PIR sensors (PIRs) use heat radiation from bodies to identify the presence of people and animals. This can be used for unlocking doors or starting a video recording.

Yes. Most smart home motion sensors use PIR, or passive infrared technology, that detects nearby infrared light, letting them detect people and objects.

Lutron expands its Caséta Smart Lighting system with a motion sensor and a range-extending signal repeater The new gadgets announced at CES also work with Lutron’s Serena smart shades.

Michelin developed a smart lighting system for cyclists using proximity sensors and light sensors, making them more visible to motorists.

Philips Hue’s new wired indoor/outdoor security camera comes in black or white and can work as a motion sensor for Hue’s smart lighting and its new Hue Secure security system.