ishabana:
Your list is exactly right..this is the chain of process I am trying to reach.Again, this is an art project. I know and I actually know how to do this as a web app. But the decision here is purely aesthetic and not very logical. Yet, the idea is the standalone Arduinos should work on their own and can be installed anywhere. It is a kind of an "internet of things" approach.
Are you saying that you want to replace the "PC" that you mentioned in your Orginal Post (that I quoted in Reply #7) with something small and cheap?
If so that is certainly not what the text in your Original Post conveyed.
Maybe it is time to describe what you want to make without making guesses about what components would be suitable. What is this art project?
...R