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wifi Temperature gauges?
(lemmy.ml)
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 have Shelby flood sensors in the basement, based on WiFi. They were cheap and the batteries last over a year. While they do have an online portal, the HA integration can read them locally. One of the things I get from it is a graph of temperatures, however the data points can be an hour or more apart.