Hi-Link HLK-LD2420 Manuel de l'utilisateur - Page 15
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Imprimer la pagePrecautions for installation
Try to ensure that the radar antenna is facing the area to be detected, and the antenna is open
and unobstructed around.
To ensure that the sensor installation position is solid and stable, the radar itself shaking will
affect the detection effect.
It is ensured that there are no objects moving or vibrating on the back side of the radar. Due
to the penetrating nature of radar waves, the antenna back flap may detect moving objects at the back
of the radar. A metal shield or a metal back plate can be used to shield the radar backside flap to
reduce the effect of objects on the backside of the radar.
When multiple 24 GHz band radars are present, do not install them in direct beam alignment,
but as far away from each other as possible to avoid possible mutual interference.
Power Supply Notes
The power supply input voltage range is 3.0 V~3.6 V, and the power supply ripple has no
obvious spectral peaks within 100 kHz, this solution is a reference design, users need to consider the
corresponding ESD and lightning surge and other EMC design.
8. Cautions
Maximum detection distance
The maximum range of the radar is 8 m. Within the range, the radar reports the straight-line
distance of the target from the radar. The radar can only output distance information for moving
bodies within 8 m. It does not support proximity ranging for stationary bodies at this time.
Maximum distance and accuracy
Theoretically, the radar range accuracy of this reference solution is 0.35 m. Due to the different
body size, status and RCS of human targets, the range accuracy may fluctuate, and the maximum
detection distance may also fluctuate.
Target disappearance delay time
When the radar module detects no human presence in the target area, it does not immediately
report the "unoccupied" status of the area, but delays it.
The delayed reporting mechanism is: once no human target is detected within the test range, the
radar module will start a timer, the duration of which is the unoccupied duration, and if no one is
detected within the timer, the "unoccupied" status will be reported at the end of the timer; if someone
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