The cheapest visual solution is one very cheap LED.  Like the old engine
indicators:

Blink the number of times for the first digit (1/4 second on, 3/4 second
off)
Pause for 2 seconds
Blink the number of times for the second digit (1/4 second on, 3/4
second off)
Pause for 5 seconds

Takes 25 seconds max to read the two digits off the display, but costs
less than a few cents, and only needs one line.

I bet there's even a way to do it with zero dedicated lines.

-Adam

Drew Vassallo wrote:

> I want to display just 2 numbers out of the PIC somehow.  Doesn't matter
> how, just the simplest, easiest, cheapest solution.  Could be an LED
> display, LCD, smoke signals, it doesn't matter.
>
> I'd like to use a 12C67x series 8-pin PIC, though, so I only have 3
> lines to
> use maximum.  If it's not possible in this case, I would have to move
> to a
> larger chip, but it's not preferred to do this.
>
> I have a 2-wire LCD interface already working, but I'd like to make it
> simpler/cheaper if possible.
>
> Any suggestions?
>
> --Andrew
>
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