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Version
Description
Date
0.9
Draft
2019-May-14
1.0
Release
2019-Jun-15
1.1
Modify activation process, Add TTN Payload Decode
2019-Aug-28
1.2
Fix ACT typo, Add cayenne photo. Battery Analyze. Add notice for single
channel use. Add trouble shooting.
2019-Nov-27
1.3
Add External Temperature Sensor pin connection, Improve ST-Link v2
connection description.
2019-Dec-29
1.3.1
Correct myDevices description
2019-Dec-31
1.3.2
Add how to reset device
2020-Jan-17
LHT65 Temperature & Humidity Sensor User Manual
Document Version: 1.7
Image Version: v1.7
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1.5.0
Update Alarm mode description from firmware v1.5
2020-Feb-25
1.7.0
Update Battery Report,FAQ,Update Payload and connection for v1.7 firmware
2020-May-31
1.7.1
Add Sensor probe E3
2020-Jun-9
1.7.2
Fix typo for A2 downlink command to change Interrupt
2020-Jun-30
1.7.3
Fix typo for uplink interval , it should be 20 minutes in default settings
2020-Jul-15
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1. Introduction .............................................................................................................................. 5
1.1 What is LHT65 Temperature & Humidity Sensor ........................................................................ 5
1.2 Features ...................................................................................................................................... 6
1.3 Specifications .............................................................................................................................. 6
1.4 Power Consumption ................................................................................................................... 7
1.5 Storage & Operation Temperature ............................................................................................. 8
1.6 Applications ................................................................................................................................ 8
2. Operation Mode ....................................................................................................................... 9
2.1 How to activate LHT65? ............................................................................................................. 9
2.2 How it works? ............................................................................................................................. 9
2.3 Example to join LoRaWAN network ............................................................................................ 9
2.4 Uplink Payload .......................................................................................................................... 11
2.4.1 Decoder in TTN ............................................................................................................... 12
2.4.2 BAT-Battery Info .............................................................................................................. 12
2.4.3 Built-in Temperature ....................................................................................................... 13
2.4.4 Built-in Humidity ............................................................................................................. 13
2.4.5 Ext # ................................................................................................................................ 13
2.4.6 Ext value ......................................................................................................................... 13
2.4.7 Ext=1, E1 Temperature Sensor ........................................................................................ 14
2.4.8 Ext=4, Interrupt Sensor ................................................................................................... 15
2.4.9 Ext=5, E5 Illumination Sensor ......................................................................................... 17
2.4.10 Ext=6, ADC Sensor .......................................................................................................... 18
2.4.11 Ext=7, Counting Sensor ................................................................................................... 19
2.5 Downlink Payload ..................................................................................................................... 21
2.6 Show data on MyDevices ......................................................................................................... 23
2.7 Read stored sensor data ........................................................................................................... 26
2.8 Alarm Mode.............................................................................................................................. 27
2.9 LED Indicator ............................................................................................................................ 28
3. Use AT Command .................................................................................................................... 29
3.1 Access AT Command ................................................................................................................. 29
3.2 Common AT Command Sequence ............................................................................................. 32
3.2.1 Multi-channel ABP mode (Use with SX1301/LG308) ...................................................... 32
3.2.2 Single-channel ABP mode (Use with LG01/LG02) ........................................................... 32
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3.3 Battery Analyze ........................................................................................................................ 33
3.3.1 Battery Type .................................................................................................................... 33
