Changes for page LHT52 - LoRaWAN Temperature & Humidity Sensor User Manual

Last modified by Mengting Qiu on 2024/04/30 14:27

From version < 55.1 >

edited by Xiaoling
on 2022/05/23 11:22

To version < 56.3 >

edited by Xiaoling
on 2022/05/23 11:59

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@@ -1,33 +1,47 @@
--{{box cssClass="floatinginfobox" title="**Contents**"}}
--{{toc/}}
--{{/box}}
++(% style="text-align:center" %)
++[[image:image-20220523115324-1.jpeg||height="500" width="500"]]
--(% class="wikigeneratedid" %)
--=   =
--(% class="wikigeneratedid" %)
--= 1.Introduction =
++**LHT65N LoRaWAN Temperature & Humidity Sensor Manual**
--== 1.1 Overview ==
--[[image:LHT65N_10.png||alt="LHT65_Image" height="265" width="265"]]
++**Table of Contents：**
--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**(%%)**.**
++{{toc/}}
++
++
++= 1.Introduction =
++
++== 1.1 What is LHT65N Temperature & Humidity Sensor ==
++
++(((
++The Dragino LHT65N Temperature & Humidity sensor is a Long Range LoRaWAN Sensor. It includes a (% style="color:#4f81bd" %)**built-in Temperature & Humidity sensor**(%%) and has an external sensor connector to connect to an external (% style="color:#4f81bd" %)**Temperature Sensor**(%%)**.**
++)))
++
++(((
  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.
++)))
++(((
  LHT65N has a built-in 2400mAh non-chargeable battery which can be used for up to 10 years*.
++)))
++(((
  LHT65N is full compatible with LoRaWAN v1.0.3 Class A protocol, it can work with a standard LoRaWAN gateway.
++)))
--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.
++(((
++LHT65N supports (% style="color:#4f81bd" %)**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.
++)))
++(((
  *The actual battery life depends on how often to send data, please see the battery analyzer chapter.
++)))
++== 1.2 Features ==
--== Features: ==
--
  * Wall mountable
  * LoRaWAN v1.0.3 Class A protocol
  * Frequency Bands: CN470/EU433/KR920/US915/EU868/AS923/AU915
@@ -40,32 +40,62 @@
  * Tri-color LED to indicate working status
  * Datalog feature
--== Specification: ==
++== 1.3 Specification ==
++(((
  **Built-in Temperature Sensor:**
++)))
--* Resolution: 0.01 °C
--* Accuracy Tolerance : Typ ±0.3 °C
--* Long Term Drift: < 0.02 °C/yr
--* Operating Range: -40 ~~ 85 °C
++* (((
++Resolution: 0.01 °C
++)))
++* (((
++Accuracy Tolerance : Typ ±0.3 °C
++)))
++* (((
++Long Term Drift: < 0.02 °C/yr
++)))
++* (((
++Operating Range: -40 ~~ 85 °C
++)))
++(((
  **Built-in Humidity Sensor:**
++)))
--* Resolution: 0.04 %RH
--* Accuracy Tolerance : Typ ±3 %RH
--* Long Term Drift: < 0.02 °C/yr
--* Operating Range: 0 ~~ 96 %RH
++* (((
++Resolution: 0.04 %RH
++)))
++* (((
++Accuracy Tolerance : Typ ±3 %RH
++)))
++* (((
++Long Term Drift: < 0.02 °C/yr
++)))
++* (((
++Operating Range: 0 ~~ 96 %RH
++)))
++(((
  **External Temperature Sensor:**
++)))
--* Resolution: 0.0625 °C
--* ±0.5°C accuracy from -10°C to +85°C
--* ±2°C accuracy from -55°C to +125°C
--* Operating Range: -55 °C ~~ 125 °C
++* (((
++Resolution: 0.0625 °C
++)))
++* (((
++±0.5°C accuracy from -10°C to +85°C
++)))
++* (((
++±2°C accuracy from -55°C to +125°C
++)))
++* (((
++Operating Range: -55 °C ~~ 125 °C
++)))
--= Connect LHT65N to IoT Server =
++= 2. Connect LHT65N to IoT Server =
--== How does LHT65N work? ==
++== 2.1 How does LHT65N work? ==
  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.
