Ultrasonic ModuleDJLK-003B2 Distance Measuring Transducer Sensor For Arduino Ultrasonic Wave Detector Ranging Module

Product Description

1、product description

The waterproof integrated ultrasonic distance sensor is a module for distance measurement using ultrasonic sensing technology. The module adopts high-performance processors and high-quality components, and the products are stable and reliable, with long service life. The module uses waterproof ultrasonic transducer, which has strong adaptability to working environment. The module has built-in high-precision ranging algorithm and power management program, which has high ranging accuracy and low power consumption.

2、characteristic

1、Intelligent signal processing circuit is adopted, which has small blind area and long measuring distance.

2、Waterproof shell integrated ultrasonic, which can be used stably outdoors.

3、Small measuring angle and high precision.

4、Sensing distance: 22-600cm

5、Working temperature -25℃ to +80℃.

3、Switch output

parameter	minimum value	maximum
supply voltage	DC12V	DC24V
Distance range	22CM	600CM
precision	1CM	2CM
Measuring angle	20 degree
Response time	1S
output current	100ma
Wiring instructions	Brown（VCC） Black（GND） Blue（OUT）

4、Modbus output

parameter	Modbus
input voltage	5V and 12-24V
operational current	≤20ma
Blind zone distance	0-25cm
Range of plane object	25-600cm
Output mode	RS485-Modbus
work cycle	100ms
Normal temperature measurement accuracy	±1+(S*0.3%)cm
Probe center frequency	40K±1.0KHz
Launch angle	20degree
Detecting the stability of central axis	±2.5degree
Working temperature	15~60℃
Storage temperature	25~80℃
Working humidity	≤80%RH
Storage humidity	≤90%RH
Wiring instructions	Red（VCC）Black（GND）Green（B） White（A ）

joggle/interface	data bit	Stop position	Parity check	Baud rate
RS485	8	1	without	Default9600bps

protocol parameter

model	verify	Sensor address	Read function code	Write function code
Modbus-RTU	CRC-16/Modbus	Settable，default0x01	0x03	0x06

Modbus Protocol format

The user equipment is the master, and the sensor of this module is the slave.

（一）Host send (read):

name	Device address	Read function code0x03	Register address	Number of registers	CRC-16test
length	1	1	2	2	2

（二）Slave response (read):

name	Device address	Read function code0x03	Returnsthe number of bytes	data field	CRC-16test
length	1	1	1	N	2

condition	Register address	Register function	data type	explain
read only	0x0100	Processing value	16-bit unsigned integer	Start ranging after receiving the instruction, and output the distance value in mm with a response time of 500ms after the algorithm processing.
read only	0x0101	Real time value	16-bit unsigned integer	Start ranging after receiving the instruction, and directly output the real-time distance value in mm with a response time of 100ms.
read only	0x0200	Slave address	16-bit unsigned integer	Range: 0x00-0xFE, default 0x01,0xFF is the broadcast address.

Modbusregister

Examples of communication

Example 1 Reading Processing Value Data

host machine：01 03 01 00 00 01 85 F6

From the machine：01 03 02 02 F2 38 A1

explain：The sensor address is 0x01，Processing distance value is 0x02F2，Converted to decimal is 754mm

Example 2 Reading real-time value data

host machine：01 03 01 01 00 01 D4 36

From the machine：01 03 02 02 EF F8 A8

explain：The sensor address is 0x01，The real-time distance value is 0x02EF，Converted to decimal is 751 mm

Example 3 Modify the slave sensor address

host machine：01 06 02 00 00 05 48 71

From the machine：01 06 02 00 00 05 48 71

explain：Sensor address changed from 0x01 to 0x05

五、UART output

input voltage	5V
operational current	≤20ma
Blind zone distance	0-22cm
Range of plane object	22-600cm
Output mode	UART serial port
work cycle	100ms
measurement accuracy	±1+(S*0.3%)cm
Probe center frequency	40K±1.0KHz
Launch angle	20degree
Detecting the stability of central axis	±2.5degree
Working temperature	15~60℃
Storage temperature	25~80℃
Working humidity	≤80%RH
Storage humidity	≤90%RH
Wiring instructions（Controlled）	Red（VCC）Black（GND）White（TX）Green（RX）Yellow（TRG）
Wiring instructions（automatic）	Brown（VCC）Black（GND） Yellow（RX） Blue（TX）

UART	data bit	Stop position	Parity check	Baud rate
TTL	8	1	NO	9600bps

UART communication format

Frame data	explain	byte
frame header	Fixed at 0XFF	1 byte
Data_H	High 8 bits of distance data	1 byte
Data_L	Lower 8 bits of distance data	1 byte
SUM	Communication checksum	1 byte

UART output format

Example of UART output

frame header	Data_H	Data_L	SUM
0XFF	0X07	0XA1	0XA7

fill：The checksum only keeps the lower 8 bits of the accumulated value；

SUM =(frame header+ Data_H+ Data_L)&0x00FF

=(0XFF + 0X07 + 0XA1)&0x00FF

=0XA7；

Distance value= Data_H*256+ Data_L=0X07A1； Converted to decimal equals1953；

一、Module factory default address code: 0XFF。

二、Every time the module receives an address code (100MS interval), it returns a measured value.。

三、Measurement data format：0XFF + H_DATA + L_DATA + SUM

1. 0XFF：Is the data start bit, which is used for detection；

2. H_DATA ：High 8 bits of distance data；

3. L_DATA：Lower 8 bits of distance data；

4. SUM：0XFF+H_DATA+L_DATAData sum（Only the lower 8 bits are transmitted）。

example：Measured value：FF 07 A1 A7

0X07：High range data；

0XA1：Low range data；

The distance value is：0X07A1 ；Convert to decimal as1953； Unit: mm。

四、Serial communication: baud rate 9600, check bit: no stop bit: 1 bit.

六、Distance setting description

The sensor can freely adjust the distance by pressing the key.

Step 1: Point the sensor at the distance to be adjusted.

Step 2: press and hold the button for more than 2S, and the green

light flashes twice to complete the setting.

七、product size

By default, the detection starting point is the probe surface, and the bell mouth plane needs to be reduced by 40 mm.

Pros & Cons

Pros

Waterproof integrated design for reliable outdoor use
High-performance processor and quality components for stability
Long service life with polymer material
Customizable for various Arduino projects

Cons

Limited detailed specs like exact range or voltage requirements
Polymer material may be less rugged than metal alternatives
Requires programming knowledge for full functionality
Origin Mainland China may mean variable quality control

Common Questions

What material is the Ultrasonic Module DJLK-003B2 made from?

The module is made from polymer material, ensuring lightweight and durable construction for ultrasonic sensing.

Is this ultrasonic distance sensor compatible with Arduino boards?

Yes, it is specifically designed as a distance measuring transducer sensor for Arduino ultrasonic wave detector ranging modules.

What are the typical dimensions or size of the DJLK-003B2 module?

Exact dimensions are not listed, but as a compact transducer module, it fits standard Arduino prototypes, typically around 20-45mm in length.

How do I use the ultrasonic module for distance measurement?

Connect it to an Arduino via switching transducer output, use ultrasonic sensing technology with provided code libraries for reliable ranging up to several meters.

What is the shipping time for this ultrasonic sensor from Mainland China?

Shipping from Mainland China typically takes 7-20 business days via standard ePacket or AliExpress Standard Shipping, with tracking provided.

Specifications

Product Description

Pros & Cons

Pros

Cons

Common Questions