The presented schematic shows how to build a simple PIR motion sensor. PIR sensors allow motion sensing, it is almost always used to detect whether someone has moved in or out of the sensors range.

Recently, I exhausted my stock of common passive infrared (PIR) motion sensor modules and was looking for a new one to play with. I searched the web for a small type with self-contained electronics.

A dark hallway or an underlit staircase is a disaster waiting to happen, as the chances of stumbling and even falling increase during the night. In case you have underlit corners or places in your ...