> Is it actually possible to program a micro controller in such a way that 
> it does what you expect it to?

Ermmm, yeh, otherwise I'd doubt they'd sell many.

> It's an interesting idea, but it looks like the kind of thing where I'd 
> spend the rest of my life wondering why it doesn't do what I thought I 
> programmed it to do. (I.e., it looks impossible to debug.)

If you're thinking of making it from logic gates, it would seem like it 
would only be a very short program in any language.  Last time I used them 
was about 10 years ago and you had to do it in assembly.  But there was a 
simulator you could run your code on.  Nowadays I suspect they are far more 
sophisticated, I'm sure you can get a USB programmable one fairly cheaply, 
just google for "USB microcontroller".

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