3.3.2 Power Consumption Analyze .......................................................................................... 34
4. Sensors & Accessories ............................................................................................................. 35
4.1 E1 Temperature Probe .............................................................................................................. 35
4.2 E2 Extension Cable ................................................................................................................... 35
4.3 E3 Temperature Probe .............................................................................................................. 36
4.4 E5 Illumination Pribe ................................................................................................................ 37
5. FAQ ......................................................................................................................................... 38
5.1 How to upgrade the firmware? ................................................................................................ 38
5.2 How to change the LoRa Frequency Bands/Region? ................................................................ 42
5.3 How to set up LHT65 to work with Single Channel Gateway such as LG01/LG02? .................. 42
5.4 How to reset LHT65? ................................................................................................................ 44
5.5 What is the frequency plan of LHT65? ..................................................................................... 44
6. Trouble Shooting ..................................................................................................................... 44
6.1 AT Command input doesn’t work ............................................................................................. 44
6.2 Why the temperature shows 327.67℃? .................................................................................. 44
6.3 Device no responses after Interrupt during upload or configure? ............................................ 44
6.4 Have trouble to register to US915 or AU915 frequency band .................................................. 45
7. Order Info ............................................................................................................................... 46
8. Packing Info ............................................................................................................................ 46
9. Support ................................................................................................................................... 47
10. FCC Warning ........................................................................................................................... 47
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1. Introduction
1.1 What is LHT65 Temperature & Humidity Sensor
The Dragino LHT65 Temperature & Humidity sensor is a Long Range LoRaWAN Sensor. It includes
a built-in SHT20 Temperature & Humidity sensor and has an external sensor connector to
connect to external sensors such as Temperature Sensor, Illumination sensor, Interrupt Sensor,
ADC sensor etc .
The LHT65 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.
LHT65 has a built-in 2400mAh non-chargeable battery which can be used for more than 10
years*.
LHT65 is full compatible with LoRaWAN v1.0.2 protocol, it can work with standard LoRaWAN
gateway.
LHT65 has 3200 data records with datetime which can be retrieved with datetime for further
analyze.
*The actually battery life depends how often to send data, please see battery analyzer chapter.
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1.2 Features
Wall mountable
LoRaWAN Class A protocol
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
Built-in 2400mAh battery for more than 10 year use.
Built-in Temperature & Humidity sensor
Optional External Sensors
Tri-color LED to indicate status
3200 set sensor record with time stamp
1.3 Specifications
Built-in Temperature Sensor:
Resolution: 0.01 °C
Accuracy Tolerance : Typ °C
Long Term Drift: < 0.02 °C /yr
Operating Range: -40 ~ 125 °C
Built-in Humidity Sensor:
Resolution: 0.04 %RH
Accuracy Tolerance : Typ
Long Term Drift: < 0.02 °C /yr
Operating Range: 0 ~ 100 °C
External Temperature Sensor – E1:
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
External Illumination Sensor – E5:
Resolution: 1 lx
Range: 0-65535 lx
Operating Range: -40 °C ~ 85 °C
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1.4 Power Consumption
LHT65 (without external sensor): Idle: 3uA. Transmit: max 130mA.
LHT65 + E1 Temperature Sensor: Idle: 4uA, Transmit: max 130mA.
LHT65 + E5 Illumination Sensor: Idle: 4uA, Transmit: max 130mA.
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1.5 Storage & Operation Temperature
-40°C to +85°C
1.6 Applications
Smart Buildings & Home Automation
Logistics and Supply Chain Management
Smart Metering
Smart Agriculture
Smart Cities
Smart Factory
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Behavior on ACT
Function
Action
Pressing ACT
between 1s < time
< 3s
Test uplink
status
If LHT65 is already Joined to LoRaWAN network, LHT65
will send an uplink packet, if LHT65 has external sensor
connected, blue led will blink once. If LHT65 has not
external sensor, red led will blink once.
Pressing ACT for
more than 3s
Active Device
green led will fast blink 5 times, device will enter working
mode and start to JOIN LoRaWAN network. green led will
solid turn on for 5 seconds after joined in network.
Fast press ACT 5
times.
Deactivate
Device
red led will solid on for 5 seconds. Means LHT65 are in
Deep Sleep Mode.
2. Operation Mode
2.1 How to activate LHT65?
The LHT65 has two working modes:
Deep Sleep Mode: LHT-65 doesn’t have any LoRaWAN activate. This mode is used for
storage and shipping to save battery life.
