Get close enough to this raven and you’ll set off the PIR sensor, which triggers lighting ... and of course, thunder. The light comes from a whopping 10-watt, 12-volt power LED.

PIR sensors are used for applications such as automatically turning on lights when someone enters a room or causing a video camera to begin operating. This passive method is not as reliable as ...

a passive infrared sensor (PIR) sensor coupled with a Zigbee interface. Inside the ultrasonic welded case is a small PCB and a Fresnel lens on the inside of the top cover, and a small PCB for the ...