@@ -72,7 +72,7 @@
  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.
--== How to Activate LHT65N? ==
++== 2.2 How to Activate LHT65N? ==
  The LHT65N has two working modes:
@@ -83,12 +83,13 @@
  [[image:image-20220515123819-1.png||height="379" width="317"]]
++(% border="1" %)
  |**Behavior on ACT**|**Function**|**Action**
  |**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.
  |**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.
  |**Fast press ACT 5 times**|Deactivate Device|red led will solid on for 5 seconds. This means LHT65N is in Deep Sleep Mode.
--== Example to join LoRaWAN network ==
++== 2.3 Example to join LoRaWAN network ==
  (% class="wikigeneratedid" %)
  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.
@@ -99,7 +99,7 @@
  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:
--=== **Step 1**: Create Device n TTN ===
++=== 2.3.1 Step 1: Create Device n TTN ===
  Create a device in TTN V3 with the OTAA keys from LHT65N.
@@ -129,7 +129,7 @@
  [[image:image-20220522233118-7.png]]
--=== Step 2: Activate LHT65N by pressing the ACT button for more than 5 seconds. ===
++=== 2.3.2 Step 2: Activate LHT65N by pressing the ACT button for more than 5 seconds. ===
  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.
@@ -136,7 +136,7 @@
  [[image:image-20220522233300-8.png]]
--== Uplink Payload: ==
++== 2.4 Uplink Payload ==
  The uplink payload includes totally 11 bytes. Uplink packets use FPORT=2 and(% class="mark" %) every 20 minutes(%%) send one uplink by default.
@@ -143,7 +143,7 @@
  After each uplink, the (% class="mark" %)BLUE LED(%%) will blink once.
--(% style="width:572px" %)
++(% border="1" style="width:572px" %)
  |(% 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**
  |(% style="width:106px" %)**Value**|(% style="width:71px" %)[[BAT>>path:#Battery]]|(% style="width:128px" %)(((
  [[Built-In>>path:#SHT20_Temperature]]
@@ -159,7 +159,7 @@
  * The 7th byte (EXT #): defines the external sensor model.
  * 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.)
--=== Decoder in TTN V3 ===
++=== 2.4.1 Decoder in TTN V3 ===
  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.
@@ -170,7 +170,7 @@
  [[image:image-20220522234118-10.png]]
--=== BAT-Battery Info ===
++=== 2.4.2 BAT-Battery Info ===
  These two bytes of BAT include the battery state and the actually voltage
@@ -195,7 +195,7 @@
  * BAT status=(0Xcba4>>14)&0xFF=11(B)，very good
  * Battery Voltage =0xCBF6&0x3FFF=0x0BA4=2980mV
--=== Built-in Temperature ===
++=== 2.4.3 Built-in Temperature ===
  [[image:image-20220522235639-2.png]]
@@ -205,13 +205,13 @@
  * Temperature:  (0xF5C6-65536)/100=-26.18℃
--=== Built-in Humidity ===
++=== 2.4.4 Built-in Humidity ===
  [[image:image-20220522235639-4.png]]
  * Humidity:    0x025C/10=60.4%
--=== Ext # ===
++=== 2.4.5 Ext # ===
  Bytes for External Sensor:
@@ -220,19 +220,16 @@
  |(% style="width:139px" %)0x01|(% style="width:484px" %)Sensor E3, Temperature Sensor
  |(% style="width:139px" %)0x09|(% style="width:484px" %)Sensor E3, Temperature Sensor, Datalog Mod
--=== Ext value ===
++=== 2.4.6 Ext value ===
--==== Ext~=1, E3 Temperature Sensor ====
++==== 2.4.6.1 Ext~=1, E3 Temperature Sensor ====
  [[image:image-20220522235639-5.png]]
--
  * DS18B20 temp=0x0ADD/100=27.81℃
  The last 2 bytes of data are meaningless
--
--
  [[image:image-20220522235639-6.png]]
  * External temperature= (0xF54F-65536)/100=-27.37℃
