1655774244188-589.png

Table of Contents:

1.  Introduction

1.1  What is LHT52 Temperature & Humidity Sensor

 

The Dragino LHT52 Temperature & Humidity sensor is a Long Range LoRaWAN Sensor. It includes a built-in Temperature & Humidity sensor and has a USB Type-C sensor connector to connect to external sensors such as external Temperature Sensor.

LHT52 senses environment temperature and humidity and send these values via long-range wireless LoRaWAN protocol. It targets professional wireless sensor network applications such as food service, smart metering, smart cities, building automation, and so on.

LHT52 supports 2 x AAA batteries and works for a long time up to several years. Use can replace the batteries easily after they are finished.

LHT52 is fully compatible with LoRaWAN v1.0.3 protocol, it can work with standard LoRaWAN gateway.

LHT52 supports Datalog feature to make sure users won’t miss sensor data. It records sensor value for every uplink. These values can be retrieved by LoRaWAN server via downlink command.

LHT52 supports temperature alarm feature. It can uplink alarm in a short interval while temperature exceeds preset limits.

*Battery life depends how often to send data, please see battery analyzer.

1655774519494-861.png

 

1.2  Features

  • Wall Attachable.
  • LoRaWAN v1.0.3 Class A protocol.
  • Built-in Temperature & Humidity sensor
  • Optional External Probe
  • Frequency Bands: CN470/EU433/KR920/US915/EU868/AS923/AU915
  • AT Commands to change parameters
  • Remote configure parameters via LoRaWAN Downlink
  • Firmware upgradable via program port
  • Support 2 x AAA LR03 batteries.
  • Datalog feature
  • IP Rating: IP52

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: -20 ~ 50 °C

Built-in Humidity Sensor:

  • Resolution: 0.1 %RH
  • Accuracy Tolerance: Typ ±3 %RH
  • Long Term Drift: < 0.02 °C/yr
  • Operating Range: 0 ~ 99.0 %RH(no Dew)

1.4  Power Consumption

LHT52 (without external sensor): Idle: 5uA, Transmit: max 110mA

LHT52 + External Temperature Probe (AS-01): Idle: 6uA, Transmit: max 110mA.

1.5  Storage & Operation Temperature

-20°C to +50°C

1.6  Applications

  • Smart Buildings & Home Automation
  • Logistics and Supply Chain Management
  • Smart Metering
  • Smart Agriculture
  • Smart Cities
  • Smart Factory

2.  Operation Mode

2.1  How it work?

Each LHT52 is shipped with a worldwide unique set of LoRaWAN OTAA keys. To use LHT52 in a LoRaWAN network, user needs to input the OTAA keys in LoRaWAN network server. After this, if LHT52 is under this LoRaWAN network coverage, LHT52 can join the LoRaWAN network and start to transmit sensor data. The default period for each uplink is 20 minutes.

2.2  How to Activate LHT52?

 1.  Open enclosure from below position.

image-20220621093835-1.png

 2.  Insert 2 x AAA LR03 batteries.

image-20220621093835-2.png

 3.  Press the reset button to activate device.

image-20220621093835-3.png  

User can check LED Status to know the working state of LHT52.

2.3  Example to join LoRaWAN network

This section shows an example for how to join the TheThingsNetwork LoRaWAN IoT server. Usages with other LoRaWAN IoT servers are of similar procedure.

1655775912928-657.png

Assume the DLOS8 is already set to connect to TTN V3 network . We need to add the LHT52 device in TTN V3 portal.  

Step 1:  Create a device in TTN V3 with the OTAA keys from LHT52.

Each LHT52 is shipped with a sticker with the default DEV EUI as below:

image-20220617150003-1.jpeg

Enter these keys in the LoRaWAN Server portal. Below is TTN V3 screen shot:

Add APP EUI in the application.

choose to create the device manually.

Add APP KEY and DEV EUI

image-20220522232916-3.png

1655776122894-257.png

Default mode OTAA

1655776241177-240.png

Step 2:  Use ACT button to activate LHT52 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.

image-20220621095134-4.png

2.4  Uplink Payload

Uplink payloads include two types: Valid Sensor Value and other status / control command.

  • Valid Sensor Value: Use FPORT=2
  • Other control command: Use FPORT other than 2.

