While PIR sensors can be used with Arduino and other microcontroller boards, those best-suited for hobby use are smart enough to perform simple tasks without any programming.

The iPhone utilizes a sophisticated set of sensors for many of its operations, from automatically adjusting screen brightness based on the light around you, to detecting motion for various apps ...

They don’t work with sensors, or things that report a status. (Accessories often have sensors associated with them, like a light or motion sensor on a camera.) ...

Motion zones are an easy way to customize how your live-streaming security camera detects activity. Ring security cameras and doorbells let you create three detection zones for free.

HomeKit motion sensors are a vital accessory when building a smart home than runs by itself without manually turning devices on and off.

There's really not much to the motion sensor. The sensor shoots out an invisible light field that spans 100 degrees horizontally and 100 degrees vertically. Its blind spot is 180-degrees to its sides.