Table of Contents：

• 1. Introduction
  • 1.1 What is LHT65N-E5 Temperature,Humidity&Illuminance Sensor
  • 1.2 Features
  • 1.3 Specification
• 2. Connect LHT65N-E5 to IoT Server
  • 2.1 How does LHT65N-E5 work?
  • 2.2 How to Activate LHT65N-E5?
  • 2.3 Example to join LoRaWAN network
    • 2.3.1 Step 1: Create Device n TTN
    • 2.3.2 Step 2: Activate LHT65N-E5 by pressing the ACT button for more than 5 seconds.
  • 2.4 Uplink Payload   ( Fport=2)
    • 2.4.1 Decoder in TTN V3
    • 2.4.2 BAT-Battery Info
    • 2.4.3 Built-in Temperature
    • 2.4.4 Built-in Humidity
    • 2.4.5 Ext value
      • 2.4.5.1 Ext=0x05, Illuminance Sensor
      • 2.4.5.2 Ext=0x85, E5 sensor with Unix Timestamp
  • 2.5 Show data on Datacake
  • 2.6 Datalog Feature
    • 2.6.1 Ways to get datalog via LoRaWAN
    • 2.6.2 Unix TimeStamp
    • 2.6.3 Set Device Time
    • 2.6.4 Poll sensor value
    • 2.6.5 Datalog Uplink payload
  • 2.7 Alarm Mode
    • 2.7.1 ALARM MODE
  • 2.8 LED Indicator
  • 2.9 installation
• 3. Sensors and Accessories
  • 3.1 E2 Extension Cable
• 4. Configure LHT65N-E5 via AT command or LoRaWAN downlink
  • 4.1 Set Transmit Interval Time
  • 4.2 Currently only supports E5
  • 4.3 Set to sleep mode
  • 4.4 Set system time
  • 4.5 Set Time Sync Mode
  • 4.6 Set Time Sync Interval
  • 4.7 Get data
  • 4.8 Print data entries base on page
  • 4.9 Print last few data entries
  • 4.10 Clear Flash Record
  • 4.11 Auto Send None-ACK messages
• 5. Battery & How to replace
  • 5.1 Battery Type
  • 5.2 Replace Battery
  • 5.3 Battery Life Analyze
• 6. FAQ
  • 6.1 How to use AT Command?
  • 6.2 Where to use AT commands and Downlink commands
  • 6.3 How to change the uplink interval？
  • 6.4 How to upgrade firmware?
• 7. Order Info
• 8. Packing Info
• 9. Reference material
• 10. FCC Warning

1. Introduction

1.1 What is LHT65N-E5 Temperature,Humidity&Illuminance Sensor

1.2 Features

• LoRaWAN v1.0.3 Class A protocol
• Frequency Bands: CN470/EU433/KR920/US915/EU868/AS923/AU915
• AT Commands to change parameters
• Remote configure parameters via LoRaWAN Downlink
• Firmware upgradeable via program port
• Built-in 2400mAh battery for up to 10 years of use.
• Built-in Temperature & Humidity sensor
• External Illuminance Sensor
• Tri-color LED to indicate working status
• Datalog feature to save sensor data when no LoRaWAN network

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

Built-in Humidity Sensor:

• Resolution: 0.04 %RH
• Accuracy Tolerance : Typ ±3 %RH
• Long Term Drift: < 0.25 RH/yr
• Operating Range: 0 ~ 96 %RH

External IIIuminace Sensor:

• Base on BH1750 Illumination Sensor
• Cable Length : 50cm
• Resolution: 1 lx
• Range: 0-65535 lx
• Operating Range: -40 °C ~ 85 °C

2. Connect LHT65N-E5 to IoT Server

2.1 How does LHT65N-E5 work?

2.2 How to Activate LHT65N-E5?

• Deep Sleep Mode: LHT65N-E5 doesn't have any LoRaWAN activation. This mode is used for storage and shipping to save battery life.

• Working Mode:     In this mode, LHT65N-E5 works as LoRaWAN Sensor mode to Join LoRaWAN network and send out the sensor data to the server. Between each sampling/tx/rx periodically, LHT65N-E5 will be in STOP mode (IDLE mode), in STOP mode, LHT65N-E5 has the same power consumption as Deep Sleep mode.  

2.3 Example to join LoRaWAN network

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.

2.3.1 Step 1: Create Device n TTN

User can enter these keys in the LoRaWAN Server portal. Below is TTN V3 screenshot:

Add APP EUI in the application.

Note: LHT65N-E5 use same payload decoder as LHT65.

Input APP EUI,  APP KEY and DEV EUI:

2.3.2 Step 2: Activate LHT65N-E5 by pressing the ACT button for more than 5 seconds.

2.4 Uplink Payload   ( Fport=2)

• The First 6 bytes: has fix meanings for every LHT65N-E5.
• The 7th byte (EXT #): defines the external sensor model. It can be 0x05 or 0x09 for LHT65N-E5
• The 8^th ~ 9^th byte: Illuminance. Range: 0-65535 lx. 
• The 10th ~ 11th byte: Reserve, always 0xFFFF

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-E5 decoder in TTNv3 for friendly reading.

