Making large numeric displays

JP Hindin jplist at kiwigeek.com
Wed Oct 4 13:16:58 CDT 2006


Perhaps this might give you some ideas:

http://www.sparkfun.com/commerce/present.php?p=GPSClock-1


On Wed, 4 Oct 2006, Jules Richardson wrote:
> I got to wondering how to make a large numeric display (a few inches high) for
> a potential project. I've only seen 7-segment displays up to about an inch in
> height, plus I quite fancy something with more rounded numerals anyway (all of
> this came about from thinking about Nixies :)
>
> Building something from individual LEDs looks to be cost-prohibitive, not to
> mention power-hungry; I think I figured on over about 125 LEDs per digit.
>
> I came up with something based on 23 segments which I think will look nice.
> Basically a 14-segment grid like the following:
>
>     _ _
>    |   |
>    |_ _|
>    |   |
>    |_ _|
>
> ... then with each square part containing a circle split into four segments.
> Finally a central segment runs top to bottom to give a '1' digit centered
> horizontally.  (I'm not going to try and draw arcs in ASCII ;)
>
> I need to do some tests to see how well light from an LED will travel through
> perspex (plexiglass, or whatever the preferred term is) if I mount the LED at
> one end of a strip, box off three sides with metal foil, and (maybe) polish
> the exposed side. In theory I can easily shape that to give the arcs that I
> need, too.
>
> Of course all of this is just a precursor to see if anyone else has built big
> displays like this as part of a project, and what they found worked well (or
> otherwise)
>
> It may be that I can get away with having the curved sections live 'inside'
> the boxes (i.e. it won't be noticeable from a distance anyway), so that there
> are no points of overlap; time will tell there.
>
> Heck of a lot easier driving 23 LEDs per display rather than five times that
> amount, anyway! If it's technically possible, the issue will be how long it
> actually takes to make each digit and get it right, though. Ideas are welcome...
>
> cheers
>
> Jules
>
> --
> A. Because it destroys the natural flow of conversation.
> Q. What's wrong with top posting ?
>
>
>




More information about the cctalk mailing list