Working Mode: In this mode, LHT65 will works as LoRaWAN Sensor mode to Join LoRaWAN
network and send out the sensor data to server. Between each sampling/tx/rx periodically,
LHT65 will be in STOP mode (IDLE mode), in STOP mode, device has the same power
consumption as Deep Sleep mode.
The LHT65 is set in deep sleep mode by default; The ACT button on the bottom of device is used
to switch to different modes:
2.2 How it works?
The LHT65 is configured as LoRaWAN OTAA Class A mode by default. Each LHT65 is shipped with
a worldwide unique set of OTAA and ABP keys. To use LHT65 in a LoRaWAN network, user needs
to input the OTAA or ABP keys in the network server. So LHT65 can join the LoRaWAN network
and start to transmit sensor data. The default period for each uplink is 20 minutes.
In case user can’t set the OTAA keys in the network server and has to use the existing keys from
server. User can use AT Command to set the keys in LHT65.
2.3 Example to join LoRaWAN network
This section shows an example for how to join the TTN LoRaWAN IoT server. Use with other
LoRaWAN IoT server is of similar procedure.
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Assume the LG308 is already set to connect to TTN network . We need to add the LHT65 device in
TTN:
Step 1: Create a device in TTN with the OTAA keys from LHT65.
Each LHT65 is shipped with a sticker with the default device EUI as below:
User can enter these keys in the LoRaWAN Server portal. Below is TTN screen shot:
Add APP EUI in the application.
Add APP KEY and DEV EUI
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Size(bytes)
2 2 2 1 4
Value
BAT
Built-In
Temperature
Built-in
Humidity
Ext #
Ext value
Step 2: Use ACT button to activate LHT65 and it will auto join to the TTN network. After join
success, it will start to upload sensor data to TTN and user can see in the panel.
2.4 Uplink Payload
The uplink payload includes totally 11 bytes. Uplink packets use FPORT=2 and every 20 minutes
send one uplink by default.
After each uplink, the BLUE LED will blink once.
First 6 bytes: has fix meanings for every device.
The 7th byte (EXT #): defines the external sensor model.
The 8th ~ 11th 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.)
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Bit(bit)
2
14
Value
BAT Status
00(b): Ultra Low ( BAT <= 2.50v)
01(b): Low (2.50v <=BAT <= 2.55v)
10(b): OK (2.55v <= BAT <=2.65v)
11(b): Good (BAT >= 2.65v)
Actually BAT level
2.4.1 Decoder in TTN
Please check the decoder from this link:
http://www.dragino.com/downloads/index.php?dir=LHT65/payload_decode/
2.4.2 BAT-Battery Info
These two bytes of BAT include the battery state and the actually voltage
Check the battery voltage for LHT65.
BAT status=(0xCBF6>>14)&0xFF=11(B)，very good
Battery Voltage =0xCBF6&0x3FFF=0x0BF6=3062mV
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EXT # Value
External Sensor Type
0x01
Sensor E1, Temperature Sensor
0x04
Sensor E4, Interrupt Sensor
0x05
Sensor E5, Illumination Sensor
0x06
Sensor E6, ADC Sensor
0x07
Sensor E7, Counting Senor
2.4.3 Built-in Temperature
Temperature: 0x0B0D/100=28.29℃
Temperature: (0xF5C6-65536)/100=-26.18℃
2.4.4 Built-in Humidity
Humidity: 0x0376/10=88.6%
2.4.5 Ext #
Bytes for External Sensor:
2.4.6 Ext value
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2.4.7 Ext=1, E1 Temperature Sensor
DS18B20 temp=0x0ADD/100=27.81℃
The last 2 bytes of data are meaningless
DS18B20 temp= (0xF54F-65536)/100=-27.37℃
The last 2 bytes of data are meaningless
If the external sensor is 0x01, and there is no DS18B20 connected. The temperature will be set to
7FFF which is 327.67℃
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AT+EXT=4,1
Sent uplink packet in both rising and falling interrupt
AT+EXT=4,2
Sent uplink packet only in falling interrupt
AT+EXT=4,3
Sent uplink packet only in raising interrupt
2.4.8 Ext=4, Interrupt Sensor
In this mode, user can connect external interrupt sensor to the E2 Extension Cable to check
the open/close status from the sensor. For example, it can be used to connect to a door
sensor to check the open / close status, or connect to a mercury switch to detect the titling.
