Or you could just use a low-voltage 5v solution and run wiring for that. 5v can be run in-ground without a conduit. You just have to buy the proper wire. That seems a lot easier and more reliable than trying to hack a switchmate.
If you're unfamiliar, this is the wire I'm talking about. Since it can just be directly buried in the ground, it makes it fairly simple to run power to just about anywhere close to your house. Combine that with a waterproof enclosure and a Hubduino setup and you're in business.
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