DirekTronik LWL02 User manual

LWL02 - LoRaWAN Water Leak Sensor User Manual
last modified by Xiaoling
on 2022/12/27 16:58

User Manual for LoRaWAN End Nodes - LWL02 - LoRaWAN Water Leak Sensor User Manual
Table of Contents
1. Introduction .......................................................................................................................................................................... 4
1.1 What is LWL02 LoRaWAN Water Leak Sensor ....................................................................................................... 4
1.2 Features .......................................................................................................................................................................... 4
1.3 Applications .................................................................................................................................................................... 4
1.4 Dimension ....................................................................................................................................................................... 4
1.5 Firmware Change log ................................................................................................................................................... 5
2. Power ON LWL02 .............................................................................................................................................................. 5
3. How to install LWL02 ........................................................................................................................................................ 5
4. Operation Mode .................................................................................................................................................................. 6
4.1 How it works? ................................................................................................................................................................ 6
4.2 Example to join LoRaWAN network ........................................................................................................................... 7
4.3 Uplink Payload ............................................................................................................................................................. 10
4.4 Downlink Payload ........................................................................................................................................................ 11
Type Code 0x01 .............................................................................................................................................................. 11
Type Code 0x04 .............................................................................................................................................................. 11
Type Code 0x05 .............................................................................................................................................................. 11
Type Code 0xA6 ............................................................................................................................................................. 12
Type Code 0xA7 ............................................................................................................................................................. 12
Type Code 0xA8 ............................................................................................................................................................. 12
Type Code 0xA9 ............................................................................................................................................................. 12
4.5 Integrate with Datacake ............................................................................................................................................. 12
4.6 Alarm Base on Timeout .............................................................................................................................................. 15
4.7 LEDs ............................................................................................................................................................................. 16
5. Battery & How to replace ................................................................................................................................................ 16
5.1 Battery Type and replace ........................................................................................................................................... 16
5.2 Power Consumption Analyze ..................................................................................................................................... 16
6. Use AT Command ........................................................................................................................................................... 16
6.1 Access AT Command ................................................................................................................................................ 16
7. FAQ .................................................................................................................................................................................... 18
7.1 How to upgrade the image? ...................................................................................................................................... 18
7.2 How to change the LoRa Frequency Bands/Region? ............................................................................................ 18
7.3 Can I disable uplink for each event to save battery life? ....................................................................................... 18
7.4 How to change Sub-Band for LWL02? .................................................................................................................... 19
7.5 My sensor works for Helium AU915 before but not it doesn't work, Why? .......................................................... 19
8. Order Info .......................................................................................................................................................................... 19
9. Packing Info ...................................................................................................................................................................... 20
10. Support ............................................................................................................................................................................ 20
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User Manual for LoRaWAN End Nodes - LWL02 - LoRaWAN Water Leak Sensor User Manual
Table of Contents:
•1. Introduction
•1.1 What is LWL02 LoRaWAN Water Leak Sensor
•1.2 Features
•1.3 Applications
•1.4 Dimension
•1.5 Firmware Change log
•2. Power ON LWL02
•3. How to install LWL02
•4. Operation Mode
•4.1 How it works?
•4.2 Example to join LoRaWAN network
•4.3 Uplink Payload
•4.4 Downlink Payload
•Type Code 0x01
•Type Code 0x04
•Type Code 0x05
•Type Code 0xA6
•Type Code 0xA7
•Type Code 0xA8
•Type Code 0xA9
•4.5 Integrate with Datacake
•4.6 Alarm Base on Timeout
•4.7 LEDs
•5. Battery & How to replace
•5.1 Battery Type and replace
•5.2 Power Consumption Analyze
•6. Use AT Command
•6.1 Access AT Command
•7. FAQ
•7.1 How to upgrade the image?
•7.2 How to change the LoRa Frequency Bands/Region?
•7.3 Can I disable uplink for each event to save battery life?
•7.4 How to change Sub-Band for LWL02?
•7.5 My sensor works for Helium AU915 before but not it doesn't work, Why?
•8. Order Info
•9. Packing Info
•10. Support
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User Manual for LoRaWAN End Nodes - LWL02 - LoRaWAN Water Leak Sensor User Manual
1. Introduction
1.1 What is LWL02 LoRaWAN Water Leak Sensor
The Dragino LWL02 is a LoRaWAN Water Sensor. When there is water between the two metal probes, LWL02
indicates a water leak event and uplink to IoT server via LoRaWAN network.
LWL02 is powered by 2 x AAA batteries and target for long time use, these two batteries can provide about 16,000
~ 70,000 uplink packets, which result in 2 ~ 10 years battery life. After battery running out, user can easily open the
enclosure and replace with 2 common AAA batteries.
The LWL02 will send periodically data every day as well as for each water leak event. It also counts the water
leak times and calculate last water leak duration. User can also disable the uplink for each water leak event,
instead, device can count each event and uplink periodically.
Each LWL02 is pre-load with a set of unique keys for LoRaWAN registration, register these keys to LoRaWAN
server and it will auto connect after power on.

