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.

21

)))

22

23

(((

24

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.

33

)))

34

35

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

== 1.2 Features ==

* LoRaWAN Class A v1.0.3

42

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

43

* SX1262 LoRa Core

44

* Water Leak detect

45

* 2 x AAA LR03 Batteries

46

* AT Commands to change parameters

47

* Uplink on periodically and open/close action

48

* Remote configure parameters via LoRa Downlink

49

* Firmware upgradable via program port

50

51

== 1.3 Applications ==

52

53

* Smart Buildings & Home Automation

54

* Logistics and Supply Chain Management

* Smart Metering

* Smart Agriculture

* Smart Cities

* Smart Factory

== 1.4 Dimension ==

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

63

64

[[image:1654670405145-346.png]]

== 1.5 Firmware Change log ==

69

70

LWL02 use the same firmware as LDS01.

71

72

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

= 2. Power ON LWL02 =

77

78

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 =

83

84

(((

85

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.

86

)))

87

88

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

= 4. Operation Mode =

93

94

== 4.1 How it works? ==

95

96

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.

97

98

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 ==

103

104

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.

105

106

[[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.

115

)))

116

* (((

117

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

118

)))

119

* (((

120

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

121

)))

122

* (((

123

A message when switch from water leak to none water leak. ([[Alarm event can be disabled>>||anchor="H7.3CanIdisableuplinkforeacheventtosavebatterylife3F"]])

)))

(((

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:

136

)))

137

138

[[image:1654671040430-368.png]]

139

140

141

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

142

143

**Add APP EUI in the application**

144

145

[[image:1654671794691-956.png]]

146

147

148

[[image:1654671809850-574.png]]

149

150

[[image:1654671820156-640.png]]

151

152

153

[[image:1654671832011-696.png]]

154

155

156

**Add APP KEY and DEV EUI**

157

158

159

(% 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.

160

161

[[image:1654671889112-678.png]]

== 4.3 Uplink Payload ==

166

167

Uplink Payload total 9 bytes.

168

169

[[image:image-20220608150921-5.png]]

**Example:**

[[image:1654672186477-234.png]]

(((

Example Payload Decoder in TTN V3: [[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/]]

)))

== 4.4 Downlink Payload ==

183

184

(% border="1" cellspacing="10" style="background-color:#ffffcc; color:green; width:410px" %)

185

|=(% style="width: 180px;" %)**Downlink Control Type**|=(% style="width: 80px;" %)**Type Code**|=(% style="width: 150px;" %)**Downlink payload size(bytes)**

186

|(% style="width:180px" %)TDC (Transmit Time Interval—Keep Alive Interval)|(% style="width:80px" %)0x01|(% style="width:150px" %)4

187

|(% style="width:180px" %)RESET|(% style="width:80px" %)0x04|(% style="width:224px" %)2

188

|(% style="width:180px" %)[[Set confirmed mode>>||anchor="HTypeCode0x05"]]|(% style="width:80px" %)0x05|(% style="width:150px" %)2

189

|(% style="width:180px" %)[[Clear Counting>>||anchor="HTypeCode0xA6"]]|(% style="width:80px" %)0xA6|(% style="width:150px" %)2

190

|(% style="width:180px" %)[[Enable/Disable Alarm>>||anchor="HTypeCode0xA7"]]|(% style="width:80px" %)0xA7|(% style="width:150px" %)2

191

|(% style="width:180px" %)[[Control ADR/DR>>||anchor="HTypeCode0xA8"]]|(% style="width:80px" %)0xA8|(% style="width:150px" %)3

192

|(% style="width:180px" %)[[Set Alarm Timeout>>||anchor="HTypeCode0xA9"]]|(% style="width:80px" %)0xA9|(% style="width:150px" %)4

193

194

Example Downlink payload setting in TTN V3:

195

196

[[image:1654673412319-976.png]]

197

198

199

=== (% style="color:#037691" %)**Type Code 0x01**(%%) ===

200

201

If the payload=0100003C, means to control the LWL02’s Keep Alive interval to 0x00003C=60(S)

202

203

204

=== (% style="color:#037691" %)**Type Code 0x04**(%%) ===

205

206

If payload = 0x04FF, it will reset the LWL02.