2.4.1  Uplink FPORT=5, Device Status

Uplink the device configures with FPORT=5. Once LHT52 Joined the network, it will uplink this message to the server. After first uplink, LHT52 will uplink Device Status every 12 hours.

Size (bytes)12112
ValueSensor ModelFirmware VersionFrequency BandSub-bandBAT

image-20220621100550-5.png

Example Payload (FPort=5):  image-20220621105116-11.png

Sensor Model: For LHT52, this value is 0x09.

Firmware Version: 0x0100, Means: v1.0.0 version.

Frequency Band:

*0x01: EU868

*0x02: US915

*0x03: IN865

*0x04: AU915

*0x05: KZ865

*0x06: RU864

*0x07: AS923

*0x08: AS923-1

*0x09: AS923-2

*0x0a: AS923-3

Sub-Band: value 0x00 ~ 0x08(only for CN470, AU915,US915. Others are0x00)

BAT: shows the battery voltage for LHT52.

Ex1: 0x0B3A = 2874mV

Use can also get the Device Status uplink through the downlink command:

Downlink:  0x2301

image-20220621100550-6.png

2.4.2  Uplink FPORT=2, Real time sensor value

LHT52 will send this uplink after Device Status uplink once join LoRaWAN network successfully. And it will periodically send this uplink. Default interval is 20 minutes and can be changed.

Uplink uses FPORT=2 and every 20 minutes send one uplink by default.

Size(bytes)

2

2

2

1

4

Value

Ext #

Temperature:

image-20220621101526-7.png

Example Payload (FPort=2):

08 CD 02 20 7F FF 01 61 CD 4E DD

Temperature & External Temperature:

  • Example1:  0x08CD/100=22.53℃
  • Example2:  (0xF5C6-65536)/100=-26.18℃

Humidity:

  • Humidity:    0x0220/10=54.4%

Extension #

Bytes for External Sensor:

EXT # ValueExternal Sensor Probe
0x01Sensor AS-01, Temperature

2.4.3  Uplink FPORT=3, Datalog sensor value

LHT52 stores sensor value and user can retrieve these history value via downlink command. The Datalog sensor value are sent via FPORT=3.

image-20220621101659-8.png

  • Each data entry is 11 bytes, to save airtime and battery, LHT52 will send max bytes according to the current DR and Frequency bands.

For example, in US915 band, the max payload for different DR is:

  1. DR0: max is 11 bytes so one entry of data
  2. DR1: max is 53 bytes so devices will upload 4 entries of data (total 44 bytes)
  3. DR2: total payload includes 11 entries of data
  4. DR3: total payload includes 22 entries of data.

Notice: LHT52 will save 178 set of history data, If device doesn't have any data in the polling time. Device will uplink 11 bytes of 0.

See more info about the Datalog feature.

2.4.4  Uplink FPORT=4, DS18B20 ID

User can get external DS18B20 ID through the downlink command.

Downlink:0x2302

image-20220621101853-9.png

Example Payload (FPort=4):

28 86 63 B2 00 00 00 9F

The External DS18B20 ID is 0x28 86 63 B2 00 00 00 9F

2.4.5  Decoder in TTN V3

In LoRaWAN protocol, the uplink payload is HEX format, user need to add a payload formatter/decoder in LoRaWAN Server to get human friendly string.

In TTN , add formatter as below: 

image-20220621102026-10.png

Please check the decoder from this link:

https://www.dragino.com/downloads/index.php?dir=LoRa_End_Node/LHT52/Decoder/

2.5 Show data on Datacake

Datacake IoT platform provides a human friendly interface to show the sensor data in charts, 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.

  1. Add Datacake:

2. Select default key as Access Key:

3. In Datacake console (https://datacake.co/) , add LHT52:

 Please refer to the figure below

image-20220621112422-1.png

Log in to DATACAKE, copy the API under the accountimage-20220621112422-2.png

image-20220621112422-3.png

image-20220621112422-4.png

image-20220621112422-5.png

image-20220621112422-6.png

image-20220621112422-7.png

image-20220621112422-8.png

image-20220621112422-9.png

image-20220621112422-10.png

Copy and paste the TTN decoder here and save

image-20220621112422-11.png

Visual widgets please read the DATACAKE documentation

image-20220621112422-12.png

2.6  Datalog Feature

When user want to retrieve sensor value, he can send a poll command from the IoT platform to ask sensor to send value in the required time slot.

