Bob Blick wrote:
> 3 * 1.5 = 4.5 volts. Adequate for one-off "hobby" projects at 20MHz.

I know it's a hobby project but I'm doing it with the aspiration of 
actually making a marketable product, which is why I'm sticking to the 
limits of spec sheets and so forth.

If I need 4 AA batteries, I'll use 4 AA batteries.

> It
> will be close to 5 volts with fresh batteries and you'll have to see how
> low you can go. A good reason to read the page on the brownout detect in
> the PIC(leave it off for now).
>   

What does "brownout detect" do? Does it shut down the uC if the supply 
voltage drops below a certain threshold?

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