At 03:39 PM 6/24/2004 -0700, you wrote:
>Hi,
>
>I'm in the process of drawing up the schematics of my next project, a
>preamp. I'd like to be able to see the selected input on the front panel
>and decided to use Multimec switches (http://www.mec.dk/billeder/8_619.jpg).
>
>Because the preamp will have a tape loop output, I need to be able to see
>that as well on the front panel. I think bi-color leds (the ones with 2
>pins, not those with 3, since they won't fit the switches) are the best
>for that.
>
>The problem is that I can't figure out how to connect those 8 bi-color
>leds to a shift register. Is it possible to connect 8 bi-color leds to an
>8-bit shift register and control all of them? I need to be able to turn
>them all on independently, but there never won't be more than 1 green & 1
>red lighted (in case I use red/green bi-color ones of course). Is there
>any kind of matrix-style connection possible for this or do I have to
>resort to a 16-bit shift register? Note the fact that I need to light 1
>green & 1 red led at the same time, so usual matrix arangements won't work.

Why don't you just use 5 PIC 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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