1.2 Features
• LoRaWAN Class A v1.0.3
• Frequency Bands: CN470/EU433/KR920/US915/EU868/AS923/AU915/IN865/RU864
• SX1262 LoRa Core
• Water Leak detect
• 2 x AAA LR03 Batteries
• AT Commands to change parameters
• Uplink on periodically and open/close action
• Remote configure parameters via LoRa Downlink
• Firmware upgradable via program port
1.3 Applications
• Smart Buildings & Home Automation
• Logistics and Supply Chain Management
• Smart Metering
• Smart Agriculture
• Smart Cities
• Smart Factory
1.4 Dimension
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User Manual for LoRaWAN End Nodes - LWL02 - LoRaWAN Water Leak Sensor User Manual
1.5 Firmware Change log
LWL02 use the same firmware as LDS01:https://www.dropbox.com/sh/6ls5i0zsvujvbc8/
AABe3V5aQXdy7zSxEdEA3DHOa?dl=0

2. Power ON LWL02
When receive the LWL02, please open the enclosure and add 2 x AAA batteries to power it. The LED will blink
when device is powered.
3. How to install LWL02
When install the LWL02 on wall. Please install as below so the water leak probe will be soak in water for water
detect purpose. The LWL02 main body is not water proof. Please don't let water go inside the LWL02 main body.

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User Manual for LoRaWAN End Nodes - LWL02 - LoRaWAN Water Leak Sensor User Manual
4. Operation Mode
4.1 How it works?
The LWL02 is configured as LoRaWAN OTAA Class A mode by default. It has OTAA keys to join network. To
connect a local LoRaWAN network, user just need to input the OTAA keys in the network server and power on the
LWL02. It will auto join the network via OTAA.
In case user can't set the OTAA keys in the network server and has to use the existing keys from server. User can
use AT Command to set the keys in the devices.
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User Manual for LoRaWAN End Nodes - LWL02 - LoRaWAN Water Leak Sensor User Manual
4.2 Example to join LoRaWAN network
Here shows an example for how to join the TTN V3 Network. Below is the network structure, we use LG308 as
LoRaWAN gateway here.
The LWL02 has water leak detect probe as above. When there is water between these two detect probe, they will
be short and generate the water leak event. and send the status to LoRaWAN server. The LWL02 will uplink two
type of messages to the server.
• A keep-alive message which send once per day.
• An emergency event message when detect a water leak. (Alarm event can be disabled)
• A periodically update at every 10 minutes when in water leak.
• A message when switch from water leak to none water leak. (Alarm event can be disabled)

