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USB C mm wave "radars" that hook to home automation are a thing. Priced between 11 and 20 bucks they are fairly feature rich... If you want to roll your own c

USB C mm wave "radars" that hook to home automation are a thing. Priced between 11 and 20 bucks they are fairly feature rich... If you want to roll your own check out what the folks over at ESP home have going on (google esp home mm wave).

stavros 2y ago
The actual component costs about $5, if you want to roll your own with an ESP32.