@@ -239,16 +239,15 @@
  The last 2 bytes of data are meaningless
--
  If the external sensor is 0x01, and there is no external temperature connected. The temperature will be set to 7FFF which is 327.67℃
--==== Ext~=9, E3 sensor with Unix Timestamp ====
++==== 2.4.6.2 Ext~=9, E3 sensor with Unix Timestamp ====
  Timestamp mode is designed for LHT65N with E3 probe, it will send the uplink payload with Unix timestamp. With the limitation of 11 bytes (max distance of AU915/US915/AS923 band), the time stamp mode will be lack of BAT voltage field, instead, it shows the battery status. The payload is as below:
--(% style="width:697px" %)
++(% border="1" style="width:697px" %)
  |(% style="width:96px" %)**Size(bytes)**|(% style="width:164px" %)**2**|(% style="width:104px" %)**2**|(% style="width:106px" %)**2**|(% style="width:108px" %)**1**|(% style="width:116px" %)**4**
  |(% style="width:96px" %)**Value**|(% style="width:164px" %)[[External temperature>>path:#DS18b20_value]]|(% style="width:104px" %)(((
  [[Built-In>>path:#SHT20_Temperature]]
@@ -266,9 +266,9 @@
  [[Time Stamp>>path:#Unix_Time_Stamp]]
  )))
--* **Battery status & **[[(% class="wikiinternallink wikiinternallink wikiinternallink wikiinternallink" %)**Built-in Humidity**>>path:#SHT20_Humidity]]
++* **Battery status & **[[(% class="wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink" %)**Built-in Humidity**>>path:#SHT20_Humidity]]
--(% style="width:587px" %)
++(% border="1" style="width:587px" %)
  |Bit(bit)|(% style="width:280px" %)[15:14]|(% style="width:136px" %)[11:0]
  |Value|(% style="width:280px" %)(((
  BAT Status
@@ -288,7 +288,7 @@
  * **Status & Ext Byte**
--(% style="width:732px" %)
++(% border="1" style="width:732px" %)
  |(% style="width:128px" %)**Bits**|(% style="width:102px" %)**7**|(% style="width:145px" %)**6**|(% style="width:117px" %)**5**|(% style="width:147px" %)**4**|(% style="width:90px" %)**[3:0]**
  |(% style="width:128px" %)**Status & Ext**|(% style="width:102px" %)Not Defined|(% style="width:145px" %)Poll Message Flag|(% style="width:117px" %)Sync time OK|(% style="width:147px" %)Unix Time Request|(% style="width:90px" %)(((
  Ext:
@@ -300,11 +300,10 @@
  * Sync time OK: 1: Set time ok，0: N/A. After time SYNC request is sent, LHT65N will set this bit to 0 until got the time stamp from the application server.
  * Unix Time Request:1: Request server downlink Unix time, 0 : N/A. In this mode, LHT65N will set this bit to 1 every 10 days to request a time SYNC. (AT+SYNCMOD to set this)
--== Show data on Datacake ==
++== 2.5 Show data on Datacake ==
  Datacake IoT platform provides a human-friendly interface to show the sensor data, once we have sensor data in TTN V3, we can use Datacake to connect to TTN V3 and see the data in Datacake. Below are the steps:
--
  **Step 1**: Be sure that your device is programmed and properly connected to the LoRaWAN network.
  **Step 2**: Configure your Application to forward data to Datacake you will need to add integration. Go to TTN V3 Console ~-~-> Applications ~-~-> Integrations ~-~-> Add Integrations.
@@ -329,11 +329,11 @@
  [[image:image-20220523000825-10.png||height="432" width="762"]]
--== Datalog Feature ==
++== 2.6 Datalog Feature ==
  This feature is always enabled. When user wants to retrieve the sensor value, he can send a poll command from the IoT platform to ask LHT65N to send the value in the required time slot.