(NOTE: This feature only supported by SN number > LHT65307029)
Above is connection to a mercury switch, rotate the mercury will generate interrupt. LHT65
will detect it and send an uplink package to sever. User can also connect PA9 and PA10
together, with these two pins shortcut, LHT65 will know if the probe is connected well in the
socket.
User can use AT Command to set the method to detect Interrupt:
Or use downlink command A2
Payload explain:
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Means: The device is set to connect to an Interrupt Sensor, the cable connection is fine. This
packet is for a normal uplink, pin level is high.
Means: The device is set to connect to an Interrupt Sensor, the cable connection is fine. This
packet is for a Interrupt uplink, pin level is low.
Means: The device is set to connect to an Interrupt Sensor, the cable connection is losing.
(Notice: PA9 and PA10 must be connected to detect if cable is losing or fine.).
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2.4.9 Ext=5, E5 Illumination Sensor
Means: The device is set to connect to an Illumination sensor, the cable connection is fine.
This strength of illumination is 401 lux
Means: The device is set to connect to an Illumination sensor, the cable connection is losing.
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2.4.10 Ext=6, ADC Sensor
In this mode, user can connect external ADC sensor to check ADC value. The 3V3_OUT can
be used to power the external ADC sensor; user can control the power on time for this
sensor by setting:
AT+EXT=6,timeout Time to power this sensor, from 0 ~ 65535ms
For example:
AT+EXT=6,1000 will power this sensor for 1000ms before sampling the ADC value.
Or use downlink command A2 to set the same.
User can also connect PA9 and PA10 together, with these two pins shortcut, LHT65 will know
if the probe is connected well in the socket.
Means: The device is set to connect to an ADC sensor, the cable connection is fine. This
voltage detected is 2.822v.
Means: The device is set to connect to an ADC Sensor, but the cable connection is losing.
(Notice: PA9 and PA10 must be connected to detect if cable is losing or fine.).
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AT+EXT=7,0
Count at falling interrupt
AT+EXT=7,1
Count at raising interrupt
AT+SETCNT=60
Sent current count to 60
2.4.11 Ext=7, Counting Sensor
In this mode, user can connect external interrupt sensor to the E2 Extension Cable for
counting purpose. Whenever there is an interrupt from this sensor, the ext value will
increase by 1.
(NOTE: This feature only supported by SN number > LHT65307029)
Above is connection to a mercury switch, rotate the mercury will generate interrupt. LHT65
will count it. It will periodically the counting value to server. User can also connect PA9 and
PA10 together, with these two pins shortcut, LHT65 will know if the probe is connected well
in the socket.
User can use AT Command to set the method to detect counting:
Or use downlink command A2
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Payload explain:
Means: The device is set to connect to a counting sensor, the cable connection is fine. It
detects 6 times event so far.
Means: The device is set to connect to a counting sensor, but the cable connection is losing.