The LG308 is already set to connect to TTN V3 network. What we need to now is only configure the TTN V3:
Step 1: Create a device in TTN V3 with the OTAA keys from LWL02.
Each LWL02 is shipped with a sticker with unique device EUI:
User can enter this key in their LoRaWAN Server portal. Below is TTN V3 screen shot:
Add APP EUI in the application
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User Manual for LoRaWAN End Nodes - LWL02 - LoRaWAN Water Leak Sensor User Manual
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User Manual for LoRaWAN End Nodes - LWL02 - LoRaWAN Water Leak Sensor User Manual
Add APP KEY and DEV EUI
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User Manual for LoRaWAN End Nodes - LWL02 - LoRaWAN Water Leak Sensor User Manual
Step 2: Power on LWL02 and it will auto join to the TTN V3 network. After join success, it will start to upload
message to TTN V3 and user can see in the panel.
4.3 Uplink Payload
Uplink Payload total 10 bytes.
Size(bytes） 2 1 3 3 1
value Status&BAT MOD
Always:0x02
Total_water_leak_events Last water leak
duration(unit:min)
Alarm status(Only used in
LDS02)Always:0x00
Example:
Example Payload Decoder in TTN V3:https://github.com/dragino/dragino-end-node-decoder
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User Manual for LoRaWAN End Nodes - LWL02 - LoRaWAN Water Leak Sensor User Manual
4.4 Downlink Payload
Downlink Control Type Type Code Downlink payload size(bytes)
TDC (Transmit Time Interval—Keep Alive
Interval)
0x01 4
RESET 0x04 2
Set confirmed mode 0x05 2
Clear Counting 0xA6 2
Enable/Disable Alarm 0xA7 2
Control ADR/DR 0xA8 3
Set Alarm Timeout 0xA9 4
Example Downlink payload setting in TTN V3:
Type Code 0x01
If the payload=0100003C, means to control the LWL02's Keep Alive interval to 0x00003C=60(S)
Type Code 0x04
If payload = 0x04FF, it will reset the LWL02.
Type Code 0x05
0x05 00: Set uplink to LoRaWAN unconfirmed mode
0x05 01: Set uplink to LoRaWAN confirmed mode
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User Manual for LoRaWAN End Nodes - LWL02 - LoRaWAN Water Leak Sensor User Manual
Type Code 0xA6
Example: 0xA601: Clear Counting
For LWL02: reset both count number and time.
Type Code 0xA7
0xA7 01 : Equal to AT+DISALARM=1
0xA7 00 : Equal to AT+DISALARM=0
Type Code 0xA8
Format: 0xA8 aa bb
aa: 1: Enable ADR; 0: Disable ADR (Same as AT+CADR command)
bb: set DR (Same as AT+CDATARATE ,only valid after ADR=0)
Example: 0x A8 00 02 : Set ADR=0 and DR=1
Type Code 0xA9
See Alarm Base Timeout for detail.
4.5 Integrate with Datacake
Datacake provides a human friendly interface to show the sensor data, once we have data in TTN V3, we can use
Datacake to connect to TTN V3 and see the data in Datacake. Below are the steps:
Step 1: Be sure that your device is programmed and properly connected to the network at this time.
Step 2: To configure the Application to forward data to Datacake you will need to add integration. To add the
Datacake integration, perform the following steps:
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Step 3: Create an account or log in Datacake.
Step 4: Search LWL02 and add DevEUI.
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User Manual for LoRaWAN End Nodes - LWL02 - LoRaWAN Water Leak Sensor User Manual
4.6 Alarm Base on Timeout
LWL02 can monitor the timeout for a status change, this feature can be used to monitor some event such as
monitoring water leakage duration etc.
(This command is only applicable to LDS02.In lwl02, this command can only open the alarm, but the
alarm time is fixed to 10 minutes）
User configure this feature by using:

AT Command to configure:
•AT+TTRIG=1,30 -->When status change from close to open, and device keep in open
status for more than 30 seconds. LWL02 will send an uplink packet, the Alarm bit (the lowest bit of 10th byte of
payload) on this uplink packet is set to 1.
•AT+TTRIG=0,0 -->Default Value, disable timeout Alarm.

Downlink Command to configure:
Command: 0xA9 aa bb cc
A9: Command Type Code
aa: status to be monitor
bb cc: timeout.

If user send 0xA9 01 00 1E: equal to AT+TTRIG=1,30
Or
0xA9 00 00 00: Equal to AT+TTRIG=0,0. Disable timeout Alarm.

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User Manual for LoRaWAN End Nodes - LWL02 - LoRaWAN Water Leak Sensor User Manual
4.7 LEDs
Action LED behavior
Power On GREEN on 1s,RED on 1s, BLUE on 1s
Joined successful GRENN LEDon 5s
Send an uplink message GREEN LED blinks once
Got a downlink message BLUE LED blinks once
5. Battery & How to replace
5.1 Battery Type and replace
LWL02 is equipped with 2 x AAA LR03 batteries. If the batteries running low(see 2.1v in the platform). User can buy
generic AAA battery and replace it. Note:
1. The LWL02 doesn't have any screw, use can use nail to open it by the middle.
2. Make sure the direction is correct when install the AAA batteries.
Important Notice: Make sure use new AAA LR03 battery and the battery doesn't have broken surface.

