first of all,

I'm only making a static display board, at the moment...
and I'm having trouble getting my programmer plugged in, (just kidding)
(but not by much)


I'm not planning on whipping led dots at lightspeed,

but I love it!!!

very, very interesting ideas gents...

I, however, have a box full of latches, all with different little letters on
them.

I have found two xx164's and two xx595's

is the 595 different, or the main difference that it can be powered on and
off,
or however you might put it, set a bit pattern, then turn it all off the
turn it
back on with this same pattern???

thanks



----- Original Message -----
From: "Peter L. Peres" <plp@ACTCOM.CO.IL>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Monday, August 20, 2001 12:57 PM
Subject: Re: [EE]: LED Matrix : there's got to be a cheaper way?


> Cheap & good don't go together on this afaik. One of the less advertised
> ways to do it is to use a byte wide bus inexpensive mcu with a piece of
> RAM. By using clever address decoding the actual display is done by
> mapping bytes off of the data bus into a latch that drives one side of a
> matrix, the other side being driven by a shift register + buffers (or not)
> that shifts a '1' or a '0' driven by the same chip select logic. The shift
> register uses very few interface pins (two or one). The CPU is made to
> read a large table or something like that. It also communicates by serial
> bus with other CPUs.

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