Afordable Home Automation

[Riaanhar]

As electricians did any of you worked on home automation systems?
What was your experience with these systems?
What was your likes / dislikes of these systems?

I had been working in the home automation industry for some time now, But I found all the systems available are overly priced and not providing me what I would like if I install it in my own house.I have been working on a system and I think I close to a workable solution.

I am planing to use conventional electrical wiring and a decentralized system. 1 controller controlling 1 or 2 rooms(arias) which include relay switching /
AC dimming / led dimming / sensor readings / light and temp reading/ IR control for av equipment and all controllable from keypads or PC Tablet and most smartphones.(The system is optically isolated from relays ext.)Also planing voice recognition and rf tag reader addons.

I want a simple wiring system that electricians understand to make installations quicker and easier.I found most of the other centralized automation system
confuses a lot of electricians especially when installing for the first time.I prefer hardwiring to wireless solutions but might implement limited solutions later.

I want to control relays wired in place or with a conventional switch to control the load.This will be just a 12V DC source triggering the relay or contractor.
Using the same controller I can also run dimmers ac or LED(12 led bulbs or strips).

Do any of you know if I can run cable for 12v dc with the ac cabling in the same condute ?
What can I do to make the product trustworthy = ie SABS certification (are there other organizations doing similar test?)

I would appreciate any thoughts and suggestions or Information

Thanks