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Don't forget Temperature Sensors for your Fridge!
(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
Water sensor near your washing machine.
And a smart speaker connected to HA in the bedroom to play a alarm once the smoke detector goes off.
I’ve yet to experience a smoke detector quiet enough that I couldn’t hear it throughout my entire house