Dragino LWL02 User manual

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LoRaWAN Water Leak Sensor User Manual 1 / 25
LWL02 –LoRaWAN Door Sensor User Manual
Document Version: 1.2
Image Version: v1.3
Version
Description
Date
1.0
Release
2021-May-16
1.1
Fix payload description error
2021-Jun-3
1.2
Add More Battery Description
2021-Jul-1

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1. Introduction..............................................................................................................................4
1.1 What is LWL02 LoRaWAN Door Sensor ......................................................................................4
1.2 Features......................................................................................................................................5
1.3 Applications................................................................................................................................5
1.4 Dimension...................................................................................................................................5
1.5 Firmware Change log .................................................................................................................5
2. Power ON LWL02 ......................................................................................................................6
3. How to install LWL02.................................................................................................................6
4. Operation Mode .......................................................................................................................7
4.1 How it works?.............................................................................................................................7
4.2 Example to join LoRaWAN network............................................................................................7
4.3 Uplink Payload..........................................................................................................................12
4.4 Downlink Payload.....................................................................................................................13
4.5 Integrate with Datacake...........................................................................................................16
4.6 Alarm Base on Timeout ............................................................................................................19
4.7 LEDs..........................................................................................................................................20
5. Battery & How to replace........................................................................................................21
5.1 Battery Type and replace..........................................................................................................21
5.2 Power Consumption Analyze ....................................................................................................21
6. Use AT Command....................................................................................................................23
6.1 Access AT Command.................................................................................................................23
7. FAQ.........................................................................................................................................24
7.1 How to upgrade the image?.....................................................................................................24
7.2 How to change the LoRa Frequency Bands/Region? ................................................................24
7.3 Can I disable uplink for each event to save battery life? ..........................................................24
8. Order Info ...............................................................................................................................25
9. Packing Info ............................................................................................................................25

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10. Support ..............................................................................................................................25

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1. Introduction
1.1 What is LWL02 LoRaWAN Door 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.

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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
1.5 Firmware Change log
LWL02 use the same firmware as LDS01.
LWL02 Image files –Download link

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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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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.
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:

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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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LWL02 and LWL01 use the same payload structure. So choose LWL01 as the model here.