2.6.1  Unix TimeStamp

Unix TimeStamp shows the sampling time of uplink payload. format base on

image-20220523001219-11.png

User can get this time from link:  https://www.epochconverter.com/ :

For example: if the Unix Timestamp we got is hex 0x60137afd, we can convert it to Decimal: 1611889405. and then convert to the time: 2021 – Jan -- 29 Friday 03:03:25 (GMT)

1655782409139-256.png

 

2.6.2  Poll sensor value

User can poll sensor value based on timestamps from the server. Below is the downlink command.

image-20220523152302-15.png

Timestamp start and Timestamp end use Unix TimeStamp format as mentioned above. Devices will reply with all data log during this time period, use the uplink interval.

For example, downlink command image-20220621113526-13.png  

Is to check 2020/12/1 07:40:00 to 2020/12/1 08:40:00's data

Uplink Internal =5s,means LHT52 will send one packet every 5s. range 5~255s.

 

2.6.3  Datalog Uplink payload

See Uplink FPORT=3, Datalog sensor value

2.7  Alarm Mode

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.

The alarm mode can be modified by AT command or downlink, Alarm mode is disabled by default.

If you need to enable the Alarm mode, please refer to the following

Note: Alarm mode will increase the power consumption, we recommend extending the normal uplink time (20 minutes default) when enable this feature.

 

AT Commands for Alarm mode:

AT+WMOD=1               Enable/Disable Alarm Mode. (0:Disable, 1: Enable),need to reset the node to take effect

AT+CITEMP=1              The interval to check temperature for Alarm. (Unit: minute)

AT+ARTEMP=-40,125:    Set the normal temperature range from -40°C to 125°C

Suppose you want to set the normal temperature from 15°C to 50°C, and turn on the alarm mode, and check the temperature every 2 minutes. Please refer to the following

image-20220621114109-14.png                

image-20220621114109-15.png

Modification via downlink,Take TTN_V3 as an example(downlink commands, please refer to the downlink command set for details)

In order to ensure that the node is indeed modified by downlink, I reset the node to factory settings first.

image-20220621114109-16.png

image-20220621114109-17.png

image-20220621114109-18.png

Or use a downlink directly: AA010002000F0032 (See command info)

image-20220621114109-19.png

 

2.8 LED Indicator

The LHT52 has a triple color LED which for easy showing different stage.

In a normal working state:

  • When the node is restarted, GREENRED and BLUE are sequentially lit.
  • During OTAA Join:
    • For each Join Request uplink: the GREEN LED will blink once.
    • Once Join Successful: the GREEN LED will be solid on for 5 seconds.
  • After joined, for each uplink, the BLUE LED or GREEN LED will blink once.
    • BLUE LED when external sensor is connected
    • GREEN LED when external sensor is not connected
  • For each success downlink, the PURPLE LED will blink once

In AT Command Mode:

If user use console cable to send AT Command to LHT52, the RED LED will always on until:

  • Power off/on LHT52
  • Press reset button of LHT52.
  • Send an AT Command: AT+CLPM=1

2.9  Button

Press the button LHT52 will reset and join network again.

5.  Sensors and Accessories

5.1  Temperature Probe (AS-01)

External Temperature Probe base on DS18B20. (note: Default Package doesn’t include AS-01)

image-20220621141939-4.png       image-20220621141546-2.png   

External Temperature Probe (AS-01): 

  • 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
  • Cable Length: 2 meters

5.2  Program Converter (AS-02)

AS-02 is an optional accessory, it is USB Type-C converter. AS-02 provide below feature:

  1. Access AT console of LHT52 when used with USB-TTL adapter. See this link.
  2. Update firmware to LHT52 when used with DAP-Link adapter. See this link.

image-20220621141724-3.png

3.  Configure LHT52 via AT command or LoRaWAN downlink

Use can configure LHT52 via AT Command or LoRaWAN Downlink.

 

There are two kinds of commands to configure LHT52, they are:

General Commands.

