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Version 40.1 by Edwin Chen on 2022/05/22 23:56
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Edwin Chen 2.1 1 {{box cssClass="floatinginfobox" title="**Contents**"}}
2 {{toc/}}
3 {{/box}}
4
5 = Overview =
6
7 [[image:LHT65N_10.png||alt="LHT65_Image" height="265" width="265"]]
8
9
10 The Dragino LHT65N Temperature & Humidity sensor is a Long Range LoRaWAN Sensor. It includes a(% class="mark" %) **built-in Temperature & Humidity sensor**(%%) and has an external sensor connector to connect to an external (% class="mark" %)**Temperature Sensor**(%%)**.**
11
12 The LHT65N allows users to send data and reach extremely long ranges. It provides ultra-long range spread spectrum communication and high interference immunity whilst minimizing current consumption. It targets professional wireless sensor network applications such as irrigation systems, smart metering, smart cities, building automation, and so on.
13
Edwin Chen 6.1 14 LHT65N has a built-in 2400mAh non-chargeable battery which can be used for up to 10 years*.
Edwin Chen 2.1 15
16 LHT65N is full compatible with LoRaWAN v1.0.3 Class A protocol, it can work with a standard LoRaWAN gateway.
17
Edwin Chen 6.1 18 LHT65N supports (% class="mark" %)Datalog Feature(%%). It will record the data when there is no network coverage and users can retrieve the sensor value later to ensure no miss for every sensor reading.
Edwin Chen 2.1 19
Edwin Chen 6.1 20 *The actual battery life depends on how often to send data, please see the battery analyzer chapter.
Edwin Chen 2.1 21
22
23 == Features: ==
24
25 * Wall mountable
26 * LoRaWAN v1.0.3 Class A protocol
27 * Frequency Bands: CN470/EU433/KR920/US915/EU868/AS923/AU915
28 * AT Commands to change parameters
29 * Remote configure parameters via LoRaWAN Downlink
Edwin Chen 15.1 30 * Firmware upgradeable via program port
Edwin Chen 6.1 31 * Built-in 2400mAh battery for up to 10 years of use.
Edwin Chen 2.1 32 * Built-in Temperature & Humidity sensor
33 * Optional External Sensors
Edwin Chen 6.1 34 * Tri-color LED to indicate working status
Edwin Chen 2.1 35 * Datalog feature
36
37 == Specification: ==
38
39 **Built-in Temperature Sensor:**
40
41 * Resolution: 0.01 °C
42 * Accuracy Tolerance : Typ ±0.3 °C
43 * Long Term Drift: < 0.02 °C/yr
Edwin Chen 6.1 44 * Operating Range: -40 ~~ 85 °C
Edwin Chen 2.1 45
46 **Built-in Humidity Sensor:**
47
48 * Resolution: 0.04 %RH
49 * Accuracy Tolerance : Typ ±3 %RH
50 * Long Term Drift: < 0.02 °C/yr
51 * Operating Range: 0 ~~ 96 %RH
52
Edwin Chen 6.1 53 **External Temperature Sensor:**
Edwin Chen 2.1 54
55 * Resolution: 0.0625 °C
56 * ±0.5°C accuracy from -10°C to +85°C
57 * ±2°C accuracy from -55°C to +125°C
58 * Operating Range: -55 °C ~~ 125 °C
59
Edwin Chen 18.1 60 = Connect LHT65N to IoT Server =
61
62 == How does LHT65N work? ==
63
64 LHT65N is configured as LoRaWAN OTAA Class A mode by default. Each LHT65N is shipped with a worldwide unique set of OTAA keys. To use LHT65N in a LoRaWAN network, first, we need to put the OTAA keys in LoRaWAN Network Server and then activate LHT65N.
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66 If LHT65N is under the coverage of this LoRaWAN network. LHT65N can join the LoRaWAN network automatically. After successfully joining, LHT65N will start to measure environment temperature and humidity, and start to transmit sensor data to the LoRaWAN server. The default period for each uplink is 20 minutes.
67
68
69 == How to Activate LHT65N? ==
70
71 The LHT65N has two working modes:
72
73 * **Deep Sleep Mode**: LHT65N doesn’t have any LoRaWAN activation. This mode is used for storage and shipping to save battery life.
Edwin Chen 19.1 74 * **Working Mode**: In this mode, LHT65N works as LoRaWAN Sensor mode to Join LoRaWAN network and send out the sensor data to the server. Between each sampling/tx/rx periodically, LHT65 will be in STOP mode (IDLE mode), in STOP mode, LHT65N has the same power consumption as Deep Sleep mode. 
