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Project Notes

#428 3x7/LRThreeDigitDemo

Driving the Boldport 3x7 display from a Cuttle (Arduino) and the LRThreeDigits library.


Here’s a quick demo..



LuckResistor published the LRThreeDigits library for driving the Boldport 3x7 with an Arduino or compatible.

The LRThreeDigitDemo.ino sketch is just a quick test drive of the library.

Using the Library

The main things to note is that the library:

  • uses Timer2 for display refresh
  • mandates the pin connections per the following table
Arduino Pin Project Pin
Pin 2 Digit 1 Sink
Pin 3 Digit 2 Sink
Pin 4 Digit 3 Sink
Pin 5 Segment g
Pin 6 Segment f
Pin 7 Segment e
Pin 8 Segment d
Pin 9 Segment c
Pin 10 Segment b
Pin 11 Segment a





Credits and References

Project Source on GitHub Project Gallery Return to the LEAP Catalog

This page is a web-friendly rendering of my project notes shared in the LEAP GitHub repository.

LEAP is just my personal collection of projects. Two main themes have emerged in recent years, sometimes combined:

  • electronics - usually involving an Arduino or other microprocessor in one way or another. Some are full-blown projects, while many are trivial breadboard experiments, intended to learn and explore something interesting
  • scale modelling - I caught the bug after deciding to build a Harrier during covid to demonstrate an electronic jet engine simulation. Let the fun begin..
To be honest, I haven't quite figured out if these two interests belong in the same GitHub repo or not. But for now - they are all here!

Projects are often inspired by things found wild on the net, or ideas from the many great electronics and scale modelling podcasts and YouTube channels. Feel free to borrow liberally, and if you spot any issues do let me know (or send a PR!). See the individual projects for credits where due.