>-----Original Message-----
>From: Wouter van Ooijen [mailto:wouter@VOTI.NL]
>Sent: 24 May 2004 08:54
>To: PICLIST@MITVMA.MIT.EDU
>Subject: Re: [PIC:] Single Row of LED's Illusion - How they do that?
>
>
>> If you settle for 8 LEDs, you could build one from say a 16F628 with
>> almost no support circuitry, and use a 5 or so line PICBasic program
>> to drive it.
>
>Why is everyone so 16F628-minded? The 16F628A is cheaper, the
>16F630 is much cheaper and still has 9 I/O (+2 when clocked
>internally, + 1 input when reset internally). Even the 8-pin
>12F629 can drive 12 LEDs! (for instance
>http://www.voti.nl/kitt-1/n_index.html).

That method wouldn't really work in this instance where you need an
arbitrary number of LED's turned on.

One thing that I don't understand: In the mechanicaly scanned displays,
either rotary or oscillating, the display data can synchronised to the
position of the display to ensure a stable and repeatable image.  With one
of these static displays that you are suppose to catch from the corner of
your eye, the likelyhood of catching the display just as it starts
displaying the first letter seems remote.  Suerly the vast majority of times
that the display is viewed, the message will be incomplete?

Regards

Mike




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