DirekTronik LWL02 Manuel utilisateur

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

Page 2 / 20 - 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

•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

Page 3 / 20 - last modiﬁed by Xiaoling on 2022/12/27 16:58

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.



Page 5 / 20 - last modiﬁed by Xiaoling on 2022/12/27 16:58

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.

Page 6 / 20 - last modiﬁed by Xiaoling on 2022/12/27 16:58

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

Page 8 / 20 - last modiﬁed by Xiaoling on 2022/12/27 16:58

User Manual for LoRaWAN End Nodes - LWL02 - LoRaWAN Water Leak Sensor User Manual

Add APP KEY and DEV EUI

Page 9 / 20 - last modiﬁed by Xiaoling on 2022/12/27 16:58

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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