Dear makers! 
We are excited to share a tutorial on how to build a complex home automation system using Raspberry Pi and Arduino Mega boards powered by OpenHAB software. You can find a detailed step-by-step tutorial on our website, along with Arduino sketches, at this link: Pi-Home - How To | OpenTUX.
This tutorial provides an open-source alternative to commercial home automation systems.
Here is the overall scheme of the setup:
To see a UI demonstration of the OpenHAB, check out this video:
PiHome Demo | OpenHAB | Raspberry Pi | Arduino | DIY Home automation - YouTube.
We appreciate any feedback you may have!
Thank you!