Note: MAX count is FFFF, and then it will go back to 0001
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Downlink Command
FPort
Header
Downlink payload format
TDC (Transmit Time
Interval)
Any
01
Total bytes: 4. Unit: Second
Example:
0x01000258: Set AT+TDC=0x258=600S
Recommend: higher than 0x12C (5 minuntes)
RESET
Any
04
Total bytes: 2
Example: 0x04FF, reset device
AT+CFM
(Set Confirm status)
Any
05
Total bytes: 2
Example: 0x0501: AT+CFM=1, 0x0500: AT+CFM=0
AT+CHE
Any
07
Total bytes: 2
Example: 0x0702: AT+CHE=2
AT+DATE (Set time)
Any
A1
Total bytes: 7
Example:
0xA1190530162158: Set RTC time to 2019-5-30:
16:21:58
AT+EXT
Any
A2
Total bytes: 2 or 3 bytes
Example:
0xA201: Set external sensor type to E1
0xA20401: Same as AT+EXT=4,1
0xA20603E8, Same as AT+EXT=6,1000
0xA2070100, Same as AT+EXT=7,0
0xA2070101, Same as AT+EXT=7,1
0xA20702003c,Same as AT+SETCNT=60
AT+CLRDTA
(Clear Storage)
Any
A3
Total bytes: 2
Example: 0xA301: Clear data storage
AT+RTP
(Set Record Time
Period)
Any
A4
Total bytes: 3 unit: minutes
Example:
0xA4000A: Set record time period to 10 minutes
2.5 Downlink Payload
After each success downlink, the PURPLE LED will blink once.
Example Downlink payload setting in TTN:
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2.6 Show data on MyDevices
myDevices IoT platform provides a human friendly interface to show the sensor data, once we
have sensor data in TTN, we can use myDevices to connect to TTN and see the data in myDevices.
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 myDevices you will need to add integration.
Go to TTN Console --> Applications --> Integrations --> Add Integrations.
Add myDevices:
Select default key as Access Key:
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Search LHT65
Input DevEUI
In myDevices console (https://cayenne.mydevices.com) , add LHT65:
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2.7 Read stored sensor data
LHT65 provides 3200 set local data storage feature, user can use AT Commands to retrieve these
data for further analyze.
By default, LHT65 stores one set of data every 5 minutes. LHT65 has reversed 400 sectors for
storage; each sector can store 8 sets data so total 3200 sets of data can be stored. LHT65 use
circle storage method, means the storage position reach the 400th sector, it will go back and erase
the 1st sector and store from this position.
Below are the AT Commands used to operate these data:
AT+PDTA=start,stop: Print the sector from start to stop.. Example:
AT+PDTA=1,1 will print the first sector (8 set of data)
Explain of the format:
8019500 is the flash address.
19/6/3 16:47 is the time
1 after time means the external sensor type.
2987 : battery voltage
sht_temp and sht_hum are the built in sensor temperature and humidity.
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ds_temp is the external sensor value.
AT+PLDTA: will print the most recent few sets of data. Example:
AT+PLDTA=10 will print the latest 10 sets data
AT+CLRDTA: Clear the storage, record position back to 1st.
AT+RTP: Set record time period, default value 5 minute (AT+RTP=5). If RTP is set to 0, LHT65 will
disable the record feature ( RTP can be set by downlink command)
AT +DATE=19 05 30 16 21 58 set current time to 2019-5-30 16:21:58，AT+DATE=? to check the
current time. System time error is ±2 min per month. This time can be configure via downlink
command.
2.8 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.
Note: Alarm mode will increase a little big the power consumption, we recommend extending
the normal reading time when enable this feature.
AT Commands for Alarm mode:
AT+WMOD=1: Enable/Disable Alarm Mode. (0:Disable, 1: Enable)
AT+CITEMP=1: The interval to check temperature for Alarm. (Unit: minute)
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2.9 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
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3. Use AT Command
3.1 Access AT Command
LHT65 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.
Connection:
USB to TTL GND <--> Dupont black pin
USB to TTL RXD <--> Dupont green pin
USB to TTL TXD <--> Dupont white pin
In PC, User needs to set serial tool(such as putty, SecureCRT) baud rate to 9600 to access to
access serial console for LHT65. 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 LHT65,As shown below:
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Below are the available commands, a more detail AT Command manual can be found at AT
Command Manual
AT+<CMD>? : Help on <CMD>
AT+<CMD> : Run <CMD>
AT+<CMD>=<value> : Set the value
AT+<CMD>=? : Get the value
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
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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+DATE: Get or Set real time
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+RTP: Get or Set record time period in min
AT+CFG: Print all configurations
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3.2 Common AT Command Sequence
3.2.1 Multi-channel ABP mode (Use with SX1301/LG308)
If device has not joined network yet:
123456
AT+FDR
123456
AT+NJM=0
ATZ
If device already joined network:
AT+NJM=0
ATZ
3.2.2 Single-channel ABP mode (Use with LG01/LG02)
Please refer this link: How to Set Single Channel Mode.
