HLK-LD2450 Motion Target Detection and Tracking Module
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Product Information
Specifications
- Product Name: HLK-LD2450
- Manufacturer: Shenzhen Hi-Link Electronic Co., Ltd.
- Technology: 24GHz millimeter wave radar sensor
- Features: Motion target detection and tracking
- Output: Serial data
- Dimensions: Refer to the user manual for detailed
dimensions
Product Usage Instructions
1. Installation
Follow the provided dimensions for pin or socket interface
installation. Ensure the power supply is connected correctly.
2. Configuration
Connect the module to your system using the serial port for data
output. Configure the settings based on your specific application
requirements.
3. Integration
Integrate the module into your smart scenarios or end products.
Ensure proper placement for effective motion detection and
tracking.
Frequently Asked Questions (FAQ)
Q: What type of radar sensor technology does the LD2450 module
use?
A: The LD2450 module uses 24GHz millimeter wave radar sensor
technology for motion detection.
Q: How can I connect the module to my system?
A: You can connect the module via the provided serial port for
data output. Refer to the user manual for pin definitions.
Q: What are the advantages of using millimeter wave radar
technology?
A: Millimeter wave radar technology offers good environmental
adaptability, high detection accuracy, and can penetrate materials,
providing a reliable solution for motion sensing applications.
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Shenzhen Hi-Link Electronic Co., Ltd.
HLK-LD2450
Motion target detection and tracking module
Instruction manual
Version: V1.00
Modify date: 2023-5- 10
Copyright @Shenzhen Hi-Link Electronic Co.,Ltd
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HLK-LD2450 Shenzhen Hi-Link Electronic Co.,Ltd
CONTENTS
Instruction manual
1 Product overview …………………………………………………………………………………….4 2 Product features and advantages ……………………………………………………………. 5
2.1 Characteristics …………………………………………………………………………….. 5 2.2 Solution advantages ………………………………………………………………………5 3 Application scenarios ………………………………………………………………………………7 4 Hardware description …………………………………………………………………………….. 8 4.1 Dimension ………………………………………………………………………………………8 5 Use and configuration ……………………………………………………………………………10 5.1 Typical application circuits ……………………………………………………………. 10 5.2 Description of the visualization upper computer ………………………………. 10 6 Communication protocols …………………………………………………………………….. 12 7 Installation method and detection range ………………………………………………..14 7.1 Installation instructions …………………………………………………………………. 15 8 Performance and electrical parameters ………………………………………………… 17 9 Antenna cover design guide ………………………………………………………………….. 18 9.1 Effect of antenna cover on millimeter wave sensor performance …………18 9.2 Antenna cover design principles …………………………………………………….. 18 9.3 Common materials ……………………………………………………………………….. 20 10 Revision record ……………………………………………………………………………………21 11 Technical support and contact information ………………………………………….22
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INDEX OF CHARTS
Instruction manual
Table 1 Pin definition table ………………………………………………………………………………. 9 Table 2 Format of reported data frames ……………………………………………………………. 12 Table 3 Format of data within the frame …………………………………………………………… 12 Table 4 Table of performance and electrical parameters …………………………………….. 17 Table 5 Common material properties of antenna covers ………………………………………20 Figure 1 Effect of the upper computer function demonstration……………………………….4 Figure 2 Comparison of millimeter wave radar solutions and other solutions……………..6 Figure 3 Module size diagram…………………………………………………………………………… 8 Figure 4 Module pin definition diagram………………………………………………………………9 Figure 5 Diagram of wall mounting…………………………………………………………………..14 Figure 6 Radar wall mounting angle identification…………………………………………….. 14 Figure 7 Schematic diagram of the tracking range when the radar is wall mounted (wall height 1.5 m)……………………………………………………………………………………………. 14
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HLK-LD2450 Shenzhen Hi-Link Electronic Co.,Ltd
1 Product overview
Instruction manual
Motion target tracking is to track the position of the moving target in the region in real time, and realize the distance, angle and speed measurement of the moving target in the region.The LD2450 is a motion target tracking sensor module from the Hilink 24G millimetre wave radar series, which includes extremely simplified 24 GHz radar sensor hardware and intelligent algorithm firmware. The solution is mainly used in general indoor scenarios such as homes, offices and hotels to enable the location tracking of moving human bodies.
