5
use and configuration
5.1
Typical Application Circuit
The LD2410 module directly outputs the detected target state through an IO pin (someone
is high, no one is low), and it can also output the detection result data through the serial port
according to the specified protocol. The serial port output data includes: Target status and
distance auxiliary information, etc., users can use it flexibly according to specific application
scenarios.
The power supply voltage of the module is 5V, and the power supply capacity of the
input power supply is required to be greater than 200mA. The module IO output level is
3.3V. The default baud rate of the serial port is 256000, 1 stop bit, and no parity bit.
5.2
The role of configuration parameters
The user can modify the configuration parameters of the module through the serial
port of the LD2410 to adapt to different application requirements, and the configuration
content will not be lost when the power is turned off. The configurable parameters include
the following:
farthest detection distance
Set the farthest detectable distance, only human targets that appear within this farthest
distance will be detected and output the result. Set in units of distance gates, and each
distance gate is 0.75m. Including the farthest door for motion detection and the farthest
door for static detection, the setting range is 1~8. For example, if the farthest door is set to
2, only if there is a human body within 1.5m will it effectively detect and output the result.
Sensitivity
Only when the detected target energy value (range 0~100) is greater than the
sensitivity value will it be determined that the target exists, otherwise it will be ignored.
The sensitivity value can be set from 0 to 100. The sensitivity of each range gate can
be independently set, so that the detection in different distance ranges can be
precisely adjusted, local accurate detection or filtering of interference sources in
specific areas. In addition, if the sensitivity of a certain distance gate is set to 100, the
effect of not recognizing the target under the distance gate can be achieved. For
example, if the sensitivity of distance gate 3 and distance gate 4 is set to 20, and the
sensitivity of other distance gates is set to 100, it can only detect the human body
within the range of 2.25-3.75m from the distance module.
no-one duration
When the radar outputs the result from man to no man, it will report man for a period
of time. If there is no man in the radar test range during this time period, the radar will
report no man; if the radar detects man during this time period, it will be refreshed again.
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