I am scanning the Internet resources and searching for ideas, parts etc. First elements have been shipped, some even delivered. Why it takes so long? The big companies give away free samples of their chips. Good for experiments! Perhaps I should think more about budgeting... :o) I am still not sure what kind of MCU to choose. I decided to build informational web site about the project. It will be useful for discussion with other robot enthusiasts. As I move deeper there is more and more questions.