[How-To] Keychain detector

I now have both my car detection and my Key Holder up and running.

Now I am writting macros [Active Home Pro and the CM15A] and coming up with things to change about the automation, or change the way they automate, based on occupancy.
 
saw this via lifehacker: http://goo.gl/khA1a a little dorky. if you wire your rj45 connector properly, you can have a contact closure when the it's inserted into the jack
 
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