The sensor will react instantaneously to body heat and bring on a light outside your home whenever anyone approaches.

Passive infrared sensors react to changes in heat, such as the pattern created by a moving person.

Sentient computing is a form of ubiquitous computing which uses sensors to perceive its environment and react accordingly.

"No, probably because of the oversized filters; I kept thinking I smelled it the last day or so, but the sensors didn't react."

Turner had forgotten for the moment that the ship's sensors reacted to every use of wizardry on the entire planet.

The sensor cannot react to sudden changes in moisture, i.e., the reaction on the windings' surfaces takes some time to stabilize.

The sensors may react differently to different colors because lighter shades reflect more light.

When in contact with volatile compounds, the sensors react, which means they experience a change of electrical properties.

But the sensors hadn't reacted to what attacked her on the way down, and they'd been real enough.

"The sensors react to gravity and air pressure," Fletcher broke in quickly.