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Leash LIght
Saturday, October 16, 2021
I used the same program from the DreamCoat for this 12 pixel circular display, in fact the display comes from the DreamCoat which I thought had "too much".  I cut the program down quite a bit so it only contains a few lines.

I attached the display, Adafruit Trinket and battery holder onto a retractable leash body and use it at night when I walk the dog along the highway.

Video on YouTube
Arduino/C++ program here
The battery holder holds two CR2032 button cells, in series for output of 6 volts which the Trinket can tolerate.  A switch on the side is very handy for turning the light on and off.   I bought these from eBay or Amazon, my source for all these kinds of parts.