The sensor hardware consists of an AloT millimetre wave radar chip, a high performance one-transmitter-two-receiver microstrip antenna and a low cost MCU and peripheral auxiliary circuitry. The intelligent algorithm firmware uses FMCW waveforms and the radar chip’s proprietary advanced signal processing technology.
It supports serial output of detection data, which is plug-and-play and can be
flexibly applied to different smart scenarios and end products.
Figure 1 Effect of the upper computer function demonstration
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2 Product features and advantages
Instruction manual
2.1 Characteristics
24 GHz ISM band Integrated intelligent millimeter wave radar chip and intelligent algorithm firmware Precise motion target localization and tracking Longest detection range 6m Ultra-small module size: 15mm x 44mm Wall mounting Azimuth angle ±60°, pitch angle ±35° The ultimate cost-effective choice Multiple connection options with pin and socket interface
2.2 Solution advantages
LD2450 human body sensing module adopts 24GHz millimeter wave radar sensor technology, compared with other programs, has obvious advantages in human body sensing applications:
1. In addition to sensitive sensing of the movement of the human body, for the traditional program can not identify the micro-movement of the human body can also be sensitive to sense;
2. Good environmental adaptability, the induction effect is not affected by the surrounding environment such as temperature, brightness, humidity and light fluctuations;
3. Good shell penetration, can be hidden inside the shell work, no need to open holes in the product surface, improve the product aesthetics;
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Instruction manual
Infrared Solutions
Visual Solutions
Ultrasonic
Application Flexibility
Resistant to environmental influences (weather, light, etc.)
Detection speed
Detection Accuracy
Resolution
Directionality
Detection distance
Penetrating material capability
Size
Cost
Laser Radar
Millimeter wave radar
Good
Normal
Weak
Figure 2 Comparison between millimeter wave radar solution and other solutions
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3 Application scenarios
Instruction manual
The LD2450 motion target tracking sensor can accurately locate and track targets and is widely used in various AloT scenarios, covering the following types: Smart Home Sensing the distance and angle of the human body, reporting the detection results for the main control module to intelligently control the operation of air conditioners, fans and other home appliances. Smart Business Position sensing, within the set position interval to identify the human body approaching or moving away, timely lighting or closing the screen. Bathroom Smart toilet accurately controls the automatic opening and closing of the toilet lid. Smart Lighting Identify and sense the human body, precise position detection, can be used in home lighting devices (sensor lamps, desk lamps, etc.).
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4 Hardware description
4.1 Dimension
Instruction manual
Figure 3 Module size diagram
The module provides two kinds of external interfaces, socket and pin, both of which have a serial port and a power supply port, so users can choose to use either of them as needed. The dimensions of the pin interface are shown below:
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HLK-LD2450 Shenzhen Hi-Link Electronic Co.,Ltd
Socket interface dimensions are shown below:
Instruction manual
4.2 Pin definition
Pin 5V GND Tx Rx
Figure 4 Module pin definition diagram
Function Power supply input 5V Power Ground Serial port Tx pins Serial port Rx pins
Table 1 Pin definition table
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5 Use and configuration
Instruction manual
5.1 Typical application circuits
LD2450 module directly through the serial port in accordance with the prescribed protocol for the output of the detection results data, the serial output data contains up to three targets position and speed and other information, the user can be used flexibly according to the specific application scenarios.
The module power supply voltage 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 3.3 V. The default baud rate of the serial port is 256000, with 1 stop bit and no parity bit.
