I like your solution Dwayne, but it doesn't meet my requirements (it
might meet Lawrence's though. I would like to drive the bi colour LED
and a switch using only three wires. Your solution would take all three
for the LED. I do like it though...I might want to put monitoring LEDs
on the main board, and this might work out well. The question now
becomes one of finding 3 pin LEDs I like :)

Josh
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>
> Does it have to be a dual LED?  How about 2 separate LEDs?  If you can get
> away with separate LEDs, how about
>
>       pic pin------------+
>                    A K   |   A K
>     5V---res1--+---LED---+---LED---+---res2--GND
>                |                   |
>                +-------res3--------+
>
> The LEDs are in series.  Res1 determines LED brightness of left hand LED
> when PIC pin is LO.  Res2 etermines brightness of right hand LED when PIC
> pin is HI.  Res3 keeps the voltage across the LEDs low enough so that they
> don't light when PIC pin is tri-stated.
>
> This is similar to the mid-point drive solution posted earlier but consumes
> MUCH less quiescent current.
>
> dwayne

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