Note I modified drawing below:
+ = resistor

Marcelo Yamamoto wrote:

> Jeff wrote:
> >First,    each LED is back to back with the other, such as:
> >|------------**------------|
> >|                          |
> >|        |-------**--------|
> >|        |                 |
> >|-------**--------|        |
> >|        |        |        |
> >|---**---|---**---|---**---|
> >+        +        +        +
> >O        O        O        O
>
> Pay attention to do not use high bright leds, as the current will flow thru
> the desired led and thru 3 other leds in series that will be in parallel
> with the first one.
>
> o--+----L---------+-----o
>       |---L--L--L---- |

As I mentioned my earlier post, I hadn't shown the resistors, but they
were there. Each pin has a resistor.... lets say 220ohms for a total
of 440ohms. So any LED that is powered across it will see about
2.2volts, or whatever its turnon voltage is.

Remember, a LED is still a diode, and the turnon knee is fairly
sharp. So, in "theory" the most any other LED will see will be
1.1 volts, so it shouldn't turn on. Of course, if you start mixing
technologies..... maybe a blue LED with a red led, since they
have varying turn-on voltages, you might have problems.

-Jeff