At 08:26 AM 4/18/2004 -0400, you wrote:
>All,
>I'm hoping to find a simpler solution to what I thought would be a
>simple task of driving a single green/red bicolor LED from a PIC.
>Reversing polarity isn't easy!  I have found an old article that uses a
>relay or suggests a better solution of using a couple of transistors and
>resistors.  Sorry for such a basic question.  I searched the archives
>and only found a matrix solution.
>Thank you!
>- Chris

There are a couple methods shown in this short little article on page98
(written by some hack).

http://www.reed-electronics.com/ednmag/contents/images/112201di.pdf

Alternately, you can use one resistor and two port pins to reverse
voltage, which is simpler (but uses two port pins).

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

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