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Recommendations for robot vacuum cleaners
(feddit.uk)
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
Anything well supported by Valetudo, they have a nice list. I bought a Roborock S5 for $35 on ebay that needed the gearbox for the brush cleaned out, and it works well.
The d10s pro/plus are great and not terribly expensive. The breakout board isnt too hard to build either. If youre afraid/bad at soldering i saw a few prebuilt on ebay