A Wonderful Home Service Robot - recommanded

Hi all,

We present a low-cost autonomous navigation home service robot:

I do not know how to embed a YouTube movie here and if you know please do me a favor. THX!

Above videos demonstrate what we have achieved. And I was wondering if someone can give us some suggestion or additional functionality recommendations to continue this project? THX~

That is really cool. Can you tell me how you build it and what you used for Micro controllers and electronics.