Common motion detectors include passive infrared (PIR) and active ultrasonic and microwave. Less common types of motion detectors also include tripwires and video surveillance cameras. Passive ...
Ultrasonic proximity sensors use reflected or transmitted ultrasonic waves to detect the presence or absence of a target component. The output is boolean, that is, the sensor merely detects whether ...
[Circuit Valley] has an IKEA Vallhorn motion sensor for a teardown, it’s as you might expect, a passive infrared sensor (PIR) sensor coupled with a Zigbee interface. Inside the ultrasonic welded ...
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