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Recommended Leak Detector
(lemmy.world)
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
I see quite a few on eBay. I would ask the seller if it has an ESP Wi-Fi chip to be sure it can be flashed