LWL02 - LoRaWAN Water Leak Sensor User Manual

The Dragino LWL02 is a (% style="color:#4f81bd" %)**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.

17

)))

18

19

(((

20

LWL02 is powered by (% style="color:#4f81bd" %)**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 (% style="color:#4f81bd" %)**counts the water leak times**(%%) and (% style="color:#4f81bd" %)**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 (% style="color:#4f81bd" %)**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.

29

)))

30

31

[[image:image-20220608143744-1.png]]

== 1.2 Features ==

* LoRaWAN Class A v1.0.3

38

* Frequency Bands: CN470/EU433/KR920/US915/EU868/AS923/AU915/IN865/RU864

39

* SX1262 LoRa Core

40

* Water Leak detect

41

* 2 x AAA LR03 Batteries

42

* AT Commands to change parameters

43

* Uplink on periodically and open/close action

44

* Remote configure parameters via LoRa Downlink

45

* Firmware upgradable via program port

46

47

== 1.3 Applications ==

48

49

* Smart Buildings & Home Automation

50

* Logistics and Supply Chain Management

* Smart Metering

* Smart Agriculture

* Smart Cities

* Smart Factory

== 1.4 Dimension ==

[[image:image-20220608143952-2.png]]

59

60

[[image:1654670405145-346.png]]

== 1.5 Firmware Change log ==

65

66

LWL02 use the same firmware as LDS01.

67

68

[[LWL02 Image files – Download link>>url:http://www.dragino.com/downloads/index.php?dir=LoRa_End_Node/LDS01/Firmware/]]

= 2. Power ON LWL02 =

73

74

When receive the LWL02, please open the enclosure and add 2 x AAA batteries to power it. The [[LED>>||anchor="H4.7LEDs"]] will blink when device is powered.

= 3. How to install LWL02 =

79

80

(((

81

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.

82

)))

83

84

[[image:image-20220608144447-4.png]]

= 4. Operation Mode =

89

90

== 4.1 How it works? ==

91

92

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>>||anchor="H2.PowerONLWL02"]] the LWL02. It will auto join the network via OTAA.

93

94

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>>||anchor="H6.UseATCommand"]] to set the keys in the devices.

== 4.2 Example to join LoRaWAN network ==

99

100

Here shows an example for how to join the [[TTN V3 Network>>url:https://eu1.cloud.thethings.network/]]. Below is the network structure, we use [[LG308>>url:http://www.dragino.com/products/lora-lorawan-gateway/item/140-lg308.html]] as LoRaWAN gateway here.

101

102

[[image:1654671007127-335.png]]

(((

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.

111

)))

112

* (((

113

An emergency event message when detect a water leak. ([[Alarm event can be disabled>>||anchor="H7.3CanIdisableuplinkforeacheventtosavebatterylife?"]])

114

)))

115

* (((

116

A periodically update at every 10 minutes when in water leak.

117

)))

118

* (((

119

A message when switch from water leak to none water leak. ([[Alarm event can be disabled>>||anchor="H7.3CanIdisableuplinkforeacheventtosavebatterylife?"]])

)))

(((

The LG308 is already set to connect to [[TTN V3 network >>url:https://eu1.cloud.thethings.network/]]. What we need to now is only configure the TTN V3:

)))

(((

(% style="color:blue" %)**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:

132

)))

133

134

[[image:1654671040430-368.png]]

135

136

137

User can enter this key in their LoRaWAN Server portal. Below is TTN V3 screen shot:

138

139

**Add APP EUI in the application**

140

141

[[image:1654671794691-956.png]]

142

143

144

[[image:1654671809850-574.png]]

145

146

[[image:1654671820156-640.png]]

147

148

149

[[image:1654671832011-696.png]]

150

151

152

**Add APP KEY and DEV EUI**

153

154

155

(% style="color:blue" %)**Step 2**(%%): [[Power on>>||anchor="H2.PowerONLWL02"]] 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.

156

157

[[image:1654671889112-678.png]]

1.

11. Uplink Payload

Uplink Payload total 9 bytes.

164

165

166

|**Size(bytes)**|**2**|**1**|**3**|**3**

167

|value|Status&BAT|(((

MOD

Always:0x02

)))|Total water leak events|(((

Last water leak

duration (unit: min)

)))

Example:

[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image014.png]]

180

181

182

Example Payload Decoder in TTN V3:

183

184

[[http:~~/~~/www.dragino.com/downloads/index.php?dir=LoRa_End_Node/LDS01/Payload/>>url:http://www.dragino.com/downloads/index.php?dir=LoRa_End_Node/LDS01/Payload/]]

1.

11. Downlink Payload

|**Downlink Control Type**|**Type Code**|**Downlink payload size(bytes)**

193

|TDC (Transmit Time Interval—Keep Alive Interval)|0x01|4

194

|RESET|0x04|2

195

|[[Set confirmed mode>>path:#code05]]|0x05|2

196

|[[Clear Counting>>path:#codeA6]]|0xA6|2

197

|[[Enable/Disable Alarm>>path:#code70]]|0xA7|2

198

|[[Control ADR/DR>>path:#codeA8]]|0xA8|3

199

|[[Set Alarm Timeout>>path:#Alarm_Timeout]]|0xA9|4

200

201

Example Downlink payload setting in TTN V3:

202

203

[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image015.png]]

**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

219

220

0x05 01: Set uplink to LoRaWAN confirmed mode

**Type Code 0xA6**

Example: 0xA601: Clear Counting

226

For LWL02: reset both count number and time.

