Sending X-10 code ONLY when condition changes

Falcon

Hello,
I am working on a security system project for my house using microswitches to monitor the condition of the door locks. Currently I have a microswitch attached to an X-10 Powerflash module that sends signals to my PC via a CM15A. I have Active Home Pro on my PC with the Active Phone Pro plug-in. I have the Active Phone Pro app on my Droid X that will let me change the modules, and will also display the current condition of all modules (ON or OFF.) I want to eventually monitor 6 doors and windows so I want to use the BS2e wto gather the condition of the sensors and send it to the PC, and ultimately my Droid X using the XOUT command. I want to avoid a bank of 6 Powerflash modules tying up all those outlets.

I have the basis of the code written but have the following question:

I want to minimize the number of XOUT commands sent to my phone so it doesn't continually receive updates that the same door is still locked. I want to ONLY send the ON and OFF codes when the condition changes. I assume I need to monitor the current condition of each door lock and set that as a variable but I'm at a loss for how to switch to monitoring the opposite condition once the lock condition in changed.

I have successfully used the XOUT commands before for a thermostat but that was several years ago and I haven't written any code since.

See code I've written so far in attachment, but not tested with circuit.

All replies are appreciated.

Falcon

RiJoRi

This is rather common in "micro-land." Pseudocode for it (I haven't worked with Stamps for a while) is:

Initialize:
        OldPins = ReadPins  ' Read the inputs you want (Masking may be needed)

Main:
        NewPins = ReadPins ' Again, masking may be needed
        IF NewPins <> OldPins THEN ' There's been a change
                OldPins = NewPins  ' Save the new reading
                ' Do your stuff
        ENDIF
        GOTO Main

HTH,
--Rich

Falcon

I finally did get the whole thing to work. Just a matter of saving the current state and comparing.

Thanks for the help RiJoRi

graffix

nice project. Do you have any other documentation or video?

Falcon

graffix,
Sorry for the delayed response. I'm out of the US right now with sporadic internet access.

I initially used the X-10 function to monitor my sensors over the internet using the Active Phone Pro software and app. It's actually a nice app but I want to eventually expand to more functions.
I've since switched to a PINK module and wrote a simple webpage to view the status changes. You can see a recent version of code in a thread called "Read state if INPUT in loop."
I'm a noob code writer so it's probably pretty clunky as far as efficiency...but I'm working on that.

falcon