Window sensors are a critical part of any home security system. Learn how they work so you can ensure this last line of defense is there when you need it.

The chip drives the LEDs, light reflects off smoke particles, and enters the optical sensor. From there, magic algorithms turn this into a number corresponding to a particle count.

Just as blood absorbs green light, it also reflects red light, so every 10 minutes the Apple Watch’s infrared LEDs kick on to measure heart rate.

It's found its way onto aircrafts, spaceships, and might even be in your pocket right now. So, what is LiDAR, how does it work, and what new knowledge and capabilities has it given us?

Phase Detection Autofocus is a key technology in modern smartphone cameras. Here's how PDAF works and everything else you need to know.

Here's the run-down on back-side illuminated sensors (like those in the recently announced Sony cameras) including how they differ from more conventional designs and why we're still waiting for an ...

Many of your smartphone's coolest feats are accomplished with a wide range of sensors—but what are they and what do they all actually do?

Your vehicle's MAP sensor plays a crucial role in keeping it performing at its best. Here's how it works and the warning signs that it might be failing.

Short answer: There’s a drivetrain on it! We go over the battery, sensors, and other components that make your electric bicycle go.

Your vehicle's MAP sensor plays a crucial role in keeping it performing at its best. Here's how it works and the warning signs that it might be failing.