When it came time to start the programming for my time circuit displays, I needed a library of characters for segmented LED displays so that I could not only show the time, but also display strings of text. Maybe I wasn’t looking hard enough or I was looking in the wrong place, but much to my dismay I couldn’t find a readily-accessible library to use. So I’ve made my own and I want to share it so others don’t run into this same problem.

LED Segment ASCII Library

The library is hosted on GitHub and has symbols for 16-segment, 14-segment, and 7-segment LED displays. All visible ASCII characters are covered (32 – 127 inclusive). Both binary and hexadecimal literals are included depending on your application, as well as images of the characters and a display segment legend.

You can find the library here: LED Segment ASCII Library.

All of the character patterns and the associated symbol literals are released under the widely permissive MIT license, while the images are released under Creative Commons – Attribution. You can find the full texts of each license in the repository as well.

If you find a problem or have a suggestion to improve one of the characters, please create an issue on the GitHub repository. Otherwise, enjoy!


GK · August 16, 2017 at 1:41 pm

Thanks for sharing the library and great job as always! I was looking to model my project after yours and was wondering if you would mind sharing the PCB files on Github also or through e-mail? Thanks.

    Dave · August 17, 2017 at 9:23 am

    Thanks GK! I’m going to keep the PCB design files for the time circuits close for the time being. I still haven’t decided if I want to make them available.

      GK · August 17, 2017 at 4:00 pm

      I certainly can can respect that. I know how much time and effort it takes to build this project. Like you, I’m trying to build mine right and I appreciate all the great info so far!

zebulon 1er · May 6, 2020 at 5:09 am

This is a so wonderful idea, that I posted it on Diaspora* (https://diasp.org/posts/a4b0ea9069ac01389f4a047d7b62795e). You’ll see that your library inspired me a lot… 😀
Note : Animations are in APNG format (Animated PNG). So, use a web browser that supports this format.

    Dave · May 6, 2020 at 6:34 am

    Those look great! Thanks for sharing!

      zebulon 1er · May 15, 2020 at 12:41 pm

      Hello again,

      I wrote a very little bash script that convert given sentences and/or text file paths to a SVG1.1 file with a 16-segment LCD design.
      If Inkscape (< v1.0) is present, it will create too a PNG file from the SVG created by the script.
      Really inspired by your own big project. ;P


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