Dragino LHT65 User Manual
www.dragino.com
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
LHT65 Temperature & Humidity Sensor User Manual
Document Version: 1.3
Image Version: v1.4
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1. Introduction .............................................................................................................................. 4
1.1 What is LHT65 Temperature & Humidity Sensor ........................................................................ 4
1.2 Features ...................................................................................................................................... 5
1.3 Specifications .............................................................................................................................. 5
1.4 Power Consumption ................................................................................................................... 5
1.5 Storage & Operation Temperature ............................................................................................. 6
1.6 Applications ................................................................................................................................ 6
2. Operation Mode ....................................................................................................................... 7
2.1 How to activate LHT65? ............................................................................................................. 7
2.2 How it works? ............................................................................................................................. 7
2.3 Example to join LoRaWAN network ............................................................................................ 7
2.4 Uplink Payload ............................................................................................................................ 9
2.4.1 Decoder in TTN ............................................................................................................... 10
2.4.2 BAT-Battery Info .............................................................................................................. 11
2.4.3 Built-in Temperature ....................................................................................................... 11
2.4.4 Built-in Humidity ............................................................................................................. 12
2.4.5 Ext # ................................................................................................................................ 12
2.4.6 Ext value ......................................................................................................................... 12
2.5 Downlink Payload ..................................................................................................................... 14
2.6 Show data on Cayenne ............................................................................................................. 14
2.7 Read stored sensor data ........................................................................................................... 17
2.8 Frequency Plans ........................................................................................................................ 18
2.8.1 EU863-870 (EU868) ........................................................................................................ 18
2.8.2 US902-928(US915).......................................................................................................... 18
2.8.3 CN470-510 (CN470) ........................................................................................................ 19
2.8.4 AU915-928(AU915) ......................................................................................................... 19
2.8.5 AS920-923 & AS923-925 (AS923) ................................................................................... 20
2.8.6 KR920-923 (KR920) ......................................................................................................... 21
2.8.7 IN865-867 (IN865) .......................................................................................................... 21
2.9 LED Indicator ............................................................................................................................ 21
3. Use AT Command .................................................................................................................... 22
3.1 Access AT Command ................................................................................................................. 22
3.2 Common AT Command Sequence ............................................................................................. 25
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3.2.1 Multi-channel ABP mode (Use with SX1301/LG308) ...................................................... 25
3.2.2 Single-channel ABP mode (Use with LG01/LG02) ........................................................... 25
3.3 Battery Analyze ........................................................................................................................ 26
3.3.1 Battery Type .................................................................................................................... 26
3.3.2 Power consumption Analyze .......................................................................................... 27
4. Sensors & Accessories ............................................................................................................. 29
4.1 E1 Temperature Sensor............................................................................................................. 29
5. FAQ ......................................................................................................................................... 30
5.1 How to upgrade the firmware? ................................................................................................ 30
5.2 How to change the LoRa Frequency Bands/Region? ................................................................ 34
5.3 How to choose the right frequency band set for US915, AU915, CN470 bands? ..................... 34
5.4 How to set up LHT65 to work with Single Channel Gateway such as LG01/LG02? .................. 36
6. Trouble Shooting ..................................................................................................................... 38
6.1 AT Command input doesn’t work ............................................................................................. 38
6.2 Why the temperature shows 327.67℃? .................................................................................. 38
7. Order Info ............................................................................................................................... 39
8. Packing Info ............................................................................................................................ 39
9. Support ................................................................................................................................... 40
10. FCC Warning ........................................................................................................................... 40
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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, Soil Moisture Sensor, Tilting 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
1.4 Power Consumption
LHT65 (without external sensor): Idle: 3uA. Transmit: max 130mA.
LHT65 + E1 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 10 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 10 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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2.4.1 Decoder in TTN
function Decoder(bytes, port) {
// Decode an uplink message from a buffer
// (array) of bytes to an object of fields.
var value=(bytes[0]<<8 | bytes[1]) & 0x3FFF;
var batV=value/1000;//Battery,units:V
value=bytes[2]<<8 | bytes[3];
if(bytes[2] & 0x80)
{value |= 0xFFFF0000;}
var temp_SHT=(value/100).toFixed(2);//SHT20,temperature,units:℃
value=bytes[4]<<8 | bytes[5];
var hum_SHT=(value/10).toFixed(1);//SHT20,Humidity,units:%
value=bytes[7]<<8 | bytes[8];
if(bytes[7] & 0x80)
{value |= 0xFFFF0000;}
var temp_ds=(value/100).toFixed(2);//DS18B20,temperature,units:℃
return {
BatV:batV,
TempC_DS:temp_ds,
TempC_SHT:temp_SHT,
Hum_SHT:hum_SHT
};
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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
}
2.4.2 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
2.4.3 Built-in Temperature
Temperature: 0x0B0D/100=28.29℃
Temperature: (0xF5C6-65536)/100=-26.18℃
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EXT # Value
External Sensor Type
0x01
Sensor E1, Temperature
Sensor(DS18B20)
2.4.4 Built-in Humidity
Humidity: 0x0376/10=88.6%
2.4.5 Ext #
Bytes for External Sensor:
2.4.6 Ext value
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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