Here's a simple timer we made to control the strobes. There's room for 3 more circuits in the box, but for now, we're just using it for the one.

Basically, it has 2 timers (One for timing the pauses between pulses, and the other for timing the length of the pulse. There are dials to adjust both, so this is much more practical than the 555 IC circuit I was planning on building. Power out from this box, will have to be routed out of the garage window along with the NOMA cords. Note NOMA light bar to the left of timer.

Box all closed up. We wired indicator lights and manual buttons on the front of this for testing purposes.