At 03:39 PM 6/26/2004 -0700, you wrote:
> > Then just use an 8 pin PIC to drive the LEDs.  The LEDs are matrixed onto 4
> > or 5 pins.  Talk to it serially via the input-only pin (GPIO3).  Its a tiny
> > footprint and probably much cheaper than the alternatives.
> >
> > dwayne
>
>Ah yes, off course, great idea! And I could add PWM & blinking support and
>everything in software. But how do I connect those 2-pins bicolor LEDs to
>the pins? I tried to figure it out, but unfortunately, I didn't succeed...


You need 5 and 5 resistors (one in series with each port pin).
Connect each LED back-to-back pair across one unique pair of pins after
the series resistor, of which there are 10, so you have two spare.

Only one LED can actually be on at once, but by multiplexing you can have
more than one apparently on.

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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