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I was wondering if someone has done something similar:
(social.graves.cl)
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
Not sure if I can offer any solution to this, but I would think through how you'll deal with eliminating false positives like when you're intentionally cooking something. You might include a PIR sensor to detect whether someone is actually standing at the stove and not send out warnings if movement is detected. Otherwise you'll get a bunch of notifications about the burners whenever you're cooking.