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.

This circuit is from the GLOLAB web page. The document referenced here includes an excellent design as well as an excellent tutorial on PIR devices. You've probably seen these devices in homes and ...

CAMBRIDGE, UK — The IRS-B210ST01-R1 pyroelectric infrared (PIR) sensor is what manufacturer Murata claims to be the world's smallest at just 5.0×4.7×2.4mm, enabling the sensor to be used in compact, ...

Hoofddorp, Netherlands: The latest version of Murata's pyroelectric infrared (PIR) sensor is claimed by the company to be the world's smallest at 5.0 x 4.7 x 2.4 mm, enabling the sensor to be used in ...