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Precautions - Hi-Link HLK-LD1125H-24G Applications Manual

Human presence detection radar

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Precautions

When the radar is working, there should be no metal or other medium that hinders the
transmission of electromagnetic waves in front of the antenna;
Different housing materials and the distance between the module and the inner surface of
the housing will result in different spectral energy returned and parameter settings, which
need to be fine-tuned according to actual conditions. It is generally recommended that the
module be 5-6mm away from the housing, which can be adjusted according to the actual
measurement.。
We recommend users to test according to the default settings of the module. If the effect
is not as expected, you can send the shell structure to the original factory, and the original
factory will test and adjust a reference setting.
The module is for human movement and presence detection, so the distance value given
is not accurate distance measurement, but only indicates the approximate distance of the
target.
If the person under test sits quietly with his back to the radar, the sensing effect will
decrease. The rise and fall of the chest or abdomen caused by breathing cannot be
detected when the back is facing the radar.
It is recommended to use plastic as the casing, because the radar is a very sensitive
module in the presence of the human body. If the casing is made of a material with large
attenuation, it may affect the detection.
Install to avoid the air outlet of the air conditioner, fans and other objects.
Sensitivity is adjustable according to user scenarios. This manual gives the highest
sensitivity case. To adjust sensitivity, contact technical support
If you need more technical support, you can contact sales.
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