A smart home is more than a smart house.
Aqara makes the best smart sensors, hands down, and almost all of them, including hubs, are on deep discount right now. Amanda Blum is a freelancer who writes about smart home technology, gardening, ...
IKEA's 21 new smart IoT devices support Matter, HomeKit, Google, and Alexa, so you can build a low-cost setup with quick pairing and simple controls.
When smart home devices were first introduced, motion sensors were among the most interesting. This sensor would use differences in light to detect activity in a given space—impressive, but imprecise.