**Type Code 0xA7**

0xA7 01 : Equal to AT+DISALARM=1

232

233

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)

241

242

bb: set DR (Same as AT+CDATARATE ,only valid after ADR=0)

243

244

Example: 0x A8 00 02 : Set ADR=0 and DR=1

**Type Code 0xA9**

See [[Alarm Base Timeout>>path:#Alarm_Timeout]] for detail.

1.

11. Integrate with Datacake

255

256

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:

257

258

259

Step 1: Be sure that your device is programmed and properly connected to the network at this time.

260

261

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:

262

263

264

[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image016.png]]

265

266

267

[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image017.png]]

268

269

270

[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image018.png]]

Step 3: Create an account or log in Datacake.

275

276

Step 4: Search LWL02 and add DevEUI.

277

278

[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image019.png]]

1.

11. Alarm Base on Timeout

283

284

LWL02 can monitor the timeout for a status change, this feature can be used to monitor some event such as open fridge too long etc.

285

286

287

User configure this feature by using:

288

289

290

**AT Command** to configure:

291

292

* AT+TTRIG=1,30 à When status change from close to open, and device keep in open

293

294

status for more than 30 seconds. LWL02 will send an uplink packet, the Alarm bit (the lowest bit of 10^^th^^ byte of payload) on this uplink packet is set to 1.

295

296

* AT+TTIG=0,0 à Default Value, disable timeout Alarm.

297

298

**Downlink Command** to configure:

299

300

Command: 0xA9 aa bb cc

301

302

A9: Command Type Code

303

304

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.

1.

11. LEDs

|**Action**|**LED behavior**

322

|Power On|**GREEN on 1s, RED on 1s, BLUE on 1s**

323

|Joined successful|**GRENN LED **on 5s

324

|Send an uplink message|**GREEN LED** blinks once

325

|Got a downlink message|**BLUE LED** blinks once

326

327

1. Battery & How to replace

328

11. Battery Type and replace

329

330

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:

331

332

1. The LWL02 doesn’t have any screw, use can use nail to open it by the middle.

333

1. Make sure the direction is correct when install the AAA batteries.

334

335

**Important Notice: Make sure use new AAA LR03 battery and the battery doesn’t have broken surface.**

336

337

338

Example of AAA LR03 batter:

339

340

[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image020.png]]

1.

11. Power Consumption Analyze

347

348

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:

349

350

[[https:~~/~~/www.dragino.com/downloads/downloads/LoRa_End_Node/Battery_Analyze/DRAGINO_Battery_Life_Guide.pdf>>url:https://www.dragino.com/downloads/downloads/LoRa_End_Node/Battery_Analyze/DRAGINO_Battery_Life_Guide.pdf]]

1. Use AT Command

11. Access AT Command

356

357

LWL02 supports AT Command set. User can use a USB to TTL adapter to configure LWL02 via use AT command, as below.

358

359

[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image021.png]]

360

361

USB to TTL <- -> LWL02

RX <- -> TX

TX <- -> RX

GND <- -> GND

In PC, User needs to set **serial tool**(such as [[putty>>url:https://www.chiark.greenend.org.uk/~~sgtatham/putty/latest.html]], SecureCRT) baud rate to **115200** to access to access serial console of LWL02. Below is the output for reference:

371

372

The AT Access password is **123456**.

373

374

[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image022.png]]

375

376

Each AT Command need to add an ENTER at the end before send.

377

378

379

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.

380

381

382

More detail AT Command manual can be found at [[AT Command Manual>>url:http://www.dragino.com/downloads/index.php?dir=LoRa_End_Node/LDS01/]]

= 7. FAQ =

== 7.1 How to upgrade the image? ==

390

391

User can upgrade the of LWL02 for bug fix, new features, or change working region. The upgrade instruction is here: [[Firmware Upgrade Instruction>>Firmware Upgrade Instruction for STM32 base products]]

== 7.2 How to change the LoRa Frequency Bands/Region? ==

397

398

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>>||anchor="H7.1Howtoupgradetheimage"]]. When download the images, choose the required image file for download.

== 7.3 Can I disable uplink for each event to save battery life? ==

404

405

Yes, User can use below method to disable this:

406

407

(% style="color:#4f81bd" %)**via AT Command**:

408

409

AT+DISALARM=1, End node will only send packet in TDC time.

410

411

AT+DISALARM=0, End node will send packet in TDC time or status change for door sensor.

412

413

(% style="color:#4f81bd" %)**via LoRaWAN downlink Command**:

414

415

0xA701 : Equal to AT+DISALARM=1

416

417

0xA700 : Equal to AT+DISALARM=0

= 8. Order Info =

**Part Number: (% style="color:blue" %)LWL02-XXX(%%)**

425

426

(% style="color:blue" %)**XXX:**

427

428

* (% style="color:red" %)**EU433**(%%): frequency bands EU433

429

* (% style="color:red" %)**EU868**(%%): frequency bands EU868

430

* (% style="color:red" %)**KR920**(%%): frequency bands KR920

431

* (% style="color:red" %)**CN470**(%%): frequency bands CN470

432

* (% style="color:red" %)**AS923**(%%): frequency bands AS923

433

* (% style="color:red" %)**AU915**(%%): frequency bands AU915

434

* (% style="color:red" %)**US915**(%%): frequency bands US915

435

* (% style="color:red" %)**IN865**(%%): frequency bands IN865

436

* (% style="color:red" %)**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.

448

* 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 [[support@dragino.com>>url:file:///D:/市场资料/说明书/LoRa/LT系列/support@dragino.com]].

449

450

Wiki source code of LWL02 - LoRaWAN Water Leak Sensor User Manual

Applications

Navigation