Rule to detect if device is on - is not working

Setup, Configuration and Use Scripts & Rules
1

Hi, i want to detect if my washer is working.

So i get the current power consumption by my knx-actor in mA.

But the rule is not working, the switch will not come to “ON”.

Can you have a look at my configuration files?

items:
Group Strom
/* Stromverbrauch */
Number Strom_Waschmaschine “Strom Waschmaschine [%.2f mA]” (Strom) { knx=“2/3/2” }
Number Strom_Trockner “Strom Trockner [%.2f mA]” (Strom) { knx=“2/3/3” }
Number Strom_Spuelmaschine “Strom Spuelmaschine [%.2f mA]” (Strom) { knx=“2/3/50” }

/* Gerätezustand Aus / Ein */
Switch Zustand_Waschmaschine “Waschmaschine Zustand” (Strom)
Switch Zustand_Trockner “Trockner Zustand” (Strom)
Switch Zustand_Spuelmaschine “Spülmaschine Zustand” (Strom)

sitemap:
Text item=Strom_Trockner
Text item=Strom_Spuelmaschine
Switch item=Zustand_Waschmaschine
Switch item=Zustand_Trockner
Switch item=Zustand_Spuelmaschine

rule:
//
import org.openhab.core.library.types.*
import org.openhab.core.types.Command
import org.openhab.core.persistence.*
import org.openhab.model.script.actions.*
import org.joda.time.*
import java.lang.Math
//

// Regeln für Zustandsüberprüfung - Waschmaschine Ein / Aus
//
rule “Waschmaschine Zustand Ein”
when
item Strom_Waschmaschine changed
then
if (Zustand_Waschmaschine.state==OFF) {
if (Strom_Waschmaschine.state > 0.20) {
sendCommand(Zustand_Waschmaschine, ON)
}
}
end

rule “Waschmaschine Zustand Aus”
when
item Strom_Waschmaschine changed
then
if (Zustand_Waschmaschine.state==ON) {
if (Strom_Waschmaschine.state < 0.10) {
sendCommand(Zustand_Waschmaschine, OFF)
}
}
end

I also tried “received update” instead of changed - but with no luck.

2

Could be a lot of things. I can’t address any KNX issues that might be the cause. In your rules I recommend the following:

  • Add logging statements and watch your logs to see whether the rules are even triggering. If not then you know the problem is your Item configs.

  • Add some explicit casts to your Number Item’s states just to make sure the rules engine isn’t doing something stupid. For example: if((Strom_Waschmachine.state as DecimalType).doubleValue > 0.20) {

  • There is no need to have two rules here.

You can combine them:

rule "Waschmaschine Zustand"
when
    item Strom_Waschmaschine changed
then
    logInfo("Waschmaschine Zustand", "Strom_Waschmaschine changed: " + Strom_Waschmaschine.state.toString + " Zustand_Waschmaschine = " + Zustand_Waschmaschine.state.toString)
    if(Zustand_Waschmaschine.state == OFF) {
        if((Strom_Waschmaschine.state as DecimalType).doubleValue > 0.20) {
            logInfo("Waschmaschine Zustand", "Setting Zustand_Waschmaschine to ON")
            Zustand_Waschmaschine.sendCommand(ON)
        }
    }
    else if(Zustand_Waschmaschine.state == ON) {
        if((Strom_Waschmaschine.state as DecimalType).doubleValue < 0.10) {
            logInfo("Waschmaschine Zustand", "Setting Zustand_Waschmaschine to OFF")
            Zustand_Waschmaschine.sendCommand(OFF)
        }
    }
end
3

Ok, i will give it a try.

Where can i see the messages from the log, created in this rule? In the openhab.log or in events.log? Or do i have to activate the debug mode first?

EDIT:
Is still not working. I can see 1.57 mA now in openhab, but switch is still “OFF”. No messages in openhab.log or events.log about this.

4

You should also be aware that as long as the switch (Zustand_Waschmaschine) hasn’t received any update or command since last reboot/startup the state could be “uninitialized” or “null” (if you haven’t configured persistence and restoreOnStartup) and therefore won’t match the conditions OFF or ON.

5

Yes, i know. So i changed the rule to

if … is “ON”

else …

Without any additional state conditions, so i get “ON” with the first “if” and all other states with the “else”.

But still nothing happens if the item number items changes. I switched the switches manually also, but the rule is not working.

I can see the number changing in the events.log, but no messages from the rule.

6

Change the when statement from:
item Strom_Waschmaschine changed
to
Item Strom_Waschmaschine changed

(Capital i/I)

7

Thanks man! That did it!!!

Now it works.