--=== Unix TimeStamp ===
++=== 2.6.1 Unix TimeStamp ===
  LHT65N uses Unix TimeStamp format based on
@@ -344,12 +344,12 @@
  Below is the converter example
--[[image:image-20220523001219-12.png||height="353" width="853"]]
++[[image:image-20220523001219-12.png||height="302" width="730"]]
  So, we can use AT+TIMESTAMP=1611889405 or downlink 3060137afd00 to set the current time 2021 – Jan ~-~- 29 Friday 03:03:25
--=== Set Device Time ===
++=== 2.6.2 Set Device Time ===
  There are two ways to set device’s time:
@@ -367,12 +367,12 @@
  User needs to set SYNCMOD=0 to manual time, otherwise, the user set time will be overwritten by the time set by the server.
--=== Poll sensor value ===
++=== 2.6.3 Poll sensor value ===
  User can poll sensor value based on timestamps from the server. Below is the downlink command.
--(% style="width:454px" %)
++(% border="1" style="width:454px" %)
  |(% style="width:69px" %)1byte|(% style="width:129px" %)4bytes|(% style="width:134px" %)4bytes|(% style="width:119px" %)1byte
  |(% style="width:69px" %)31|(% style="width:129px" %)Timestamp start|(% style="width:134px" %)Timestamp end|(% style="width:119px" %)Uplink Interval
@@ -386,7 +386,7 @@
  Uplink Internal =5s，means LHT65N will send one packet every 5s. range 5~~255s.
--=== Datalog Uplink payload ===
++=== 2.6.4 Datalog Uplink payload ===
  The Datalog poll reply uplink will use below payload format.
@@ -393,6 +393,7 @@
  Retrieval data payload
++(% border="1" %)
  |**Size(bytes)**|**2**|**2**|**2**|**1**|**4**
  |**Value**|[[External sensor data>>path:#Extension_sensor_value]]|(((
  [[Built-In>>path:#SHT20_Temperature]]
@@ -411,6 +411,7 @@
  Poll message flag & Ext
++(% border="1" %)
  |**Bits**|**7**|**6**|**5**|**4**|**[3:0]**
  |**Status & Ext**|Not Defined|Poll Message Flag|Sync time OK|Unix Time Request|(((
  Ext:
@@ -470,7 +470,7 @@
  LHT65N will uplink this payload.
--[[image:image-20220523001219-13.png]]
++[[image:image-20220523001219-13.png||height="421" width="727"]]
 FFF089801464160065F977FFF088E014B41600660097FFF0885014E41600660667FFF0875015141600662BE7FFF086B015541600665167FFF08660155416006676E7FFF085F015A41600669C67FFF0857015D4160066C1E
@@ -489,7 +489,7 @@
  Unix time is 0x60065F97=1611030423s=21/1/19 04:27:03
--== Alarm Mode ==
++== 2.7 Alarm Mode ==
  Alarm mode feature is added since firmware v1.5. When device is in Alarm mode, it will check the built-in sensor temperature in a short interval. If the temperature exceeds the pre-configure range, it will send an uplink immediately.
@@ -505,7 +505,7 @@
--== LED Indicator ==
++== 2.8 LED Indicator ==
  The LHT65N has a triple color LED which for easy shows different stage.
@@ -520,17 +520,14 @@
  ----
--== Installation ==
++== 2.9 Installation ==
  [[image:image-20220516231650-1.png||height="436" width="428"]]
++= 3. Sensors & Accessories =
++== 3.1 E3 Temperature Probe ==
--
--= Sensors & Accessories =
--
--== E3 Temperature Probe ==
--
  [[image:image-20220515080154-4.png||height="182" width="161"]]              [[image:image-20220515080330-5.png||height="201" width="195"]]
@@ -543,7 +543,7 @@
  * -55°C to 125°C
  * Working voltage 2.35v ~~ 5v
--= Configure LHT65N via AT Command or LoRaWAN Downlink =
++= 4. Configure LHT65N via AT Command or LoRaWAN Downlink =
  Use can configure LHT65N via AT Command or LoRaWAN Downlink.
