Thanks for your input. V. interesting, I’ll check out the Z-Wave sensors. I’m in UK btw.
I do not understand what you mean by microwave.
There’s some motion sensors e.g.
… that use microwave detection as well as / instead of infrared. Meant to be more reliable in some cases.
What do you mean by a “smart” sensor?
Good point, the same sensor I linked to above just has a normally-closed relay switch output for integration into other systems. Sometimes called a ‘zero-volt’ connection. I think this is common for many ‘commercial’ motion sensors. By smart, I was really thinking of some element of ethernet / wifi / zwave / zigbee comms talking to some kind of service / app somewhere. That might be e.g. HAB directly (good) / IFTTT (OK) / proprietary cloud (less good). Unfortunately the ‘smart’ sensors are nearly all battery - presumably the designers think that’s what non-commercial consumers want.