After more user testing it turns out that the blink at the end of a cycle disrupts how the light is perceived. The word 'jarring' came up many times. So I changed it to a smooth fade, and it seems like people like it better!

The new boards from OSH Park came in and I've finally soldered them up. Since these new chips are the low voltage ATTINYs they should be able to get a longer run time on the same batteries. I've also added debugging outputs to the chip so that I can change some code if I really have to. It beats desoldering the ATTINY85s just to reprogram.

I figured out a nice way to hook the end is to use a craft earring and bend it into a looped shape.

I did some mechanical stress testing on some of the my older versions and I found that if I dropped it many times from chest level the battery pad has a tendency to come off. To fix this I have weakened the holders so that they don't push against the battery as hard.