Actually, I was at an Atmel seminar, where they had an example application that used this exact scheme yesterday.

I'll do 4*4-1 ascii art up some time today.


----- Original Message -----
From: William Chops Westfield <westfw@MAC.COM>
Date: Thursday, June 10, 2004 5:28 pm
Subject: N*(N-1) LEDs on N pins

> On Saturday, Nov 1, 2003, at 01:03 US/Pacific, Wouter van Ooijen
> wrote:
> > You do know that with 5 I/O's available you could handle 20 LEDs?
>
> (also in microchips "tricks and tips" document, but without much
> explanation...)
>
> So, this is just a semi-conventional multiplexed LED arrays with (for
> example) the anodes connected to the N-1 pins and the cathodes for
> thatN-1 LEDs connected to the Nth pin, right?  Because of the extra
> connections, you can only drive one anode bit and one cathode bit (one
> LED) at a time...
>
> Thanks
> Bill W

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