5.2 Description of the visualization upper computer
We provide LD2450’s visualization upper computer demonstration software, which is convenient for users to experience the radar module’s positioning and tracking effect on the target. How to use the upper computer:
1. Use USB to serial tool to connect the module serial port correctly, module pin description please check Table 1 pin definition table;
2. Open the ICLM_MTT.exe host tool software, click the detect device button, the host software automatically search the LD2450 module through the serial port;
3. After detecting the module, the host software will have the following prompt.
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Instruction manual
4. Then click the Start button, the host software will receive the detection data reported by the LD2450 module and display it on the software surface in real time.
The display includes real-time positions of up to three targets on a sector map, distance, angle and speed information for each target.
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6 Communication protocols
Instruction manual
The LD2450 module communicates with the outside world through a serial port with a default baud rate of 256000, 1 stop bit, and no parity bits.
The radar outputs information about the detected target, including x-coordinates in the area, y-coordinates, and the velocity value of the target. The data format reported by the radar is shown in the table below and is reported at 10 frames per second.
Frame header
Intra-frame data
End of frame
AA FF 03 00
Goal 1 information Goal 2 information Goal 3 information
55 CC
Table 2 Format of reported data frames
The specific information contained in the individual targets is shown in the table below:
Target X coordinate
Target y coordinate
Target speed
Distance Resolution
signed int16 type,
highest
bit
1
corresponds to positive
coordinates,
0
corresponds to negative
coordinates, unit is mm
signed int16 type,
the highest bit 1
corresponds
to
positive coordinates,
0 corresponds to
negative
coordinates, the unit
is mm
signed int16 type, the highest bit 1 corresponds to the positive speed, 0 corresponds to the negative speed, and the other 15 bits correspond to the speed, the unit is cm/s
uint16 type, the size of a single distance gate, the unit is mm
Table 3 Format of data within the frame
Example data: AA FF 03 00 0E 03 B1 86 10 00 40 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 55 CC
This set of data indicates that the radar is currently tracking a target i.e. target 1 (blue field in the example), target 2 and target 3 (corresponding to the red and black fields in the example, respectively) do not exist, so their corresponding data fields are
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Instruction manual
0x00. The process of converting the data of target 1 into relevant information is
demonstrated as follows:
Objective 1 x-coordinate: 0x0E + 0x03 * 256 = 782
0 – 782 = -782 mm
Objective 1 y-coordinate: 0xB1 + 0x86 * 256 = 34481
34481 – 2^15 = 1713 mm
Goal 1 speed0x10 + 0x00 * 256 = 16
0 -16 =-16 cm/s
Target 1 distance resolution: 0x40 +0x01* 256 = 360 mm
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7 Installation method and detection range
Instruction manual
The typical installation method of LD2450 is wall mounting, as shown in Figure 5, the farthest positioning tracking distance is 6m. wall mounting needs to consider the application scenario of shading and top interference, the recommended installation height range is 1.5~2m.
Figure 5 Diagram of wall mounting
Figure 6 Radar wall mounting angle identification Figure 7 Schematic diagram of the tracking range when the radar is wall mounted (wall height 1.5 m)
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Instruction manual
Figure 7 shows the localization tracking range of this module at a wall height of
1.5 m. The test person was 1.75 m tall and of medium build. The detection angle range
is ±60° centered normal to the radar antenna plane.
7.1 Installation instructions
Confirm minimum mounting clearance
If the radar needs to install the housing, the housing must have good wave transmission characteristics at 24 GHz and cannot contain metallic materials or materials that have a shielding effect on electromagnetic waves. Installation environment requirements This product needs to be installed in a suitable environment, the detection effect will be affected if used in the following environments: The presence of continuous movement of non-human objects in the sensing area,
such as animals, continuously swinging curtains, large green plants facing the air outlet, etc. There is a large area of strong reflective objects in the sensing area, strong reflective objects will cause interference to the radar antenna When hanging wall installation, need to consider the indoor top of the air conditioning, electric fan and other external interference factors Precautions for installation Try to ensure that the radar antenna is facing the area to be detected, and the antenna is open and unobstructed around Make sure the installation position of the sensor is firm and stable, the shaking of the radar itself will affect the detection effect To ensure that the back of the radar will not have object movement or vibration. Due to the penetrating nature of radar waves, the back flap of the antenna signal may detect the moving objects on the back of the radar. A metal shield or metal back plate can be used to shield the radar back flap to reduce the effect of objects on the back of the radar
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Instruction manual
When multiple 24 GHz band radars are present, do not install them in the direction
directly opposite to the beam, but as far away as possible to avoid possible mutual
interference.
