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A 15cm Interactive Binary Ruler with Seven Logic Gates, Four Flip Flops and a Four Bit Binary Counter.
A 15cm Interactive Binary Ruler with Seven Logic Gates, Four Flip Flops and a Four Bit Binary Counter.
1,124 backers pledged AU$ 38,163 to help bring this project to life.
Andreas Hein, Sean Townsend, and 20 more people like this update.


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    1. Mike Kasprzak on

      @bradley DigiRule 2 suggestions:

      - AWG "Gauge" ratings on those drilled holes. I recently realized I had no tool for checking the gauge of wires, and marking it on the ruler would be great.
      - Alternatively, if there is a bunch of surface area left, if you google "AWG gauge tool", you should find this disc thing with measurements along the edge. I really like how this has the larger circle you feet your wire in to, and the thin gap you slide it in, and that's how you check the gauge.
      - I do wish the delay on rapid button pushes was lower. I can click that counter button quite rapidly, and it's a bit unfortunate.
      - I wish the buttons were a little larger. I don't know if there's a surface mount push-button with a larger surface area, but I know a little more surface area would be better IMO. The clicking action is fine, just I have big hands, and these are small buttons.

      Also, I'm not sure how flat/low profile an LCD you can buy. I also like how this accidentally turned in to a "learn how to program a PIC microcontroller" project for some of us. Being able to upgrade the firmware is a feature IMO.

      If a future ruler had a low-profile LCD with a couple rows of text, and a small matrix of buttons, maybe even a matrix of LEDs, maybe a slightly beefier microcontroller, then as we think of other useful tools, we could just upgrade the ruler software.

      Anyway, that's my 2 cents. :)

    2. Aselwyn1

      Too bad cr2023 choice was not done originally as I have quite a few lieing around.

    3. Bradley Slattery 7-time creator on

      I have thought a little bit about a possible DigiRule 2. Any idea's on what features you guys would like to have on such a ruler?

    4. Missing avatar

      sgllama on

      FWIW I don't think that I've ever seen - in 50-cough years - a dual-scale ruler that wasn't arranged the way the DigiRule is; after reading @Jaap Scherphuis comment I also Googled and the only images that I found which differed were not photos of real rulers but drawings/diagrams (and it is much simpler to create a drawing with the "wrong" arrangement). Of course, your Google-fu may be stronger than mine and no doubt such oddities do exist, but I'd find it very uncomfortable to try to use a ruler arranged any other way.

    5. Mike Kasprzak on

      @Freddi Oh wow. 30cm. Yeah, I wouldn't be able to resist that either.

    6. Missing avatar

      Freddi on

      I am still satisfied with the 5 I got (4 of them became christmas presents), so I won't be ordering one from the second batch. However I am pretty sure I will get weak when you ever come up with a 30cm version ... not that I need it, I just wanna have it lying around on my desk :-)

    7. Jaap Scherphuis on

      @rha: The rulers I'm familiar with all do it like this, so that you can use either scale in exactly the same way by turning the ruler around. I think almost all double-scaled rulers used to be like this 30 years ago (but not tape measures obviously). However, from a quick look at a Google image search, it seems that nowadays this kind is only in a slight majority, at a guess about 60:40.

    8. Missing avatar

      rha on

      The improved design looks well. I plan to order some, but I have to ask:
      What with the metric scale being upside down? Will the corrected version be available? Or the version with metric scale at top and inches at bottom of the rule?