Example of AAA LR03 batter:
5.2 Power Consumption Analyze
Dragino battery powered products are all run in Low Power mode. User can check the guideline from this link to
calculate the estimate battery life:
https://www.dragino.com/downloads/downloads/LoRa_End_Node/Battery_Analyze/
DRAGINO_Battery_Life_Guide.pdf
6. Use AT Command
6.1 Access AT Command
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User Manual for LoRaWAN End Nodes - LWL02 - LoRaWAN Water Leak Sensor User Manual
LWL02 supports AT Command set. User can use a USB to TTL adapter to configure LWL02 via use AT
command, as below.
In PC, User needs to set serial tool(such as putty, SecureCRT) baud rate to 115200 to access to access serial
console of LWL02. Below is the output for reference:
The AT Access password is 123456.
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User Manual for LoRaWAN End Nodes - LWL02 - LoRaWAN Water Leak Sensor User Manual
Each AT Command need to add an ENTER at the end before send.
When entering the first command, the RED LED will on and user can now input AT Commands. After input all
needed AT Commands, please input AT+CLPM=1 to set the device to work in Low Power mode and RED LED will
be off.
More detail AT Command manual can be found at AT Command Manual
7. FAQ
7.1 How to upgrade the image?
User can upgrade the of LWL02 for bug fix, new features, or change working region. The upgrade instruction is
here:Firmware Upgrade Instruction
7.2 How to change the LoRa Frequency Bands/Region?
If user has for example US915 frequency and want to change it to AS923 frequency. User can follow the
introduction for how to upgrade image. When download the images, choose the required image file for download.
7.3 Can I disable uplink for each event to save battery life?
Yes, User can use below method to disable this:
via AT Command:
AT+DISALARM=1, End node will only send packet in TDC time.
AT+DISALARM=0, End node will send packet in TDC time or status change for door sensor.
via LoRaWAN downlink Command:
0xA701: Equal to AT+DISALARM=1
0xA700: Equal to AT+DISALARM=0
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User Manual for LoRaWAN End Nodes - LWL02 - LoRaWAN Water Leak Sensor User Manual
7.4 How to change Sub-Band for LWL02?
Before v1.6 firmware: LWL02 works in Subband 2 by default in AU915 / US915 band. So if the LoRaWAN
server works in other subband, there will be issue for LWL02 to Join the server. In this case, User can use AT
COmmand to change the subband. See AT Command chapther for the hardware connection. Below are the steps to
change sub-band:
• Press rest button.
• Send 123456 password
• Send command AT+CFREQBANDMASK=0001( 0001 for subband 1, 0002 for subband 2, etc..)
• Press rest button to restart to new subband
• Example output:
[3369]DRAGINO LWL01 Device
[3370]Frequency Band: US915 v1.5
[3373]OTAA
[3374]DevEui= 7896785455246354
[3377]class type A
[3379]freq mode intra
[3381]scan chn mask 0x0002 --> use subband 2
LM502:~# [10793]txDone
123456 --> ENTER PASSWORD
Correct Password
[105115]rxTimeOut
AT+CFREQBANDMASK=0001 --> Change to Subband1
OK
[3371]DRAGINO LWL01 Device
[3373]Frequency Band: US915 v1.5
[3376]OTAA
[3377]DevEui= 7896785455246354
[3380]class type A
[3382]freq mode intra
[3384]scan chn mask 0x0001 --> reboot and works on Subband1 now
Since firmware v1.6:LWL02 works in chn mask 0x0000. where cover all subbands. so no need to use AT
Commands to change subband and it can works for every subband.
7.5 My sensor works for Helium AU915 before but not it doesn't work,
Why?
It is sub-band issue, See chapter 7.4.Helium Change the Subband for AU915 from subband2 to Subband1 which
cause the sensor doesn't work.
8. Order Info
Part Number: LWL02-XXX
XXX:
•EU433: frequency bands EU433
•EU868: frequency bands EU868
•KR920: frequency bands KR920
•CN470: frequency bands CN470
•AS923: frequency bands AS923
•AU915: frequency bands AU915
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User Manual for LoRaWAN End Nodes - LWL02 - LoRaWAN Water Leak Sensor User Manual
•US915: frequency bands US915
•IN865: frequency bands IN865
•CN779: frequency bands CN779
9. Packing Info
Package Includes:
• LWL02 x 1
10. Support
• Support is provided Monday to Friday, from 09:00 to 18:00 GMT+8. Due to different timezones we cannot
offer live support. However, your questions will be answered as soon as possible in the before-mentioned
schedule.
• Provide as much information as possible regarding your enquiry (product models, accurately describe your
problem and steps to replicate it etc) and send a mail to[email protected].

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