Simple Program Review

[PB11]

Hello All

I'm hoping I can get someone's opinion on this little program.

I've previously run this successfully without the else, but I found as my wife came home and I was in the kitchen it triggered the changing of my kitchen to coming home lighting.

I've now created a second PB Arriving Home which will not change the kitchen lighting if one of us is home.

What I'm not certain about is what triggers the assessment of the "else" statement.

My assumption is that the "Else" will not be considered unless the "If" is triggered by the changing of our geofence status and the "If" criteria not being met . Is this correct, or will ISY run through it based on something else?

When is it correct to group "if" statements in "(   )"

Thanks very much

[MrBill]

This Program Runs when either geofence changes state.  Assuming that iNeighborhood is an Interger variable it will not run when the variable changes state. (however, if it was a State variable it would also run when the variable changes state.)

When it runs it will evaluate all 3 conditions to either true or false.  When all 3 are true the THEN block will run, OTHERWISE the ELSE Block will run.  So in a nutshell, if EITHER geofence changes state, then EITHER "Then" or "Else" will be executed.

16 minutes ago, PB11 said:

When is it correct to group "if" statements in "(   )"

Grouping with ( ) causes what's inside the () to be evaluated first. (just like algebra)

so if you put the 2nd and 3rd elements in your above IF statement in ( ) then the iNeighboorhood condistion would only apply to APiPhone. 

[PB11]

 

Ok, clear on the (). Thanks for that.

Regarding the "If", 

49 minutes ago, MrBill said:

So in a nutshell, if EITHER geofence changes state, then EITHER "Then" or "Else" will be executed.

So PB geofence changing to false, and AP Geofence still at false, will execute "Else". So this would result in my light coming on when no one is home?

[MrBill]

10 minutes ago, PB11 said:

So PB geofence changing to false, and AP Geofence still at false, will execute "Else". So this would result in my light coming on when no one is home?

Yes.   If EITHER change then ALL are evaluated.

Most of the time if you have AND (or even sometimes OR) in an IF statement you won't want to use the ELSE. (it will run too often since it runs anytime any portion of the IF statement is false.  Instead write a second program with inverted IF logic for what your wanting to put in Else.

[MrBill]

BTW... since you're using Locative and the Portal nodeserver, you might want to revisit the wikipage and add the HOME folder node (step 4).   @Javiand I recently corrected Step 4 so that it makes better sense.

Essentially by adding Location, you get a third condition that is True if EITHER of you are Home, and false if NEITHER of you are home. 

This greatly simplifies what you're trying to do above.

[PB11]

28 minutes ago, MrBill said:

Instead write a second program with inverted IF logic for what your wanting to put in Else.

 

Really, that easy? And this would cover either of us home and one arriving home.

20 minutes ago, MrBill said:

BTW... since you're using Locative and the Portal nodeserver, you might want to revisit the wikipage and add the HOME folder node (step 4).

Ok, before I go any further on this, I'll definitely check it out. Thanks very much.

[PB11]

Wait, I think this is what I already have set up.

Or is this something different?

[PB11]

Maybe its the way I'm utilizing it in the programs that needs to be adjusted. Rather then looking at it as an individual status, the "Home" dictates the status.

Ok. I'll try a few tests.

 

[PB11]

Wait, that wouldn't let me set conditions based on one person already home or me just arriving home.

The "LakeHouse" status would be True when the "If" statement is assessed in either situation. Correct?

I will keep the universal "home" status in mind though. I hadn't considered that.

[MrBill]

right, if you want to know if someone is already home

If lakehouse is true

and PB is true

would mean someone is already home

Unfortunitly

If lakehouse is false

and PB is true

will never work because if PB is true at least one person is home and lakehouse will also be true.