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Human Presence Detection Radar

HLK-LD1125H-24G

Application Manual

V1.2

2021-9-16

Due to product upgrades or other reasons, the content of this

document will be updated from time to time. This document is

intended as a guide only, and neither the information nor the

recommendations stated shall constitute any express or implied

warranty.

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Summary of Contents for HLK-LD1125H-24G

Page 1: ...V1 2 2021 9 16 Due to product upgrades or other reasons the content of this document will be updated from time to time This document is intended as a guide only and neither the information nor the recommendations stated shall constitute any express or implied warranty ...

Page 2: ...1 Content 1 Overview 2 2 Module appearance and interface 3 3 Module performance 4 4 Debug wiring 4 5 Debug configuration 5 6 Radar installation and testing 12 7 Precautions 14 8 Appendix 15 ...

Page 3: ...dule is to judge the existence of the human body by detecting the accumulated human breathing and other small scale movements Therefore the detection of human presence is more accurate than traditional mobile detection radars Not easy to miss Indoor human presence detection Human body slight moving induction Modules can penetrate non metallic enclosures without openings Common materials include pl...

Page 4: ...rance and Interface Pin interface definition 2mmpitchpinheaderconnectorisrecommendedfortheinterface Pin Name Remark 1 VCC Power supply 5V power supply 2 GND Touchdown 3 URX TTL serial port receive 4 UTX TTL serial transmission ...

Page 5: ...itate 8m exercise Serial ASCII output 3 Module Performance Scope Hanging height 3m static human detection coverage radius 2m Power supply电 3 3 5V Current 80mA Output serial 3 3V Detection cycle 4 Debug wiring HLK LD1125H 24G uses the serial port to output the test results in string format so in the testing you can do a quick test evaluation on the serial port assistant firstly adaptive ...

Page 6: ...ted to serial board RX 5 Debug configuration The HLK LD1125H 24G can be debugged and tested on the computer through the serial port assistant Use any serial debugging tool The baud rate is 115200 8 data bits 1 stop bit check bit and flow control are None select ASCII for receive settings and select ASCII for send settings Product supports UART text protocol 1 baud rate 115200 2 word width 8bit 3 s...

Page 7: ...ts to rmax 6 mth1 Set the segmentation sensitivity threshold of 1 mth1 corresponds to the signal threshold within 2 8 meters The default value is 60 mth2 Set the segmentation sensitivity threshold of 2 mth2 corresponds to the signal threshold within 2 8 8 meters The default value is 30 mth3 Set the segmentation sensitivity threshold of 3 mth3 corresponds to the signal threshold beyond 8 meters The...

Page 8: ...n instruction demonstration Take the serial port assistant window as an example to demonstrate the function and output of each command Send rmax 8 the module will feedback received message rmax 8 rmax is 8 00 Indicates that the command configuration is successful If you do not receive this feedback please check whether the sending command has a carriage return and line feed and resend the command ...

Page 9: ...ether the sending command has a carriage return and line feed and resend the command Send get_all the module will feedback received message get_all And return all parameter settings of the current module If you do not receive this feedback please check whether the sending command has a carriage return and line feed and resend the command You can use this command to check whether the parameter sett...

Page 10: ...due to the small room or other surrounding electromagnetic factors At this time you need to set the corresponding mth value by entering test_mode and observing the size of dis and str when no one is present For example if after entering test_mode there are no people in the room but the module keeps outputting mov or occ dis is within 2 meters and str is within 80 According to the default mth1 60 t...

Page 11: ...do some upper layer delay processing after receiving the serial port signal output by the module 1 After connecting the module click serial port detection serial port selection open serial port the display interface will display the distance value and status Someone s here status corresponds to the module serial port mov output The displayed distance is the output value of the module serial port d...

Page 12: ...lays that someone is still For example if it is set to 6 it means that when the host computer needs to receive occ 6 times continuously it will display that someone is still 3 Enter an integer 1 in the switch unmanned window and the host computer will enter the system when it does not receive any data within the set time into an unmanned state The window value unit is seconds For example if it is ...

Page 13: ...e after setting otherwise it will fail when power off corresponding to the save command 6 Radar installation and testing Test application scenario 1 Horizontal installation straight line test The installation height is 1 meter and the human body is facing the radar when measuring Test coverage in both sitting and walking states Reference coverage The figure below shows the radar coverage when it d...

Page 14: ...This module can also be hung up for human presence detection Our test scenario is a hanging height of 3 meters to measure the FOV of the human body standing still and walking The blue area is the mobile sensing area The orange area is the static presence sensing area ...

Page 15: ...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 t...

Page 16: ...15 Appendix Module test environment display an empty room with a length of 18 meters and a width of 10 meters Hanging height installation ...

Page 17: ...15 ...

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