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Google won't bring new Nest Thermostats to Europe
(www.engadget.com)
This is a most excellent place for technology news and articles.
I built a thermostat with a Wemos D1 mini and a relay module about 10 years ago.
Still use it today integrated with home assistant and can turn the heat on and off while away from home. It's been reused across three boilers, no parts replaced.
It was a really fun project and I had virtually no experience with Arduino when starting out. Would recommend it to anyone.