A motion sensor activates the light when it detects something moving within its field of view. Photocells work with a resistor that changes its conductivity based on how many photons are hitting it.

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.

It is very easy to use and trivial to splice into the roost of a little project idea. RCWL-0516 . This sensor module has been designed as an alternative to the common PIR motion sensors widely used in ...

My Initial tests (using the regulated 5VDC power supply) found it works well enough for my needs. In my quick estimation, the Grove-mini PIR motion sensor module (v1.0) is a compact and cost effective ...

This motion sensor is tied to a stay-on switch for the kitchen. So, when I take out the trash, the kitchen lights do not turn off abruptly just because I have left the room for more than a minute.

In some motion control applications detecting position can be more appropriately handled with a switch than a sensor no matter how easy the sensor is to use. Newer limit switches, such as Honeywell's ...