dstig1: I've got both wires for "door down" sensors and wires for light beams on the garage doors. Garages are pretty easy retrofit areas, so I left that out. You should have a way to get the wires there though. Obed, add to you list a conduit and box to get to the inside area of the garage. I also have wires going to the openers that come down to the automation area, I think you can see them in another thread where I took some pix of the garage doors. I also have a framed hole in the mud room where I can put LEDs to show the up/down status of each door (so I don't have to open the door and look into the garage). Nothing makes me work harder than the ability to be lazy

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cyril: thanks. But I won't abuse that as a license to drone on (much) :laughing:.
Part of the drive I have for home automation is this: There are a ton of little independent solutions for stuff (like the Chamberlain system), but none of them talk to anything else. So you end up with a little system for the garage, the weather station is independent, the floor heat system is independent, security and lighting are independent, etc. If it's all tied together then you get nice stuff like "when you go to night mode, the system tells you if a garage door is let open". Other things like "when it gets dark out, the system tells you if a garage door is open" tie the light sensor and doors together.
There are tons of really cool things out there, but we have reached a critical mass where adding one more toy pushing things over the edge into a Tower of Babble scenario. We are exerting more energy to keep it all working than we are deriving benefit from it's use.
Tying this back to Obed's sensor question, if you can define what a generic sensor is then you can look for those solutions or make your own (like a microswitch with lever on the garage door, or a light beam at the top to know if the door is up). So inputs are contact closure, analog voltages (for temperatures), and a few serial ports for talking to weather stations, security systems, and a few other things (software not included, that's part of the "fun" at my end).
Pete