On Feb 22, 8:05*am, Harlan wrote:

Well a customer (business) would like [take-a-number display] where the
employee can
increase or decrease the displayed value (max of two digits) with the
push of an
up or down button . A clear or reset button would also be helpful.

Another feature desired would be to "light up" another indicator,

Also it would be desirable to have a smaller LED display at the
operator's desk

These systems are available pre-built, of course. For the displays,
just buy a big bag of LEDs and connect series to make seven-segment
displays of any size you want (it's relatively easy to find drivers
for such
things). For the 'other indicator' just pull more LEDs from the big
bag.
Prebuilt displays aren't anything more complex than that, just molded
into a plastic block.

And if a desk doesn't have easy view of the main display, consider the
truck-mirror-addon convex mirrors at the local auto-parts store; hang
a few
in appropriate locations, and anyone's desk can have line-of-sight to
the
big numbers (though, mirror-reversed).

If you want to get elaborate, you could put a CCTV camera on the main
display and plop a few repeater screens around the office (or even in
the
restrooms and other places patrons might wander).