Depending on your system, you probably have a sensor attached to your roof. The sensor knows it's dry right now, so the sprinklers will come on. Some of the newer systems (Hunter and otherwise) have ground sensors, but you have to be very careful with them -- they break easily because they're very close to the surface and, if you do new landscaping, odds are the wires will get cut and no more sensors.
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Army/embassy brat - traveled too much to mention
Moved here from SF Bay Area (East Bay)
"There are only two ways to live your life: One is as though nothing is a miracle; the other is as though everything is a miracle." Albert Einstein
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