The thought of using a standard ethernet or wifi network for the automation signals is stuck in my mind, it would undoubtedly be much more work, for instance:
-A central control PC
-A wireless system controller, like the Nokia n800 in the post below.
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An Alix (maybe alix3c3) in every room where automation required, these are $140 AUD each, powered using a PoE switch.
-Inexpensive USB cameras, with audio, where required, mainly for motion detection.
-USB thermometer for rooms that need climate control.
USB powered controllable relays, such as this, have linux drivers and are fairly inexpensive, but there seems to be no way to interrogate the state of the relay. If you go to a microcontroller based relay controller the cost goes up and it can't be USB powered. Although you can steal DC power from the Alix, more investigation required. update: something like this may be the ticket.
-A PoE switch, of course, this Alloy one would do nicely.
This madness may pass...
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