Whats wrong with my sprinkler system?
Zip-tie a plastic bag around one of the sprinkler heads. If it’s full of water in the morning, you know the sprinklers went off. (If it’s a large bag, you can even figure out roughly how long they ran.) “When” is tougher…You could probably cannibalize one of those “flooded basement” detectors, run wires back to your bedroom, and get an alarm when the water starts. It wouldn’t be too hard to hack something like that up from scratch, either. Perhaps you could use the signal to turn on a clock, which you’d set at 12:00 before going to bed. Then you’d be able to work backwards to figure out what time the sprinklers started.
