As can be seen from the dates between postings, I took an awful lot of time with this project – and yet, I never really accomplished my goal, which was to have five LEDs independently fading in and out like a candle, driven by an Atmel ATTiny13.
I spent a lot of time with some code [...]

If you’ve visited my web site on backyard railroad illumination, you know about my fixation with creating light that flickers as though it were a fire (either from candle or a fireplace).
The first solution to that problem was to modify LED tea candles — readily available at crafts stores and even Walgreens — so that [...]