Edwin Chen 18.1 75
76 The LHT65N is set in deep sleep mode by default; The ACT button on the front is to switch to different modes:
77
78 [[image:image-20220515123819-1.png||height="379" width="317"]]
79
80 |**Behavior on ACT**|**Function**|**Action**
81 |**Pressing ACT between 1s < time < 3s**|Test uplink status|If LHT65N is already Joined to the LoRaWAN network, LHT65N will send an uplink packet, if LHT65N has an external sensor connected, blue led will blink once. If LHT65N has no external sensor, red led will blink once.
82 |**Pressing ACT for more than 3s**|Active Device|green led will fast blink 5 times, LHT65N will enter working mode and start to JOIN LoRaWAN network. green led will solid turn on for 5 seconds after join in network.
83 |**Fast press ACT 5 times**|Deactivate Device|red led will solid on for 5 seconds. This means LHT65N is in Deep Sleep Mode.
84
Edwin Chen 32.1 85 == Example to join LoRaWAN network ==
86
87 (% class="wikigeneratedid" %)
88 This section shows an example of how to join the TTN V3 LoRaWAN IoT server. Use with other LoRaWAN IoT servers is of a similar procedure.
89
90 (% class="wikigeneratedid" %)
91 [[image:image-20220522232442-1.png||height="387" width="648"]]
92
93 Assume the LPS8N is already set to connect to [[TTN V3 network>>url:https://eu1.cloud.thethings.network]], So it provides network coverage for LHT65N. Next we need to add the LHT65N device in TTN V3:
94
95
96 === **Step 1**: Create Device n TTN ===
97
98 Create a device in TTN V3 with the OTAA keys from LHT65N.
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100 Each LHT65N is shipped with a sticker with its device EUI, APP Key and APP EUI as below:
101
102 [[image:image-20220522232812-2.png||height="219" width="279"]]
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104 User can enter these keys in the LoRaWAN Server portal. Below is TTN V3 screenshot:
105
106 Add APP EUI in the application.
107
108 [[image:image-20220522232916-3.png]]
109
110
111 [[image:image-20220522232932-4.png]]
112
113
114 [[image:image-20220522232954-5.png]]
115
116 Note: LHT65N use same payload as LHT65.
117
118 [[image:image-20220522233026-6.png]]
119
120
121 Input APP EUI,  APP KEY and DEV EUI:
122
123 [[image:image-20220522233118-7.png]]
124
125
Edwin Chen 35.1 126 === Step 2: Activate LHT65N by pressing the ACT button for more than 5 seconds. ===
Edwin Chen 32.1 127
128 Use ACT button to activate LHT65N and it will auto-join to the TTN V3 network. After join success, it will start to upload sensor data to TTN V3 and user can see in the panel.
129
130 [[image:image-20220522233300-8.png]]
131
132
Edwin Chen 35.1 133 == Uplink Payload: ==
134
135 The uplink payload includes totally 11 bytes. Uplink packets use FPORT=2 and(% class="mark" %) every 20 minutes(%%) send one uplink by default.
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137 After each uplink, the (% class="mark" %)BLUE LED(%%) will blink once.
138
139
140 (% style="width:572px" %)
141 |(% style="width:106px" %)**Size(bytes)**|(% style="width:71px" %)**2**|(% style="width:128px" %)**2**|(% style="width:103px" %)**2**|(% style="width:72px" %)**1**|(% style="width:89px" %)**4**
142 |(% style="width:106px" %)**Value**|(% style="width:71px" %)[[BAT>>path:#Battery]]|(% style="width:128px" %)(((
143 [[Built-In>>path:#SHT20_Temperature]]
144
145 [[Temperature>>path:#SHT20_Temperature]]
146 )))|(% style="width:103px" %)(((
147 [[Built-in>>path:#SHT20_Humidity]]
148
149 [[Humidity>>path:#SHT20_Humidity]]
150 )))|(% style="width:72px" %)[[Ext>>path:#Extension_Sensor]] #|(% style="width:89px" %)[[Ext value>>path:#Extension_sensor_value]]
151
152 * The First 6 bytes: has fix meanings for every LHT65N.
153 * The 7th byte (EXT #): defines the external sensor model.
154 * The 8^^th^^ ~~ 11^^th^^ byte: the value for external sensor value. The definition is based on external sensor type. (If EXT=0, there won’t be these four bytes.)
155
156
157 === Decoder in TTN V3 ===
158
159 When the uplink payload arrives TTNv3, it shows HEX format and not friendly to read. We can add LHT65N decoder in TTNv3 for friendly reading.
