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On Thu, 19 Jun 2008 18:01:05 +0100, "Toms  hilidhe" <toe@lavabit.c om>
said:
>
> Imagine a tri-colour LED. It has 3 pins: two anodes and a common
cathode.
>
> Now lets say we wanted to control this with a PIC chip, and we only
need
> two colours. Easy, we just tie the cathode to ground and then take two
> pins from the PIC chip, putting one pin to each LED anode.
>
> When we want both LED's off, we just put both pins low.
> When we want it green, we put Pin 1 high and Pin 2 low.
> When we want it red, we put Pin 1 low and Pin 2 high.
>
> OK, easy stuff. What I'm trying to do though is use one sole PIC pin
to
> achieve this. The PIC pin's three states would correspond to:
>
> Pin High = Green
> Pin Low = Red
> Pin as Input = Neither

Attached are picture with 2 approaches for this: 
1. transistor based,
2. comparator based

This maybe an overkill, but looks like a fun thing to do!

Sergey

http://beaglerobotics.com


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