I had some fun working with this 5 x 7 LED matrix on July 1 and I was able to prove out some concepts I read about in posts about similar projects. Basically, using "Persistence of Vision" I was able to animate fireworks lighting just one LED at a time in order to limit current drain on the BS2. This project is the simplest possible for hardware because you need just a microcontroller, a LED matrix and some resistors. The programming becomes more complex because you can use only one LED at a time. With more "buffer" circuitry it would be possible to light more LEDs. This is a good example of a project that is documented so that it can be reproduced by high school students.
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