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Nixie!

Take ten same-sized thin sheets of acrylic plexiglas.

In each one, carve a single digit, from 0 to 9.

Attach a bright LED to each sheet, so that it only lights up the one sheet.

Layer all the sheets so that you have a ten-deep sandwich of sheets.

Wire up the LEDs to some controller, so that you can have it light any one of the ten sheets, as it wants.

You should get something like this:

Nixie display

This is called a Nixie Display, or a Nixie Tube, after the old vacuum tubes that displayed numbers by lighting up one number's wire at a time.

Comments

revar
May. 2nd, 2004 03:07 am (UTC)
Put six Nixie displays together with a controller circuit and you have a clock. Or a count down timer. :)