Below is the position to put the decoder and LHT65N-E5 decoder can be download from here: https://github.com/dragino/dragino-end-node-decoder

2.4.2 BAT-Battery Info

These two bytes of BAT include the battery state and the actually voltage

Check the battery voltage for LHT65N-E5.

• BAT status=(0Xcba4>>14)&0xFF=11(B)，very good
• Battery Voltage =0xCBF6&0x3FFF=0x0BA4=2980mV

2.4.3 Built-in Temperature

• Temperature:  0x0ABB/100=27.47℃

• Temperature:  (0xF5C6-65536)/100=-26.18℃

2.4.4 Built-in Humidity

• Humidity:    0x025C/10=60.4%

2.4.5 Ext value

2.4.5.1 Ext=0x05, Illuminance Sensor

• Illumination=0x005E=94 lux

The last 2 bytes of data are meaningless

• When the sensor is not connected or not connected properly, will show "NULL"

          The last 2 bytes of data are meaningless

2.4.5.2 Ext=0x85, E5 sensor with Unix Timestamp

• Battery status & Built-in Humidity

• Status & Ext Byte

• Poll Message Flag:    1: This message is a poll message reply, 0: means this is a normal uplink.
• Sync time OK:           1: Set time ok，0: N/A. After time SYNC request is sent, LHT65N-E5 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-E5 will set this bit to 1 every 10 days to request a time SYNC. (AT+SYNCMOD to set this)

2.5 Show data on Datacake

Select default key as Access Key:

In Datacake console (https://datacake.co/) , add LHT65 device.

2.6 Datalog Feature

2.6.1 Ways to get datalog via LoRaWAN

There are two methods:

Method 1: IoT Server sends a downlink LoRaWAN command to poll the value for specified time range.

Method 2: Set PNACKMD=1, LHT65N-E5 will wait for ACK for every uplink, when there is no LoRaWAN network, LHT65N-E5 will mark these records with non-ack messages and store the sensor data, and it will send all messages (10s interval) after the network recovery.

Note for method 2:

• a) LHT65N-E5 will do an ACK check for data records sending to make sure every data arrive server.
• b) LHT65N-E5 will send data in CONFIRMED Mode when PNACKMD=1, but LHT65N-E5 won't re-transmit the packet if it doesn't get ACK, it will just mark it as a NONE-ACK message. In a future uplink if LHT65N-E5 gets a ACK, LHT65N-E5 will consider there is a network connection and resend all NONE-ACK Message. 

Below is the typical case for the auto-update datalog feature (Set PNACKMD=1)

2.6.2 Unix TimeStamp

LHT65N-E5 uses Unix TimeStamp format based on

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

Below is the converter example

So, we can use AT+TIMESTAMP=1611889405 or downlink 3060137afd00 to set the current time 2021 – Jan -- 29 Friday 03:03:25

2.6.3 Set Device Time

2.6.4 Poll sensor value

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

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 31 5FC5F350 5FC6 0160 05 

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

Uplink Internal =5s, means LHT65N-E5 will send one packet every 5s. range 5~255s.

2.6.5 Datalog Uplink payload

The Datalog poll reply uplink will use below payload format.

Retrieval data payload:

Poll message flag & Ext:

No ACK Message:  1: This message means this payload is fromn Uplink Message which doesn't get ACK from the server before ( for PNACKMD=1 feature)

Poll Message Flag: 1: This message is a poll message reply.

• Poll Message Flag is set to 1.

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

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

a) DR0: max is 11 bytes so one entry of data

b) DR1: max is 53 bytes so devices will upload 4 entries of data (total 44 bytes)

c) DR2: total payload includes 11 entries of data

d) DR3: total payload includes 22 entries of data.

If devise doesn't have any data in the polling time. Device will uplink 11 bytes of 0    

Example:

If LHT65N-E5 has below data inside Flash:

If user sends below downlink command:  3160065F9760066DA705

Where : Start time: 60065F97 = time 21/1/19 04:27:03

             Stop time: 60066DA7= time 21/1/19 05:27:03

LHT65N-E5 will uplink this payload.

7FFF089801464160065F97 7FFF 088E 014B 41 60066009 7FFF0885014E41600660667FFF0875015141600662BE7FFF086B015541600665167FFF08660155416006676E7FFF085F015A41600669C67FFF0857015D4160066C1E

Where the first 11 bytes is for the first entry:

7FFF089801464160065F97

Ext sensor data=0x7FFF/100=327.67

Temp=0x088E/100=22.00

Hum=0x014B/10=32.6

poll message flag & Ext=0x41,means reply data,Ext=1

Unix time is 0x60066009=1611030423s=21/1/19 04:27:03

2.7 Alarm Mode

2.7.1 ALARM MODE

Downlink Command: AAXXXXXXXXXXXXXX

Total bytes: 8 bytes

Example:AA0100010001003C

WMOD=01

CITEMP=0001

TEMPlow=0001

TEMPhigh=003C

2.8 LED Indicator

The LHT65 has a triple color LED which for easy showing different stage .

