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Version 19.1 by Edwin Chen on 2022/05/15 12:51
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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"]]
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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**(%%)**.**
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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.
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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.
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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.
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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.
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85
Edwin Chen 19.1 86 == LED Indicator ==
Edwin Chen 18.1 87
Edwin Chen 19.1 88 The LHT65N has a triple color LED which for easy shows different stage.
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90 While pressing ACT button, the LED will work as per LED status with ACT button.
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92 In a normal working state:
93
94 * For each uplink, the BLUE LED or RED LED will blink once.
95 * BLUE LED when an external sensor is connected
96 * RED LED when an external sensor is not connected
97 * For each success downlink, the PURPLE LED will blink once
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99
Edwin Chen 14.1 100 = Sensors & Accessories =
101
Edwin Chen 15.1 102 == E3 Temperature Probe ==
Edwin Chen 14.1 103
104 [[image:image-20220515080154-4.png||height="182" width="161"]] [[image:image-20220515080330-5.png||height="201" width="195"]]
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106
107 With Temperature sensor with 2 meters cable long
108
109 * Resolution: 0.0625 °C
110 * ±0.5°C accuracy from -10°C to +85°C
111 * ±2°C accuracy from -55°C to +125°C
112 * Operating Range: -40 ~~ 125 °C
113 * -55°C to 125°C
114 * Working voltage 2.35v ~~ 5v
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116
Edwin Chen 11.1 117 = Battery & How to replace =
118
119 == Battery Type ==
120
121 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.
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123 The discharge curve is not linear so can’t simply use percentage to show the battery level. Below is the battery performance.
Edwin Chen 14.1 124 [[image:image-20220515075034-1.png||height="208" width="644"]]
Edwin Chen 11.1 125
126
127 The minimum Working Voltage for the LHT65N is ~~ 2.5v. When battery is lower than 2.6v, it is time to change the battery.
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129
130 == Replace Battery ==
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132 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.
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134 [[image:image-20220515075440-2.png||height="338" width="272"]][[image:image-20220515075625-3.png||height="193" width="257"]]
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136
137 == Battery Life Analyze ==
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139 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:
140 https:~/~/www.dragino.com/downloads/downloads/LoRa_End_Node/Battery_Analyze/DRAGINO_Battery_Life_Guide.pdf
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142
Edwin Chen 2.1 143 = Order Info =
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Edwin Chen 14.1 145 Part Number: (% class="mark" %)**LHT65N-XX**
Edwin Chen 2.1 146
147 **XX**: The default frequency band
148
149 * **AS923**: LoRaWAN AS923 band
150 * **AU915**: LoRaWAN AU915 band
151 * **EU433**: LoRaWAN EU433 band
152 * **EU868**: LoRaWAN EU868 band
153 * **KR920**: LoRaWAN KR920 band
154 * **US915**: LoRaWAN US915 band
155 * **IN865**: LoRaWAN IN865 band
156 * **CN470**: LoRaWAN CN470 band
Edwin Chen 4.1 157
Edwin Chen 14.1 158 **YY**: Sensor Accessories
159
160 * **E3**: External Temperature Probe
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Edwin Chen 4.1 162 = Packing Info =
163
164 **Package Includes**:
165
166 * LHT65N Temperature & Humidity Sensor x 1
167 * Program cable x 1
168 * Optional external sensor
169
170 **Dimension and weight**:
171
172 * Device Size:  13.5 x 7 x 3 cm
173 * Device Weight: 105g
174 * Package Size / pcs : 14.5 x 8 x 5 cm
175 * Weight / pcs : 170g
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Edwin Chen 7.1 177 = FCC Warning =
178
179 This device complies with part 15 of the FCC Rules.Operation is subject to the following two conditions:
180
181 (1) This device may not cause harmful interference, and
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183 (2) this device must accept any interference received, including interference that may cause undesired operation