this post was submitted on 29 Jul 2023
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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
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https://xtremeownage.com/2022/06/29/433mhz-fridge-freezer-monitoring/
433 mhz sensors work nicely. If, my fridge/freezer / other freezer gets too hot, I get push messages.
Backup wan connection and a LOT of battery runtime ensures I will know.