While user press ACT button, the LED will work as per LED status with ACT button.

In a normal working state:

• For each uplink, the BLUE LED or RED LED will blink once.
  BLUE LED when external sensor is connected.
• RED LED when external sensor is not connected
• For each success downlink, the PURPLE LED will blink once

2.9 installation

3. Sensors and Accessories

3.1 E2 Extension Cable

1m long breakout cable for LHT65N-E5. Features:

• Use for AT Command

• Update firmware for LHT65N-E5

• Exposed All pins from the LHT65N-E5 Type-C connector.

   

4. Configure LHT65N-E5 via AT command or LoRaWAN downlink

• AT Command Connection: See FAQ.

• LoRaWAN Downlink instruction for different platforms: IoT LoRaWAN Server

• General Commands.

1. General system settings like: uplink interval.

2. LoRaWAN protocol & radio-related commands.

• Commands special design for LHT65N-E5

4.1 Set Transmit Interval Time

Feature: Change LoRaWAN End Node Transmit Interval.

AT Command: AT+TDC

Downlink Command: 0x01

Format: Command Code (0x01) followed by 3 bytes time value.

If the downlink payload=0100003C, it means set the END Node's Transmit Interval to 0x00003C=60(S), while type code is 01.

• Example 1: Downlink Payload: 0100001E         // Set Transmit Interval (TDC) = 30 seconds

• Example 2: Downlink Payload: 0100003C         // Set Transmit Interval (TDC) = 60 seconds

4.2 Currently only supports E5

Feature: Set device password, max 9 digits

AT Command: AT+EXT

Downlink Command:0xA2

Total bytes: 2 bytes

Example:

• 0xA205: Set external sensor type to E5

4.3 Set to sleep mode

Feature: Set device to sleep mode

• AT+Sleep=0  : Normal working mode, device will sleep and use lower power when there is no LoRa message
• AT+Sleep=1 :  Device is in deep sleep mode, no LoRa activation happen, used for storage or shipping.

AT Command: AT+SLEEP

Downlink Command:

• There is no downlink command to set to Sleep mode.

4.4 Set system time

Feature: Set system time, unix format. See here for format detail.

AT Command:

Downlink Command:

0x306007806000        //  Set timestamp to 0x(6007806000),Same as AT+TIMESTAMP=1611104352

4.5 Set Time Sync Mode

AT Command:

Downlink Command:

0x28 01             //  Same As AT+SYNCMOD=1
0x28 00             //  Same As AT+SYNCMOD=0

4.6 Set Time Sync Interval

Feature: Define System time sync interval. SYNCTDC default value: 10 days.

AT Command:

Downlink Command:

0x29 0A       // Same as AT+SYNCTDC=0x0A

4.7 Get data

Feature: Get the current sensor data.

AT Command:

• AT+GETSENSORVALUE=0      // The serial port gets the reading of the current sensor
• AT+GETSENSORVALUE=1      // The serial port gets the current sensor reading and uploads it.

4.8 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

Downlink Command:

No downlink commands for feature

4.9 Print last few data entries

Feature: Print the last few data entries

AT Command: AT+PLDTA

Downlink Command:

No downlink commands for feature

4.10 Clear Flash Record

Feature: Clear flash storage for data log feature.

AT Command: AT+CLRDTA

Downlink Command: 0xA3

• Example: 0xA301        //  Same as AT+CLRDTA

4.11 Auto Send None-ACK messages

Feature: LHT65N-E5 will wait for ACK for each uplink, If LHT65N-E5 doesn't get ACK from the IoT server, it will consider the message doesn't arrive server and store it. LHT65N-E5 keeps sending messages in normal periodically. Once LHT65N-E5 gets ACK from a server, it will consider the network is ok and start to send the not-arrive message.

AT Command: AT+PNACKMD

The default factory setting is 0

Downlink Command: 0x34

• Example: 0x3401       //  Same as AT+PNACKMD=1

5. Battery & How to replace

5.1 Battery Type

The minimum Working Voltage for the LHT65N-E5 is ~ 2.5v. When battery is lower than 2.6v, it is time to change the battery.
 

5.2 Replace Battery

LHT65N-E5 has two screws on the back, Unscrew them, and changing the battery inside is ok. The battery is a general CR17450 battery (3.0v). Any brand should be ok.

5.3 Battery Life Analyze

6. FAQ

6.1 How to use AT Command?

Refer this link for UART Hardware Connection.

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：

Downlink commands:

TTN:

Helium：

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

Aws:

6.3 How to change the uplink interval？

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

6.4 How to upgrade firmware?

Please check update instruction.

7. Order Info

Part Number:  LHT65N-E5-XX

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

8. Packing Info

Package Includes:

• LHT65N-E5 Temperature/Humidity/Illuminance Sensor x 1

9. Reference material

• Datasheet, photos, decoder, firmware

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.