@@ -552,7 +552,6 @@
  [[http:~~/~~/wiki.dragino.com/index.php?title=Main_Page#Use_Note_for_Server>>url:http://wiki.dragino.com/index.php?title=Main_Page#Use_Note_for_Server]]
--
  There are two kinds of commands to configure LHT65N, they are:
  * **General Commands**.
@@ -566,19 +566,17 @@
  [[http:~~/~~/wiki.dragino.com/index.php?title=End_Device_Downlink_Command>>url:http://wiki.dragino.com/index.php?title=End_Device_Downlink_Command]]
--
--
  * **Commands special design for LHT65N**
  These commands are only valid for LHT65N, as below:
++== 4.1 Set Transmit Interval Time ==
--== Set Transmit Interval Time ==
--
  Feature: Change LoRaWAN End Node Transmit Interval.
  **AT Command: AT+TDC**
++(% border="1" %)
  |**Command Example**|**Function**|**Response**
  |AT+TDC?|Show current transmit Interval|(((
@@ -602,12 +602,13 @@
  * Example 1: Downlink Payload: 0100001E ~/~/ Set Transmit Interval (TDC) = 30 seconds
  * Example 2: Downlink Payload: 0100003C ~/~/ Set Transmit Interval (TDC) = 60 seconds
--== Set External Sensor Mode ==
++== 4.2 Set External Sensor Mode ==
  Feature: Change External Sensor Mode.
  **AT Command: AT+EXT**
++(% border="1" %)
  |**Command Example**|**Function**|**Response**
  |AT+EXT?|Get current external sensor mode|(((
@@ -629,7 +629,7 @@
  * 0xA209: Same as AT+EXT=9
  * 0xA20702003c,Same as AT+SETCNT=60
--== Enable/Disable uplink Temperature probe ID ==
++== 4.3 Enable/Disable uplink Temperature probe ID ==
  Feature: If PID is enabled, device will send the temperature probe ID on:
@@ -641,6 +641,7 @@
  **AT Command:**
++(% border="1" %)
  |**Command Example**|**Function**|**Response**
  |AT+PID=1|Enable PID uplink|OK
@@ -649,13 +649,13 @@
  * 0xA800     à AT+PID=0
  * 0xA801     à AT+PID=1
++== 4.4 Set Password ==
--== Set Password ==
--
  Feature: Set device password, max 9 digits
  **AT Command: AT+PWORD**
++(% border="1" %)
  |**Command Example**|**Function**|**Response**
  |AT+PWORD=?|Show password|(((
@@ -669,13 +669,13 @@
  No downlink command for this feature.
++== 4.5 Quit AT Command ==
--== Quit AT Command ==
--
  Feature: Quit AT Command mode, so user needs to input password again before use AT Commands.
  **AT Command: AT+DISAT**
++(% border="1" %)
  |**Command Example**|**Function**|**Response**
  |AT+DISAT|Quit AT Commands mode|OK
@@ -684,12 +684,13 @@
  No downlink command for this feature.
--== Set to sleep mode ==
++== 4.6 Set to sleep mode ==
  Feature: Set device to sleep mode
  **AT Command: AT+SLEEP**
++(% border="1" %)
  | | |
  |**Command Example**|**Function**|**Response**
  |AT+SLEEP|Set to sleep mode|(((
@@ -702,13 +702,13 @@
  * There is no downlink command to set to Sleep mode.
++== 4.7 Set system time ==
--== Set system time ==
--
  Feature: Set system time, unix format. [[See here for format detail.>>path:#TimeStamp]]
  **AT Command:**
++(% border="1" %)
  |**Command Example**|**Function**
  |AT+TIMESTAMP=1611104352|(((
  OK
@@ -720,12 +720,10 @@
 x306007806000 ~/~/ Set timestamp to 0x(6007806000),Same as AT+TIMESTAMP=1611104352
++== 4.8 Set Time Sync Mode ==
--== Set Time Sync Mode ==
--
  Feature: Enable/Disable Sync system time via LoRaWAN MAC Command (DeviceTimeReq), LoRaWAN server must support v1.0.3 protocol to reply this command.
