Last year, I took a look at some mostly low-cost passive infrared (PIR) motion ... sensor uses a “microwave Doppler radar” technique to detect moving objects. It has a sensitivity range of ~7 meters.

As an example, [Circuit Valley] has an IKEA Vallhorn motion sensor for a teardown ... but another mystery 8-pin chip is more elusive. The part number suggests an Analog Devices op-amp for signal ...

The springs are what determine whether a particular sound sets the sensor in motion. The researchers see many potential applications for their battery-free, sound-powered sensor. It could be used ...

It is the springs that determine whether or not a particular sound source sets the sensor in motion. Potential use cases for these battery- free sensors include earthquake or building monitoring.

Most measure ments/detections can be carried out using pre-wired add-on modules integrated with suitable sensors/transducers. Unfortunately, real-motion detection requires rather more sophisticated ...

It can act like a smart motion ... sensor can listen for intruders. If someone enters a room when no one is supposed to be home, you can have Alexa send an alert to your phone, play a sound ...

One of the most common first sensors people buy for their home is a motion sensor. But in almost all ... and while that may sound small, it’s not. Most sensors still use continuous power ...

Motion detection seems to be the most reliable sensor, but only until it stops working altogether and the Spotter needs to be reset. Sound detection worked, but I could never quite figure out how ...

Writing about it makes it sound complicated, but in reality, automating the Outdoor Motion Sensor's behavior takes just a few minutes once you know just what you want it to control. If you don't ...

It is the springs that determine whether or not a particular sound source sets the sensor in motion. Potential use cases for these battery-free sensors include earthquake or building monitoring. They ...