Seven Segment Display Future Project

Fri, 7 Sep 2012

Here's a possible future project with some interesting challenges. This project really appeals to my inner geek, the part of me that loves to experiment with microprocessors and electronic components.

On the top of the box is a seven segment display, the type used in LCD calculator displays and petrol station price signs. (USA = Gas station) Turn the handle and the counter counts.

A worm gear will be used to step down the handle rotation so that ten full turns will be needed for the full count. Each segment of the display will be a hole in the card with a sliding shutter behind it. Move the shutter to one side to reveal the black, to the other side to reveal white. The seven segments can then be driven by a pack of cams in the box base driven via the worm gear.

To extend the project it would be great if several seven segment displays could be linked together so that they could count to 99, or 999 or even beyond!

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Comments (5)

  • Tony Terry September 7, 2012 at 10:40 pm

    Can you produce paper logic

    Can you produce paper logic gates? I once tried to work this out on paper, but gave up after doing about 2 segments. I can see why special look-up table chips are used in real life!

    There be Logic Goats here 🙂 – RI

  • Simon68 September 7, 2012 at 11:33 pm

    Can’t wait to see it done!

    Can't wait to see it done! very cool!

  • lunchweek September 8, 2012 at 12:52 am

    Oh my! This may be one of

    Oh my! This may be one of your best projects ever, Rob!

  • michaelj September 9, 2012 at 6:09 pm

    I have been looking for a

    I have been looking for a display like this for years! The only thing I can find of this size are electronic digits, well beyond my price range. I cannot wait to see the finished version. … A suggestion: If the handle were on the front, then several units could be set side-by-side to create multi-digit displays. I also think 10 turns of the handle is too many, perhaps two or three would be better.

  • lemariogo September 13, 2012 at 10:17 pm

    Hi Rob,
    Maybe you can get

    Hi Rob,

    Maybe you can get some inspiration for this idea with this LEGO version:
    Best regards,

    Wow, that’s fantastic! Thanks! – RI

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