--
  SYNCMOD is set to 1 by default. If user want to set a different time from LoRaWAN server, user need to set this to 0.
@@ -740,13 +740,13 @@
 x28 00 ~/~/ Same As AT+SYNCMOD=0
++== 4.9 Set Time Sync Interval ==
--== Set Time Sync Interval ==
--
  Feature: Define System time sync interval. SYNCTDC default value: 10 days.
  **AT Command:**
++(% border="1" %)
  |**Command Example**|**Function**
  |AT+SYNCTDC=0x0A|Set SYNCTDC to 10 (0x0A), so the sync time is 10 days.
@@ -754,13 +754,13 @@
 x29 0A ~/~/ Same as AT+SYNCTDC=0x0A
++== 4.10 Print data entries base on page. ==
--== Print data entries base on page. ==
--
  Feature: Print the sector data from start page to stop page (max is 416 pages).
  **AT Command: AT+PDTA**
++(% border="1" %)
  |**Command Example**|**Response**
  |(((
  AT+PDTA=1,3
@@ -809,14 +809,13 @@
  No downlink commands for feature
++== 4.11 Print last few data entries. ==
--
--== Print last few data entries. ==
--
  Feature: Print the last few data entries
  **AT Command: AT+PLDTA**
++(% border="1" %)
  |**Command Example**|**Response**
  |(((
  AT+PLDTA=5
@@ -846,14 +846,13 @@
  No downlink commands for feature
++== 4.12 Clear Flash Record ==
--
--== Clear Flash Record ==
--
  Feature: Clear flash storage for data log feature.
  **AT Command: AT+CLRDTA**
++(% border="1" %)
  |**Command Example**|**Function**|**Response**
  |AT+CLRDTA|Clear date record|(((
  Clear all stored sensor data…
@@ -865,36 +865,31 @@
  * Example: 0xA301   ~/~/Same as AT+CLRDTA
++= 5. Battery & How to replace =
++== 5.1 Battery Type ==
--= Battery & How to replace =
--
--== Battery Type ==
--
  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.
  The discharge curve is not linear so can’t simply use percentage to show the battery level. Below is the battery performance.
  [[image:image-20220515075034-1.png||height="208" width="644"]]
--
  The minimum Working Voltage for the LHT65N is ~~ 2.5v. When battery is lower than 2.6v, it is time to change the battery.
--== Replace Battery ==
++== 5.2 Replace Battery ==
  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.
  [[image:image-20220515075440-2.png||height="338" width="272"]][[image:image-20220515075625-3.png||height="193" width="257"]]
++== 5.3 Battery Life Analyze ==
--== Battery Life Analyze ==
--
  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:
  https:~/~/www.dragino.com/downloads/downloads/LoRa_End_Node/Battery_Analyze/DRAGINO_Battery_Life_Guide.pdf
++= 6. Order Info =
--= Order Info =
--
  Part Number: (% class="mark" %)**LHT65N-XX**
  **XX**: The default frequency band
@@ -912,7 +912,7 @@
  * **E3**: External Temperature Probe
--= Packing Info =
++= 7. Packing Info =
  **Package Includes**:
@@ -927,10 +927,10 @@
  * Package Size / pcs : 14.5 x 8 x 5 cm
  * Weight / pcs : 170g
--= FCC Warning =
++= 8. FCC Warning =
  This device complies with part 15 of the FCC Rules.Operation is subject to the following two conditions:
--(1) This device may not cause harmful interference, and
++(1) This device may not cause harmful interference；
--(2) this device must accept any interference received, including interference that may cause undesired operation
++(2) this device must accept any interference received, including interference that may cause undesired operation.

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Changes for page LHT52 - LoRaWAN Temperature & Humidity Sensor User Manual

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