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.

If you want to reduce your energy use, motion sensors can turn lights off when a room is empty. For someone caring for elderly parents, a motion sensor by their bed can send an alert when they get ...

Amazon Echo’s built-in ultrasonic motion sensing can let you easily automate lights and fans with Alexa routines, without buying anything else.