207

208

209

=== (% style="color:#037691" %)**Type Code 0x05**(%%) ===

210

211

0x05 00: Set uplink to LoRaWAN unconfirmed mode

212

213

0x05 01: Set uplink to LoRaWAN confirmed mode

214

215

216

=== (% style="color:#037691" %)**Type Code 0xA6**(%%) ===

217

218

Example: 0xA601: Clear Counting

219

For LWL02: reset both count number and time.

220

221

222

=== (% style="color:#037691" %)**Type Code 0xA7**(%%) ===

223

224

0xA7 01 : Equal to AT+DISALARM=1

225

226

0xA7 00 : Equal to AT+DISALARM=0

227

228

229

=== (% style="color:#037691" %)**Type Code 0xA8**(%%) ===

Format: 0xA8 aa bb

aa: 1: Enable ADR; 0: Disable ADR (Same as AT+CADR command)

234

235

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

236

237

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

238

239

240

=== (% style="color:#037691" %)**Type Code 0xA9**(%%) ===

241

242

See [[Alarm Base Timeout>>||anchor="H4.6AlarmBaseonTimeout"]] for detail.

== 4.5 Integrate with Datacake ==

247

248

(((

249

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:

)))

(% style="color:blue" %)**Step 1**(%%): Be sure that your device is programmed and properly connected to the network at this time.

254

255

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

256

257

258

[[image:1654674520913-519.png]]

259

260

261

[[image:1654674530910-914.png]]

262

263

264

[[image:1654674543078-401.png]]

265

266

267

(% style="color:blue" %)**Step 3**(%%): Create an account or log in Datacake.

268

269

(% style="color:blue" %)**Step 4**(%%): Search LWL02 and add DevEUI.

270

271

[[image:1654674556510-911.png]]

272

273

274

== 4.6 Alarm Base on Timeout ==

275

276

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.

277

278

279

User configure this feature by using:

280

281

282

(% style="color:blue" %)**AT Command**(%%) to configure:

283

284

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

285

286

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.

287

288

* **AT+TTIG=0,0** **~-~->** Default Value, disable timeout Alarm.

289

290

(% style="color:blue" %)**Downlink Command**(%%) to configure:

291

292

**Command: 0xA9 aa bb cc**

293

294

A9: Command Type Code

295

296

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.

== 4.7 LEDs ==

(% border="1" cellspacing="10" style="background-color:#ffffcc; width:463px" %)

312

|=(% style="width: 184px;" %)**Action**|=(% style="width: 275px;" %)**LED behavior**

313

|(% style="width:184px" %)Power On|(% style="width:275px" %)(% style="color:green" %)**GREEN on 1s, **(% style="color:red" %)**RED on 1s,**(%%)** (% style="color:blue" %)BLUE on 1s(%%)**

314

|(% style="width:184px" %)Joined successful|(% style="width:275px" %)(% style="color:green" %)**GRENN LED **(%%)on 5s

315

|(% style="width:184px" %)Send an uplink message|(% style="width:275px" %)(% style="color:green" %)**GREEN LED**(%%) blinks once

316

|(% style="width:184px" %)Got a downlink message|(% style="width:275px" %)(% style="color:blue" %)**BLUE LED**(%%) blinks once

317

318

319

= 5. Battery & How to replace =

320

321

== 5.1 Battery Type and replace ==

322

323

(((

324

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.

329

)))

330

1. (((

331

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

)))

(((

(% style="color:red" %)**Important Notice: Make sure use new AAA LR03 battery and the battery doesn’t have broken surface.**

)))

(((

)))

(((

Example of AAA LR03 batter:

344

)))

345

346

[[image:1654675278044-307.png]]

1.

11. Power Consumption Analyze

353

354

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:

355

356

[[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

362

363

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

364

365

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

366

367

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:

377

378

The AT Access password is **123456**.

379

380

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

381

382

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

383

384

385

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.

386

387

388

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? ==

396

397

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? ==

403

404

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? ==

410

411

Yes, User can use below method to disable this:

412

413

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

414

415

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

416

417

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

418

419

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

420

421

0xA701 : Equal to AT+DISALARM=1

422

423

0xA700 : Equal to AT+DISALARM=0

= 8. Order Info =

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

431

432

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

433

434

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

435

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

436

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

437

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

438

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

439

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

440

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

441

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

442

* (% 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.

454

* 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]].

455

456

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

Applications

Navigation