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Leak sensor prevented me from some pain!
(feddit.org)
Home Assistant is open source home automation that puts local control and privacy first. Powered by a worldwide community of tinkerers and DIY enthusiasts. Perfect to run on a Raspberry Pi or a local server. Available for free at home-assistant.io
It sucks when you have a leak sensor, estimate the likeliest place that water will appear, miss it by a few inches thanks to the way water goes where it wants, and you end up having to manually catch the leak.