Microwave 2 click is an accurate and reliable short to medium range motion detection Click board™, based on a Doppler radar principle.
The Doppler effect (or the Doppler shift) is the change in frequency or wavelength of a wave in relation to an observer who is moving relative to the wave source. It is named after the Austrian physicist Christian Doppler, who described the phenomenon in 1842. A common example of Doppler shift is the change of pitch heard when a vehicle sounding a horn approach and recedes from an observer. Compared to the emitted frequency, the received frequency is higher during the approach, identical at the instant of passing by, and lower during the recession.
This phenomenon is used on a Doppler radar, which radiates waves in the microwave frequency band and picks them up, as they get bounced off the object. The object movement causes the aforementioned Doppler shift in the frequency of the reflected waves. By comparing them with the radiated waves frequency and amplifying this difference, the object movement direction and speed can be easily determined. And this is how Microwave 2 click works, too: it is a small Doppler radar, intelligent enough to eliminate unwanted noises and random object movement interferences.
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