It's not anything particularly impressive in the automatic Christmas light control category, but this is what I put up for the holidays.It isn't much more than an Arduino and the TRIAC switch box out of my lamp control system . The TRIACs are hung under the eves, with bell wire run into the garage where I have the Arduino board on an outlet timer. It appears that the system is missing pull-down resistors on the TRIACs, since one of the channels leaks when the Arduino shuts down, glowing very dimly all day. It never ended up being a problem, but since my TRIAC circuit is clearly wrong, I won't post it.