Item changed / How much did it change?

Setup, Configuration and Use Scripts & Rules
1

Hey guys,
I am wondering if anyone has done anything with being able to determine how much a value has changed?

For instance. I have an item that is currently watching the value of a house. I have a rule that notifies me when that value changes. But I would like to know as well how much it changed from the last value.

Any thoughts?

2

If you use persistence you should be able to get the previous value and do whatever you need to do to work out how much it has changed by.

3

I have mysql persistence setup. Do you have an example of how I get that previous value?

4

I have a rule that sets the away temperature when it detects I’m no longer home and a rule that sets it back to the previous value when I return. Here’s a snippet:

var varPreviousState = bedroom_temp_target.previousState(true)
logInfo("presence ON", "previous state: " + varPreviousState.state.toString)
5

Got it! I now have an item and a rule the monitors the value of my house and tells me when the value changes and how much it changed. All using the zillow api.

Now I get notices of when to be sad about how upside down I am on my house. :laughing: