This is a miniature Motion Detector, unlike PIR ones these work on more like a Radar principle, so they are more sensitive, can operate hidden behind plastic panels, and have a longer sensing distance.
Using such a sensor is pretty simple, supply 4 to 12v on the Vcc pin, Ground on the –GND Pin, and then the Out pin will go high at 3.3v when motion is detected.
Maximum sensing distance 7-12 meters
High Signal Output is 3.3v (this will be fine for both 3.3v and 5v arduinos to read as high)
Low Signal Output is 0v
Supply Voltage is 3.3 to 15v
Supply Current is just 4mA
When motion is detected the output pin goes high (3.3v) for 5 to 6 seconds.
The inked video from Big Clive is worth watching if you want to know how these things function.
Here are a couple more links for you…
Experiments with the RCWL-0516 (a slightly bigger module, but principle is the same)
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