RCWL-0516 is a Doppler-Radar sensor, specialized in the detection of moving objects. Other than a PIR sensor does this micro wave motion sensor not require an infrared source, like a living object (human or animal).
This module is very sensitive, and works in a detecting range of up to 7m.
The wide supply voltage range of 4-28V DC makes it easy to use for various kinds of detecting needs.
Typical use is the detection of life to activate lighting or alarm.
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