I've recently come across a problem that I feel should be nearly trivial, but for the life of me I can't figure out how it would be done. Basically all I want is a series of LEDs that will light up like dominoes. Essentially just looking for some way of triggering the next LED really.
This would be a pretty trivial problem with an Arduino and a relatively small number of LEDs (as many LEDs as pins), but I'm really looking for a way to put together a few dozen of these. I would prefer a solution that works without a microcontroller, but if I can use one microcontroller for a semi-arbitrary number of LEDs I would be more than happy.
Answer
Cascaded 4017 decade counters, pulsed by a single 555 timer. Each pulse makes the 4017 light the next one in sequence, which is then passed onto the next 4017, etc. 
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