Datasheet

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7.4. Power
Radar modules require higher quality power supplies than conventional low
frequency circuits. When supplying power to the module, the power supply
must be free of threshold burr or ripple and effectively shielded from power
supply noise caused by accessory equipment.
The radar module needs to be well grounded, as ground noise from other
circuits can also cause degraded performance or even abnormal operation
of the radar module; most commonly resulting in closer detection distances
or an increased false alarm rate.
In order to ensure the normal operation of the module's internal VCO
circuitry, the power supply to this module requires a +5V to +6V supply with
a voltage ripple of
≤100mV.
The external power supply must provide sufficient current output capability
and transient response.
8. FAQ
Interference factors: Radar is an electromagnetic wave detection sensor and
moving inanimate objects can lead to false alarms. Movement of metals,
liquids, can lead to false positives. Often, electric fans, pets close to the
radar and the swaying of metal curtains can cause false alarms. Radar needs
to be planned at the angle of installation.
Non-interference factors: Radar electromagnetic waves can penetrate
human clothing, curtains, thin wooden panels, glass. Depending on the
application, the installation angle and performance of the radar needs to be
determined.