These commands are to configure:

  • General system settings like: uplink interval.

  • LoRaWAN protocol & radio-related commands.

They are the same for all Dragino Devices which supports DLWS-005 LoRaWAN Stack(Note**). These commands can be found on the wiki: End Device Downlink Command

 

Commands special design for LHT52

These commands are only valid for LHT52, as below:

 

3.1  Set Transmit Interval Time

Command ExampleFunctionResponseDownlink
AT+TDC=?View current TDC time

1200000

OK

Default 1200000(ms)
AT+TDC=300000Set TDC timeOK

0X0100012C:

01:fixed command

00012C:0X00012C=300(seconds)

ATZReset node 0x04FF
AT+FDRRestore factory settings 0X04FE
AT+CFM=?View the current confirmation mode status

0

OK

Default 0
AT+CFM=1Turn on confirmation modeOK

0x0500:close

0x0501:open

05:fixed command

AT+CHE=?View the current sub-band select 0-7, the default is 0

0

OK

Default 0
AT+CHE=2

Set subband to 2

(CN470,US915,AU915)

Attention:Take effect after ATZ

OK

 

0X0702:

07:fixed command

02:Select subband 2

AT+WMOD=?View the current alarm mode status

0

OK

Default 0
AT+WMOD=1Turn on alarm mode

Attention:Take effect after ATZ

OK

 

0xA501:open

0XA500:close

A5:fixed command

 

AT+CITEMP=?View the current temperature detection time interval

1

OK

Default 1(min)
AT+CITEMP=2Set the temperature detection time interval to 2minOK

0XA70002

A7:fixed command

0002:0X0002=2(min)

AT+NJM=?Check the current network connection method

1

OK

Default 1
AT+NJM=0Change the network connection method to ABP

Attention:Take effect after ATZ

OK

 

0X2000:ABP

0x2001:OTAA

20:fixed command

 

AT+RPL=?View current RPL settings

0

OK

Default 0
AT+RPL=1set RPL=1OK

0x2101:

21:fixed command

01:for details, check wiki

AT+ADR=?View current ADR status

1

OK

Default 0
AT+ADR=0Set the ADR state to offOK

0x2200:close

0x2201:open

22:fixed command

AT+DR=?View the current DR settingsOK 
AT+DR=1

set DR to 1

It takes effect only when ADR=0

OK

0X22000101:

00:ADR=0

01:DR=1

01:TXP=1

22:fixed command

AT+TXP=?View the current TXPOK 
AT+TXP=1

set TXP to 1

It takes effect only when ADR=0

OK

0X22000101:

00:ADR=0

01:DR=1

01:TXP=1

22:fixed command

 Upload node configuration or DS18B20 ID 

0X2301:Upload node configuration

0x2302:Upload DS18B20 ID

23:fixed command

AT+DWELL=?Check the high-rate upload settings

1

OK

Default 1
AT+DWELL=1

Set high rate upload

(AS923,AU915)

Attention:Take effect after ATZ

OK

 

0x2501:close

0x2500:open

25:fixed command

for details, check wiki

AT+RJTDC=?View current RJTDC set time

20

OK

Default 20(min)
AT+RJTDC=10Set RJTDC time intervalOK

0X26000A:

26:fixed command

000A:0X000A=10(min)

for details, check wiki

 Retrieve stored data for a specified period of time 

0X3161DE7C7061DE8A800A:

31:fixed command

61DE7C70:0X61DE7C70=2022/1/12 15:00:00

61DE8A80:0X61DE8A80=2022/1/12 16:00:00

0A:0X0A=10(second)

View details 2.6.2

AT+DDETECT=?View the current DDETECT setting status and time

0,1440

OK

Default 0,1440(min)
AT+DDETECT=1,1440

Set DDETECT setting status and time

(When the node does not receive the downlink packet within the set time, it will re-enter the network)

OK

0X320005A0:close

0X320105A0:open

32:fixed command

05A0:0X05A0=1440(min)

 

Downlink Modification Alarm Mode

(AT+WMOD,AT+CITEMP,AT+ARTEMP)

 

0XAA010002000F00032:

AA:fixed command

01:0X01=1(AT+MOD)

0002:0X0002=2(AT+CITEMP)

000F:0X000F=15(AT+ARTEMP)

0032:0X0032=50(AT+ARTEMP)

4.2  Set Password

Feature: Set device password, max 9 digits

AT Command: AT+PWORD

image-20220523151052-5.png

 

Downlink Command:

No downlink command for this feature.