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161 Below is the position to put the decoder and LHT65N decoder can be download from here:
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163
164 [[image:image-20220522234118-10.png]]
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166
Edwin Chen 19.1 167 == LED Indicator ==
Edwin Chen 18.1 168
Edwin Chen 19.1 169 The LHT65N has a triple color LED which for easy shows different stage.
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171 While pressing ACT button, the LED will work as per LED status with ACT button.
172
173 In a normal working state:
174
175 * For each uplink, the BLUE LED or RED LED will blink once.
176 * BLUE LED when an external sensor is connected
177 * RED LED when an external sensor is not connected
178 * For each success downlink, the PURPLE LED will blink once
179
Edwin Chen 23.1 180 ----
Edwin Chen 19.1 181
Edwin Chen 21.1 182 == Installation ==
183
184 [[image:image-20220516231650-1.png||height="632" width="620"]]
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186
187
188
Edwin Chen 14.1 189 = Sensors & Accessories =
190
Edwin Chen 15.1 191 == E3 Temperature Probe ==
Edwin Chen 14.1 192
193 [[image:image-20220515080154-4.png||height="182" width="161"]] [[image:image-20220515080330-5.png||height="201" width="195"]]
194
195
196 With Temperature sensor with 2 meters cable long
197
198 * Resolution: 0.0625 °C
199 * ±0.5°C accuracy from -10°C to +85°C
200 * ±2°C accuracy from -55°C to +125°C
201 * Operating Range: -40 ~~ 125 °C
202 * -55°C to 125°C
203 * Working voltage 2.35v ~~ 5v
204
205
Edwin Chen 11.1 206 = Battery & How to replace =
207
208 == Battery Type ==
209
210 LHT65N is equipped with a 2400mAH Li-MnO2 (CR17505) battery . The battery is an un-rechargeable battery with low discharge rate targeting for up to 8~~10 years use. This type of battery is commonly used in IoT devices for long-term running, such as water meters.
211
212 The discharge curve is not linear so can’t simply use percentage to show the battery level. Below is the battery performance.
Edwin Chen 14.1 213 [[image:image-20220515075034-1.png||height="208" width="644"]]
Edwin Chen 11.1 214
215
216 The minimum Working Voltage for the LHT65N is ~~ 2.5v. When battery is lower than 2.6v, it is time to change the battery.
217
218
219 == Replace Battery ==
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221 LHT65N has two screws on the back, Unscrew them, and changing the battery inside is ok. The battery is a general CR17450 battery. Any brand should be ok.
222
223 [[image:image-20220515075440-2.png||height="338" width="272"]][[image:image-20220515075625-3.png||height="193" width="257"]]
224
225
226 == Battery Life Analyze ==
227
228 Dragino battery-powered products are all run in Low Power mode. User can check the guideline from this link to calculate the estimated battery life:
229 https:~/~/www.dragino.com/downloads/downloads/LoRa_End_Node/Battery_Analyze/DRAGINO_Battery_Life_Guide.pdf
230
231
Edwin Chen 2.1 232 = Order Info =
233
Edwin Chen 14.1 234 Part Number: (% class="mark" %)**LHT65N-XX**
Edwin Chen 2.1 235
236 **XX**: The default frequency band
237
238 * **AS923**: LoRaWAN AS923 band
239 * **AU915**: LoRaWAN AU915 band
240 * **EU433**: LoRaWAN EU433 band
241 * **EU868**: LoRaWAN EU868 band
242 * **KR920**: LoRaWAN KR920 band
243 * **US915**: LoRaWAN US915 band
244 * **IN865**: LoRaWAN IN865 band
245 * **CN470**: LoRaWAN CN470 band
Edwin Chen 4.1 246
Edwin Chen 14.1 247 **YY**: Sensor Accessories
248
249 * **E3**: External Temperature Probe
250
Edwin Chen 4.1 251 = Packing Info =
252
253 **Package Includes**:
254
255 * LHT65N Temperature & Humidity Sensor x 1
256 * Program cable x 1
257 * Optional external sensor
258
259 **Dimension and weight**:
260
261 * Device Size:  13.5 x 7 x 3 cm
262 * Device Weight: 105g
263 * Package Size / pcs : 14.5 x 8 x 5 cm
264 * Weight / pcs : 170g
265
Edwin Chen 7.1 266 = FCC Warning =
267
268 This device complies with part 15 of the FCC Rules.Operation is subject to the following two conditions:
269
270 (1) This device may not cause harmful interference, and
271
272 (2) this device must accept any interference received, including interference that may cause undesired operation