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	10	+= 1. Introduction =
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	12	+== 1.1 What is LWL02 LoRaWAN Water Leak Sensor ==
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	15	+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.
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14		-1. Introduction
15		-11. What is LWL02 LoRaWAN Water Leak Sensor
	17	+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.
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17		-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.
	19	+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.
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	21	+Each LWL02 is (% style="color:#4f81bd" %)**pre-load with a set of unique keys**(%%) for LoRaWAN registration, register these keys to
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20		-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.
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23		-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.
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26		-Each LWL02 is pre-load with a set of unique keys for LoRaWAN registration, register these keys to
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28	28	LoRaWAN server and it will auto connect after power on. [[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image002.png]]
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33		-*
	28	+*
34	34	*1. Features
35	35	* LoRaWAN Class A v1.0.3
36	36	* Frequency Bands: CN470/EU433/KR920/US915/EU868/AS923/AU915/IN865/RU864
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42	42	* Remote configure parameters via LoRa Downlink
43	43	* Firmware upgradable via program port
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45		-*
	40	+*
46	46	*1. Applications
47	47	* Smart Buildings & Home Automation
48	48	* Logistics and Supply Chain Management
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51	51	* Smart Cities
52	52	* Smart Factory
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54		-1.
	49	+1.
55	55	11. Dimension
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57	57	[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image003.png]]
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102	102	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>>path:#AT_Command]] to set the keys in the devices.
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	100	+1.
106	106	11. Example to join LoRaWAN network
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108	108	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.
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118	118	* A periodically update at every 10 minutes when in water leak.
119	119	* A message when switch from water leak to none water leak. ([[Alarm event can be disabled>>path:#Alarm]])
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121		-
122	122	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:
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124	124	**Step 1**: Create a device in TTN V3 with the OTAA keys from LWL02.
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192	192	11. Downlink Payload
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194	194	|**Downlink Control Type**|**Type Code**|**Downlink payload size(bytes)**
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201	201	|[[Set Alarm Timeout>>path:#Alarm_Timeout]]|0xA9|4
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205	205	Example Downlink payload setting in TTN V3:
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207	207	[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image015.png]]
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	250	+1.
258	258	11. Integrate with Datacake
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260	260	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:
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323	323	11. LEDs
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325	325	|**Action**|**LED behavior**
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329	329	|Got a downlink message|**BLUE LED** blinks once
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333	333	1. Battery & How to replace
334	334	11. Battery Type and replace
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