Calculated daily run time of a switch

Setup, Configuration and Use Scripts & Rules
1

Hi there

I want to log the daily run time (i.e. in minutes) of a warmer which I have connected to a switch.

The switch is simply defined in .items as “Switch Greenhouse_Warmer …” (it is coupled to a zwave flush switch) - and it is turned ON and OFF by a rule looking at temperature readings once every few minutes. That part all works.

How should I do this run-calculation most easily ? I am sure one of you guys have something like this and can share the code ?

I am on OH1 - but that is probably not relevant here…

2

I’m relatively new to OH and this might not be the best approach, but I would do something like this.

rule “add to count”
When
Time cron "0 0/1 * * * * "
then
if (device.state == ON){
var itemMinuteCounter = itemMinuteCounter+1
sendCommand(itemMinuteCounter,var)
}
end

You’d also need to set up persistence for itemMinuteCounter. I’m sure there are errors in my syntax, but hopefully this helps.

3

You may be able to pick up some ideas from this thread:

4

I have looked at the examples - and I do get how they are set up. It just seem far too complicated for what I am trying to achieve…?

Is there no simple formula where you can get the millis/minutes between two state changes of an item ? something like …now.timestamp minus previousstage.timestamp?

Creating cron jobs running every second or minute to check states seem like overkill ?

5

OK - came up with a better solution, inspired by older examples and google. Although the example has too much logging etc. - it does works and without running crons every second/minute:

rule "Drivhus2_Warmer started"
	when
		Item Drivhus2_Warmer received command ON
	then
		logInfo("DrivTemp", "Warmer on")
		postUpdate(Drivhus2_Warmer_LastOnState, new DateTimeType())
	end

rule "Drivhus2_Warmer stopped"
	when
		Item Drivhus2_Warmer received command OFF
	then
		var DateTimeType prevOnState = Drivhus2_Warmer_LastOnState.state as DateTimeType
		var Number execDuration = Seconds::secondsBetween(new DateTime(prevOnState.calendar.timeInMillis), now ).getSeconds()
		logInfo("DrivTemp","The warmer is now off after runnung for " + execDuration + " secs.")
		postUpdate(Drivhus2_Warmer_Last_Runtime_Sec, execDuration)
		var Number dailyTotalSeconds = execDuration + Drivhus2_Warmer_Today_Runtime_Sec.state as Number 
		postUpdate(Drivhus2_Warmer_Today_Runtime_Sec, dailyTotalSeconds)
		var Number dailyTotalMinutes = dailyTotalSeconds / 60
		postUpdate(Drivhus2_Warmer_Today_Runtime_Min, dailyTotalMinutes)
	end
	
rule "Drivhus2_Warmer Daily Reset"
	when
		Time cron "0 0 0 * * ?"
	then
		sendCommand(Drivhus2_Warmer_Today_Runtime_Sec, 0)
		sendCommand(Drivhus2_Warmer_Today_Runtime_Min, 0)
		logInfo("DrivTemp","Daily runtime counters reset to 0")
	end