Hi-Link HLK-LD015-5G User manual

Shenzhen Hi-Link Electronic Co., Ltd.
HLK-LD015-5G Radar Module
User Manual
Version: V1.0 Date: Jun.6th.2020 All rights reserved © Shenzhen Hi-Link Electronic Co.Ltd

Contents
1. BRIEF INTRODUCTION ......................................................................................................................................1
2. MODULE PICTURE................................................................................................................................................1
3. INPUT AND OUTPUT INTERFACE..................................................................................................................... 2
4. MECHANICAL DIMENSIONS.............................................................................................................................. 2
5. ELECTRICAL PARAMETERS...............................................................................................................................3
6. SENSING TIME AND SENSING DISTANCE ADJUSTMENT...........................................................................3
7. PHOTOSENSITIVE DETECTION......................................................................................................................... 4
8. MODULE POWER-ON SEQUENCE DIAGRAM.................................................................................................4
9. SCHEMATIC DIAGRAM OF DETECTION RANGE...........................................................................................5
APPENDIX A DOCUMENT REVISION HISTORY..................................................................................................6

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HLK-LD015-5G
1. Brief Introduction
HLK-LD015-5G is a miniaturized 5.8G radar sensor launched by Hi-Link. The module size is
46*8mm. The module fully integrates 5.8G microwave circuit, intermediate frequency amplifier
circuit and signal processor, with high integration and good production consistency. The peripheral
is matched with a miniaturized planar antenna, which greatly reduces the overall size while
ensuring the performance of the sensor. The sensor can be used to detect the presence of human
body or various scenes of moving target sensing, including smart home, Internet of Things, and
smart lighting. Especially in the field of lighting, it has been widely used in standard lighting
products such as induction bulbs and tubes.
2. Module Picture
Figure 1. HLK-LD015-5G Radar Module physical picture
Input&Output interface
Planar antenna
Radar chip

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3. Input and Output Interface
The module reserves 5 pin holes with a PIN distance of 1.2mm. The three PINs VCC, GND
and OUT are used by default. If parameters such as distance and delay time need to be modified,
they can be flexibly configured through the serial port RX and TX. When there is no host computer,
RX and TX can also be used as I/O ports to adjust parameters. The following table shows the
definition of each PIN
4. Mechanical Dimensions
The figure 2 below is a schematic diagram of the module's size and pin position. The module
length and width are 46mm*8mm. There are no pins and the overall thickness is 2.5mm by default.
If you need pins, the default pin height is 12mm.
Unit: mm
Figure 2
Pin Name
Function
Remarks
VCC
Module Power Supply
The default LDO is not attached, VCC is 5V, and the version
with LDO attached, VCC is 7~12V, the default power consumption
of the module is 35mA, and the recommended power drive
capability is over 50mA
GND
Ground PIN
OUT
Output Signal
The default output 5V high and low level, can be modified to PWM
output as needed
TX
Serial port/burn tDio/IO
Can be used for software upgrade or performance parameter
RX
Serial port/burn tClk/IO
Can be used for software upgrade or performance parameter

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5. Electrical parameters
6. Sensing time and sensing distance adjustment
HLK-LD015-5G requires 3 pins by default, namely VCC, GND and OUT. At this time, the
induction delay and induction distance are fixed values. If you need to adjust the induction delay
and induction distance and other related parameters, you need to add 2 pins, RX and TX, on the
hardware as shown in Figure 3. In software configuration, RX and TX can be used as I/O ports or
UART ports to adjust module parameters. These two PINs are regarded as I/O ports by default,
where TX is used to adjust the sensing distance, its sensing distance is 4~6 meters at low level
while 3~5 meters at high level; RX is used to adjust the delay time, its sensing delay time is 30S at
low level while 2s at high level. When the sensing is triggered again within the delay time, the
timing will restart. RX and TX can also be used both as UART port to adjust the module parameters,
and serial ports.
Parameters
Minimum
Value
Typical
Value
Maximum
Value
Unit
Remarks
Transmit frequency
5725
5875
MHz
Transmit power
0.5
1
mW
Input voltage
4.5
5
5.5
V
LDO is not attached by
default
Output high level
5
V
Output low level
0
V
Working current
38
50
mA
Hanging height
3
5
M
Adjustable according
to specific needs
Sensing radius
4
6
M
Related to sensitivity
and hanging height
Delay time
30
S
Adjustable according
to specific needs
Photosensitive threshold
10
Lux
Adjustable according
to specific needs
Operating temperature
-30
85
°C

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Figure 3. PIN Foot of Parameter Adjustment
7. Photosensitive detection
The module supports photosensitive detection, but photosensitivity can be optional. If
photosensitive function is required, a photosensitive diode and regulation resistor can be added to
the position shown in Figure 4. The photosensitive detection function should also be enabled in the
software. The photosensitive threshold can be adjusted by the regulation resistor. In the version
with photosensitive function, the radar sensor will be activated only when the ambient light is lower
than the set illuminance. If the light is too bright, the module will not activate the sensor function.
When testing the radar performance separately, you can cover the photosensitivity with black tape
to avoid photosensitive effect, which affects the activation of the radar sensor function.
Figure 4. Photosensitive adjustment
8. Module power-on sequence diagram
The module has a power-on self-check function, that is, after the module is powered on, the
OUT pin first outputs a high level, and then outputs a low level after 1s delay. The low level enters
the normal induction mode after 1s delay. The following is the squence diagram of the control
signal after the module is powered on
Add Serial port
or I/O port
Photosensitive diode

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vcc
OUT 1 S 1 S Inductive OUT=1，No induction OUT=0
Figure 5. Module power-on sequence diagram
9. Schematic diagram of detection range
The sensing sensitivity of the radar sensor can be configured through the MCU, and its limit
sensing distance is 10 meters, and the actual sensing distance can be adjusted appropriately as
required. The following is a schematic diagram of the radar detection range under the condition of
hanging height. If the sensitivity is set higher, the detection range will increase accordingly. The
dark area in the figure is the high sensitivity area, which can be fully detected in the area, and the
light color area is the low sensitivity detection area, objects can be basically detected in this area.
Figure 6. Schematic diagram of HLK-LD015-5G detection range (unit: m)
Precautions
When installing, avoid metal shells or parts on the front of the antenna to avoid shielding the
signal. Plastic or glass is allowed, but the obstruction should not be close to the front of the

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antenna;
Try to avoid directing the radar antenna direction to large metal equipment or pipelines, etc.;
When installing multiple radar modules, try to ensure that the antennas of each radar module
are parallel to each other, avoid direct illumination between the antennas, and keep a distance of
more than 1m between the modules;
The radar sensor should be avoided facing the AC drive power supply, and try to stay away
from the rectifier bridge of the drive power supply to avoid power frequency interference with
radar signals;
The power supply driving capability of the radar module needs to be more than 50mA,
otherwise it will cause the sensor to work abnormally.
Appendix A Document revision history
Version
Revision scope
Date
V1.0
Initial version.
Jun. 6th, 2020