As the title says, there seems to be a new kind of mmWave sensor from Tuya. It is very small and runs on two AAA cells. It says 10 GHz radar. The sensor comes in multiple 'flavors," some for native Tuya and others specifically for zigbee2mqtt. None of them sells for over $10, some for as low as $6.
Here is one of the many links to Aliexpress https://www.aliexpress.us/item/3256810463183333.html
Has anyone had any experience with these? These cost less than buying parts and DIY.
I actually have about 5 or 6 of these around the house on my slzb-06.
I’ll tell you this - they super are not mmWave. False advertising. They’re effectively a super cheap, pretty consistent motion sensor with temp/humidity.
Generally speaking, I haven’t had a single issue with them outside of the lack of true mmwave. I didn’t expect much though for that price, so was I disappointed? Well actually yes, kind of but meh.
So they are just PIR, not mmWave? So that is how they can sell for $7.