 

5. Battery & How to replace

5.1 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-20220515075034-1.png

The minimum Working Voltage for the LHT65N is ~ 2.5v. When battery is lower than 2.6v, it is time to change the 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-20220515075440-2.pngimage-20220515075625-3.png

5.3 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

 

A full detail test report for LHT65N on different frequency can be found at : https://www.dropbox.com/sh/r2i3zlhsyrpavla/AAB1sZw3mdT0K7XjpHCITt13a?dl=0

6. FAQ

6.1 How to use AT Command?

LHT65N supports AT Command set.User can use a USB to TTL adapter plus the Program Cable to connect to LHT65 for using AT command, as below.

image-20220530085651-1.png

Connection:

✓ USB to TTL GND <-->GND

✓  USB to TTL RXD <--> D+

✓  USB to TTL TXD <--> A11

✓  USB to TTL 3.3V <--> D-

In PC, User needs to set serial tool(such as putty, SecureCRT) baud rate to 9600 to access to access serial console for LHT65N. The AT commands are disable by default and need to enter password (default:123456to active it. Timeout to input AT Command is 5 min, after 5-minute, user need to input password again. User can use AT+DISAT command to disable AT command before timeout.

Input password and ATZ to activate LHT65N,As shown below:

image-20220530095701-4.png

AT Command List is as below:

AT+<CMD>? :                  Help on <CMD>

AT+<CMD> :                   Run <CMD>

AT+<CMD>=<value> :   Set the value

AT+<CMD>=? :               Get the value

AT+DEBUG:    Set more info output

ATZ:                Trig a reset of the MCU

AT+FDR:         Reset Parameters to Factory Default, Keys Reserve

AT+DEUI:       Get or Set the Device EUI

AT+DADDR:   Get or Set the Device Address

AT+APPKEY:   Get or Set the Application Key

AT+NWKSKEY:   Get or Set the Network Session Key

AT+APPSKEY:     Get or Set the Application Session Key

AT+APPEUI:       Get or Set the Application EUI

AT+ADR:       Get or Set the Adaptive Data Rate setting. (0: off, 1: on)

AT+TXP:        Get or Set the Transmit Power (0-5, MAX:0, MIN:5, according to LoRaWAN Spec)

AT+DR:         Get or Set the Data Rate. (0-7 corresponding to DR_X)

AT+DCS:       Get or Set the ETSI Duty Cycle setting - 0=disable, 1=enable - Only for testing

AT+PNM:      Get or Set the public network mode. (0: off, 1: on)

AT+RX2FQ:    Get or Set the Rx2 window frequency

AT+RX2DR:    Get or Set the Rx2 window data rate (0-7 corresponding to DR_X)

AT+RX1DL:    Get or Set the delay between the end of the Tx and the Rx Window 1 in ms

AT+RX2DL:    Get or Set the delay between the end of the Tx and the Rx Window 2 in ms

AT+JN1DL:     Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 1 in ms

AT+JN2DL:     Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 2 in ms

AT+NJM:        Get or Set the Network Join Mode. (0: ABP, 1: OTAA)

AT+NWKID:    Get or Set the Network ID

AT+FCU:        Get or Set the Frame Counter Uplink

AT+FCD:        Get or Set the Frame Counter Downlink

AT+CLASS:    Get or Set the Device Class

AT+JOIN:       Join network

AT+NJS:        Get the join status

AT+SENDB:   Send hexadecimal data along with the application port

AT+SEND:     Send text data along with the application port

AT+RECVB:    Print last received data in binary format (with hexadecimal values)

AT+RECV:      Print last received data in raw format

AT+VER:        Get current image version and Frequency Band

AT+CFM:       Get or Set the confirmation mode (0-1)

AT+CFS:        Get confirmation status of the last AT+SEND (0-1)

