Homeowner Forum / Home Automation / August 2007

With two power flashes and a form "C" sensor, using the same method as you already know only extending it, you can have one X10
signal for Door Open and another for Door Close.  You don't really need a relay as long as the sensor's contacts are rated for the
whatever current the opener's input uses.

You might want to consider adding a second safety photo sensor, a few inches higher than your car's rear bumper to prevent
accidentally closing it onto your trunk if you're not meticulous about pulling the car all the way in each time (been there,
scratched that).

Actually, we had to design a more reliable means of opening a gate
controller (than X-10) and wound up using the 4204 relay module for an
Ademco Vista series panel (Vista 50).  Not only will the four button
keyfob open the gate it also allows him to turn on certain exterior
lights and open his garage door.  We installed custom graphic LED
annunciator panels in four locations in the house that display open
doors and windows as well as the status of the dead bolt locks on all
the exterior doors and the status of the main gate and garage doors
(whether they're "open" or "closed").  The system's been up and running
for five years.  I've only recently sent him the specs on the Elk
M1-Gold.  I figure he's a "prime candidate" for an upgrade.  :-)