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3.3 Battery Analyze
3.3.1 Battery Type
LHT-65 is equipped with a 2400mAH Li-MnO2 battery. The battery is un-rechargeable battery
with low discharge rate targeting for 8~10 years use. This type of battery is commonly used in IoT
target for long term running, such as water meter.
The discharge curve is not linear so can’t simply use percentage to show the battery level. Below
is the battery performance.
Minimum Working Voltage for the LHT65:
LHT65: 2.45v ~ 3.6v
ES-E1 Temperature Sensor : 2.35v ~ 5v
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3.3.2 Power Consumption Analyze
Please refer the battery test report from below link:
http://www.dragino.com/downloads/index.php?dir=LHT65/Test_Report/
It includes the power consumption test base on EU868 and US915 on given transmit interval and
working mode. It also includes the formula for how to calculate the power consumption. User
can calculate the battery life base on a different uplink interval and network coverage on field to
get a reference battery life.
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4. Sensors & Accessories
4.1 E1 Temperature Probe
With DS18B20 Temperature sensor with 1 meter cable long
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: -40 ~ 125 °C
-55°C to 125°C
Working voltage 2.35v ~ 5v
Pin order for E1 Temperature Sensor.
4.2 E2 Extension Cable
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4.3 E3 Temperature Probe
With DS18B20 Temperature sensor with 2 meters cable long
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: -40 ~ 125 °C
-55°C to 125°C
Working voltage 2.35v ~ 5v
Note: Same payload format as E1 probe
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4.4 E5 Illumination Pribe
BH1750 Illumination Sensor:
Resolution: 1 lx
Range: 0-65535 lx
Operating Range: -40 °C ~ 85 °C
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5. FAQ
5.1 How to upgrade the firmware?
The LHT65 is shipped with a program cable, which is used to upload image to LHT65 for:
Support new features
For bug fix
Change LoRaWAN bands.
Video Instruction is here: https://youtu.be/0xpSWTCuDGQ
The latest firmware and changelog can be found at below link:
http://www.dragino.com/downloads/index.php?dir=LHT65/Firmware/
Below shows the hardware connection for how to upload an image to the LHT65:
Note:
1) There are different version ST-Link v2. The white one as below is the most stable and
recommended one.
2) The white version ST-Link v2 such as below photo has different hardware version. The original
one doesn’t have 3.3v on pin 1/2 and the clone one has 3.3v on pin 1/2. User has to short pin19
(VDD 3.3v) and pin 1/2 (TVCC) for the original one so pin 1/2 has 3.3v power. Otherwise, the
original one will have problem to upload firmware to LHT65.
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Connection:
ST-LINK v2 GND <--> Dupont black pin
ST-LINK v2 SWCLK <--> Dupont green pin
ST-LINK v2 RESET <--> Dupont red pin
ST-LINK v2 SWDIO <--> Dupont white pin
Step1: Install ST-LINK driver first and then install ST-LINK Utility
Step2: Download the LHT65 Image files.
http://www.dragino.com/downloads/index.php?dir=LHT65/Firmware/
Step3: click the blue global “settings” button on ST-LINK.
Make sure enable “Connect Under Reset” & “Hardware Reset”.
ST-Link v2 should be able to see the STM32 chip as below.
Then Click Cancel.
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Step4: Click Program & Verify
Step5: The led on the ST-LINK adapter will now blinking, click program verify button to select the
image to be upgraded.
Step5: Click the start button to download the image to LHT65.
*If you change different LoRa Frequency Bands/Region, you need using AT+FDR command
to restore factory data after program success
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5.2 How to change the LoRa Frequency Bands/Region?
