Microwave Sensors

Unlike PIR, the microwave sensors are active elements. This means that in order to determine whether there is movement in the observed area, it sends a very high-frequency signal to the ether. The electromagnetic wave is reflected from various elements and partly returns to the sensor. If in the "field of view" of the detector there is a moving object, the return signal will be distorted, the frequency will change, the shift in the phase of the transmitted wave will change (if you do not know what it means, do not worry, code yourself that the signal will be different) .

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