AT+SNR:       Get the SNR of the last received packet

AT+RSSI:       Get the RSSI of the last received packet

AT+TDC:       Get or set the application data transmission interval in ms

AT+PORT:     Get or set the application port

AT+DISAT:    Disable AT commands

AT+PWORD:    Set password, max 9 digits

AT+CHS:       Get or Set Frequency (Unit: Hz) for Single Channel Mode

AT+CHE:       Get or Set eight channels mode,Only for US915,AU915,CN470

AT+PDTA:      Print the sector data from start page to stop page

AT+PLDTA:    Print the last few sets of data

AT+CLRDTA:  Clear the storage, record position back to 1st

AT+SLEEP:     Set sleep mode

AT+EXT:        Get or Set external sensor model

AT+BAT:        Get the current battery voltage in mV

AT+CFG:        Print all configurations

AT+WMOD:   Get or Set Work Mode

AT+ARTEMP:  Get or set the internal Temperature sensor alarm range

AT+CITEMP:   Get or set the internal Temperature sensor collection interval in min

AT+SETCNT:   Set the count at present

AT+RJTDC:     Get or set the ReJoin data transmission interval in min

AT+RPL:         Get or set response level

AT+TIMESTAMP:   Get or Set UNIX timestamp in second

AT+LEAPSEC:        Get or Set Leap Second

AT+SYNCMOD:    Get or Set time synchronization method

AT+SYNCTDC:      Get or set time synchronization interval in day

AT+PID:                Get or set the PID

6.2 Where to use AT commands and Downlink commands

AT commands:

image-20220620153708-1.png

Downlink commands:

TTN:

image-20220615092124-2.png

Helium:

image-20220615092551-3.png

Chirpstack:The downlink window will not be displayed until the network is accessed

image-20220615094850-6.png

image-20220615094904-7.png

Aws:

image-20220615092939-4.png

6.3 How to change the uplink interval?

http://wiki.dragino.com/xwiki/bin/view/Main/How%20to%20set%20the%20transmit%20time%20interval/ 

6.4 How to use TTL-USB to connect a PC to input AT commands?

image-20220615153355-1.png

image-20220620154900-5.jpeg

1    < - ->    GND  < - ->    Black

5    < - ->    RXD   < - ->    White

9    < - ->    TXD   < - ->    Green

To switch from download mode to command mode, press reset key

In PC, User needs to set serial tool(such as putty, SecureCRT) baud rate to 9600 to access to access serial console for LHT65N. The AT commands are disable by default and need to enter password (default:123456) to active it. Timeout to input AT Command is 5 min, after 5-minute, user need to input password again. User can use AT+DISAT command to disable AT command before timeout.

Input password and ATZ to activate LHT65N,As shown below:

image-20220615154519-3.png

 

6.5 How to use TTL-USB to connect PC to upgrade firmware?

image-20220615153355-1.png

1    < - ->    GND  < - ->    Black

4    < - ->    3.3V   < - ->    Blue

5    < - ->    RXD   < - ->    White

9    < - ->    TXD   < - ->    Green

image-20220620160241-6.jpeg

Press reset after connecting the 4boot cable to enter the download mode.

image-20220620160516-7.png

Step1: Install TremoProgrammer  first.

image-20220615170542-5.png

Step2:Download the LHT65N image files.

Step3:Select the serial port and baud rate of the device and the firmware to be upgraded.

image-20220615171334-6.png

Step4:Click Start 

image-20220620160723-8.png

7. Order Info

Part Number:  LHT65N-XX-YY

XX : The default frequency band

  •  AS923: LoRaWAN AS923 band

  •  AU915: LoRaWAN AU915 band

  •  EU433: LoRaWAN EU433 band

  •  EU868: LoRaWAN EU868 band

  •  KR920: LoRaWAN KR920 band

  •  US915: LoRaWAN US915 band

  •  IN865: LoRaWAN IN865 band

  •  CN470: LoRaWAN CN470 band

YY: Sensor Accessories

  • E3: External Temperature Probe

     

8. Packing Info

 

Package Includes:

  • LHT65N Temperature & Humidity Sensor x 1

  • Optional external sensor

Dimension and weight:

  • Device Size:  10 x 10 x 3.5 cm

  • Device Weight: 120.5g

 

9. Reference material

10. 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;

(2) this device must accept any interference received, including interference that may cause undesired operation.

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