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8 Performance and electrical parameters
Instruction manual
Operating frequency band Power supply requirements Average operating
current Modulation method
Interface
Target application
Detection distance Detection angle Data refresh rate
Sweep bandwidth
Ambient temperature Dimension
24GHz~ 24.25GHz Comply with FCC, CE, Commission-
free certification standards
DC 5V, power supply capacity >200mA
120 mA
FMCW
One UART Detection and tracking of up to three
targets 6m
±60 °
10Hz 250MHz Compliant with FCC, CE, Commissionfree certification standards -40 ~ 85
15mm x 44 mm
Table 4 Table of performance and electrical parameters
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9 Antenna cover design guide
Instruction manual
9.1 Effect of antenna cover on millimeter wave sensor performance
Radar waves are reflected on the radome boundary 1. The total power radiated or received by the radar is lost 2. The reflected wave enters the receiving channel, affecting the isolation between
the transmitting and receiving channels 3. The reflection may make the antenna’s standing wave worse, further affecting the
antenna gain Radar wave propagation in the medium will occur loss, theoretically the higher the
frequency loss will be greater The electromagnetic wave will be refracted to a certain degree when passing
through the medium 1. Affect the radiation direction map of the antenna, which in turn affects the
coverage of the sensor
9.2 Antenna cover design principles
Structural shape of the antenna cover Smooth and flat surface, uniform thickness.Such as flat or spherical surface, not
uneven If there is surface coating, it cannot contain metal or conductive material
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Instruction manual
Above the antenna, the antenna surface is parallel to the antenna surface
The height of the antenna to the inner surface of the radome H The ideal height is an integer multiple of the half-wavelength of electromagnetic
waves in the air
,where m is a positive integer, co is the vacuum speed of light, f is the
working center frequency.
For example,24.125GHz center frequency,its half-wavelenath in the air is about
6.2mm
The thickness of the antenna cover D The ideal thickness is an integer multiple of the half-wavelengthof the
electromagnetic wave in the medium
,where m is a positive integer, is the relative dielectric constant
of the radome material
For example, an ABS material = 2.5, its half wavelength of about 3.92mm
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9.3 Common materials
Instruction manual
Before design, understand the material
and electrical characteristics of the
radome
The table on the right is for reference
only, Please confirm the actual value
with the supplier
The height of the antenna to the inner
surface of the radome H
When space allows, 1 or 1.5 times
Table 5 Common material properties of antenna covers
Wavelength is recommended.
For example, 12.4 or 18.6mm is recommended for 24.125GHz
Error control: ±1.2mm
The thickness of antenna cover D
Recommended half wavelength, error control ±20%
If the thickness requirement of half wavelength cannot be met
Low material is recommended
Thickness recommended 1/8 wavelength or thinner The effect of inhomogeneous materials or multi-layer combination of materials on
radar performance is recommended for experimental adjustment during design
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10 Revision record
Instruction manual
Date 2023-5-10
Version 1.00
Modified content Initial Version
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Instruction manual
11 Technical support and contact information
Shenzhen Hi-Link Electronic Co.,Ltd
Address: 1705, 17/F, Building E, XingheWORLD, Minle Community, Minzhi Street, Longhua District, Shenzhen
Tel0755-23152658/83575155
Email: sales@hlktech.com
Website: https://www.hlktech.net/
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Documents / Resources
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Hi-Link HLK-LD2450 Motion Target Detection and Tracking Module [pdf] Instruction Manual HLK-LD2450 Motion Target Detection and Tracking Module, HLK-LD2450, Motion Target Detection and Tracking Module, Target Detection and Tracking Module, Detection and Tracking Module, Tracking Module |