However, when smoke passes through the detector, it bends the light rays so that some hit the light sensor and trigger the alarm.

Motion sensors are triggered by light changes. As people cross a room, the light shifts, and a motion sensor is triggered; as long as people are moving enough, a motion sensor works fine. But ...

The Motion Sensor requires a Philips Hue Bridge to work, so it's best if you already have an established smart lighting setup ...

The sensor features a single relay contact that can be wired to alert a control system, trigger an alarm, or close a valve to halt the flow of liquid. It has easy to read green/red “traffic light” ...

Aqara has now launched its official 2025 Prime Day sale, delivering some of the best prices of the year and some historical ...

Use it facing a window to sense when your curtains should open or close. Set an indoor light sensor to trigger doors to close, lock, and various other daytime tools to shut down.

The YoLink Water Leak Sensor 4 is the best smart water-leak detector we tested, due to its quick response time, effective alarm, and easy setup.

Besides a flashing light alarm, you can also create automations that trigger light scenes when a Hue sensor detects activity.

Can home security motion detectors detect cockroaches and other pests? Yes. Most smart home motion sensors use PIR, or passive infrared technology, that detects nearby infrared light, letting them ...

This article compares three types of photoelectric sensors—through-beam, retroreflective and diffused—used in industrial applications to detect object presence.

CES 2025: Aqara’s Newest ‘Presence Sensor’ Keeps the Lights on Better Than a Motion Detector A presence sensor uses wave radar technology to sweep a room, looking for the slightest movement.