[ladyada] has a freshly-published and amazingly thorough tutorial on passive infrared (PIR) motion sensors. Most often seen in security floodlights and automatic doors, in creative hands these sensors ...

This file type includes high resolution graphics and schematics when applicable. Bluetooth technology and standards are opening the door for engineers to use portable smartphones and tablets to make ...

PORTLAND, Ore. — Sensor manufacturers have continued to improve the sensitivity of their designs through engineering innovations derived from trial-and-error ...