Connect two 330 ohms in series; the other ends of each go to +5 and ground.
Connect your bi-colour between the common point of the resistors and your
PIC output.

You might need to tweak the values to get uniform intensity on both colours.

Regards,

Anand Dhuru

----- Original Message -----
From: "Matt Redmond" <mdredmond@CHARTER.NET>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Thursday, April 22, 2004 3:34 AM
Subject: [EE]: Drive bicolor LED w/ one output pin


> Hi All,
>
> My basic EE skills are lacking so I was hoping someone might suggest a
solution to this...
>
> I have a bicolor LED - one of the 2-lead types where the green anode is
the red cathode and vice-versa.  You reverse polarity to change colors.
>
> What I need to do is drive this with one output pin on my PIC.  I swear
I'd do it with two if I had them, but I don't.
>
> The green can be on all the time except when the red comes on.  So -
steady green and then red when my output goes high (or low).
>
> Any thoughts?
>
> Thanks!
>
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