Basic maths question

Setup, Configuration and Use Scripts & Rules
1

Hi,

I’m trying to modify the below rule to add some variance around the setpoint to prevent the fridge constantly hunting. In pseudo code, ideally keen write something like:

if (Curing_temp.state > Curing_temp_setpoint.state + 2) Fridge.sendCommand(ON)
if (Curing_temp.state > Curing_temp_setpoint.state - 2) Fridge.sendCommand(OFF)

but I can’t get it to work.

The currently working “dumb” rule is:

    rule "Curing Chamber Fridge Control"
    when
            Item Curing_temp_setpoint changed or
            Item Curing_temp changed
    then
            if (Curing_temp.state > Curing_temp_setpoint.state) Fridge.sendCommand(ON)
            else Fridge.sendCommand(OFF)
    end

Any advise on how to get something working would be greatly appreciated.

2

Something like this?

val Number maxTempTolerance = 2
val Number minTempTolerance = 2

 rule "Curing Chamber Fridge Control"
    when
            Item Curing_temp_setpoint changed or
            Item Curing_temp changed
    then
            if ((Curing_temp.state > (Curing_temp_setpoint.state + maxTempTolerance))  Fridge.sendCommand(ON)
            else if ((Curing_temp.state < (Curing_temp_setpoint.state - minTempTolerance)) Fridge.sendCommand(OFF)
    end
3

Thanks Alpoy, but no luck with that one.

4

Try adding the state as a number in your rule like:

(Curing_temp.state as Number)

5

That did it. Thanks so much for your help!