temperature [%.1f °C]" <temperature> (gGreenhouseGreenhouseOne, gAirTemperature) { mqtt="<[broker:miflora/GreenhouseOne:state:JSONPATH($.temperature)]" }

The sitemap:

Text item=Greenhouse_GreenhouseOne_AirTemperature label="Air Temperature [%.1f °F]"

And the conversion will be done automagicaly