It seems that in an effort to “go green,” some hotels have installed motion-sensor thermostats. This makes sense during the day when we are out, but it poses a problem at night.

Some motion sensors are based on optical measurement technologies to provide accurate velocity and position measurements without requiring physical contact with the object or surface being monitored.

If your iPhone's sensors aren't working correctly, you may need to calibrate them. Here's how to calibrate an iPhone's brightness and motion sensors.

Motion detectors are already an incredibly clever means of adding functionality to a room, but these uses will help you stay safe, save money and more.

This weather-ready outdoor sensor from Philips Hue tracks motion, temperature and ambient light. It can trigger your lights and gadgets accordingly.