User can follow the introduction for how to upgrade image. When download the images, choose
the required image file for download.
5.3 How to set up LHT65 to work with Single Channel Gateway such as LG01/LG02?
In this case, users need to set LHT65 to work in ABP mode & transmit in only one frequency.
Assume we have a LG02 working in the frequency 868400000 now, below is the step.
Note: EU868 firmware can’t set to Single Frequency, to use single frequency in EU, user can first
upgrade the firmware to IN865 and set it to work in Single Frequency.
Step1: Log in TTN, Create an ABP device in the application and input the network session key
(NETSKEY), app session key (APPSKEY) from the device.
Note: user just need to make sure above three keys match, User can change either in TTN or Device to make then
match. In TTN, NETSKEY and APPSKEY can be configured by user in setting page, but Device Addr is generated by
TTN.
Step2: Run AT Command to make LHT65 work in Single frequency & ABP mode. Below is the AT
commands:
123456 Enter Password to have AT access.
AT+FDR Reset Parameters to Factory Default, Keys Reserve
123456 Enter Password to have AT access.
AT+NJM=0 Set to ABP mode
AT+ADR=0 Set the Adaptive Data Rate Off
AT+DR=5 Set Data Rate (Set AT+DR=3 for 915 band)
AT+TDC=60000 Set transmit interval to 60 seconds
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AT+CHS=868400000 Set transmit frequency to 868.4Mhz
AT+DADDR=26 01 1A F1 Set Device Address to 26 01 1A F1
ATZ Reset MCU
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5.4 How to reset LHT65?
The LHT65 has below pins in the back.
Use a metal wire to short NRST and GND pin will reset the LHT65.
5.5 What is the frequency plan of LHT65?
LHT65 use the same frequency as other Dragino products. User can see the detail from this
link:
http://wiki.dragino.com/index.php?title=End_Device_Frequency_Band#Introduction
6. Trouble Shooting
6.1 AT Command input doesn’t work
In the case if user can see the console output but can’t type input to the device. Please check
if you already include the <ENTER> while sending out the command. Some serial tool doesn’t
send <ENTER> after press the send key, user need to add <ENTER> in their string.
6.2 Why the temperature shows 327.67℃?
If the external sensor is 0x01, and there is no DS18B20 connected. The temperature will be
set to 7FFF which is 327.67℃. In this case, please check the connection between the
DS18B20 and the LHT65. User need to push the DS18B20 Audio jack hard to make the
connection firmly. User will feel a click sound if connection is good.
6.3 Device no responses after Interrupt during upload or configure?
Possible the LHT65 are in program mode, try to short the NRST pin to GND to make it reset.
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6.4 Have trouble to register to US915 or AU915 frequency band
Please see if related to the channel selection issue as shown here.
http://wiki.dragino.com/index.php?title=LoRaWAN_Communication_Debug#Notice_of_US915.2FCN470.2FAU91
5_Frequency_band
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7. Order Info
Part Number: LHT65-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:
00: no external sensor
E1: with model E1, temperature Probe (Default version)
E2: with 3.5mm to 5 wire cable (For Interrupt, ADC, Counting)
E3: Flat Temperature Probe (DS18B20)
E5: with illumination Probe
External sensor can be ordered separately by using the sensor model + ES as prefix:
Part Number: ES-YY
Example: ES-E1
8. Packing Info
Package Includes:
LHT65 Temperature & Humidity Sensor x 1
Program cable x 1
Optional external sensor
Dimension and weight:
Device Size: cm
Device Weight:
Package Size / pcs : cm
Weight / pcs :
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9. Support
Support is provided Monday to Friday, from 09:00 to 18:00 GMT+8. Due to different
timezones we cannot offer live support. However, your questions will be answered as soon
as possible in the before-mentioned schedule.
Provide as much information as possible regarding your enquiry (product models, accurately
describe your problem and steps to replicate it etc) and send a mail to
support@dragino.com
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, and
(2) this device must accept any interference received,including interference that may cause
undesired operation
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