Table of Contents:

• 1. Introduction
  • 1.1 What is the LHT65N-VIB LoRaWAN Vibration Sensor?
  • 1.2 Features
  • 1.3 Specification
• 2. Registering LHT65N-VIB with a LoRaWAN Network Server
  • 2.1 How does the LHT65N-VIB work?
  • 2.2 How to Activate LHT65N-VIB?
  • 2.3 Registering with The Things Stack
    • 2.3.1 Add LHT65N-VIB to The Things Stack
      • 3.2.2.1 Creating an application
      • 3.2.2.2 Adding using the LoRaWAN device repository
      • 3.2.2.3 Adding manually
    • 2.3.2 Activate the LHT65N-VIB by pressing and holding the ACT button for more than 5 seconds.
    • 2.3.3 Uplink Decoder in The Things Stack
  • 2.4 Uplink Payload (FPort=2)
    • 2.4.1 VIBMOD=1
      • 2.4.1.1 BAT (Battery Voltage)
      • 2.4.1.2 MOD, Alarm, and TDC
      • 2.4.1.3 vib_count
      • 2.4.1.4 work_min
    • 2.4.2 VIBMOD=2
      • 2.4.2.1 BAT (Battery Voltage)
      • 2.4.2.2 VIBMOD, Alarm and TDC
      • 2.4.2.3 vib_count
      • 2.4.2.4 TempC_SHT
      • 2.4.2.5 Hum_SHT
    • 2.4.3 VIBMOD=3
      • 2.4.3.1 BAT (Battery Voltage)
      • 2.4.3.2 VIBMOD and Alarm and TDC
      • 2.4.3.3 TempC_SHT
      • 2.4.3.4 Hum_SHT
      • 2.4.3.5 work_min
    • 2.4.4 VIBMOD=4 (FPort=7)
  • 2.5 Integrating with IoT platforms
    • 2.5.1 Integrate and show data on ThingsEye
    • 2.5.2 Integrate and show data on Datacake
  • 2.8 LED Indicator
  • 2.9 Installation
• 3. Configure the LHT65N-VIB via AT commands or LoRaWAN downlinks
  • 3.1 Set Transmit Interval Time
  • 3.2 Set Vibration Sensor Mode
  • 3.3 Vibration sensitivity setting
  • 3.4 Set Password
  • 3.5 Quit AT Command
  • 3.6 Set to sleep mode
  • 3.7 Set system time
  • 3.8 Set Time Sync Mode
  • 3.9 Set Time Sync Interval
  • 3.10 Get data
  • 3.11 Print data entries base on page
  • 3.12 Print last few data entries
  • 3.13 Clear Flash Record
  • 3.14 Auto Send None-ACK messages
• 4. Batteries
  • 4.1 Battery Type
  • 4.2 Replacing Batteries
  • 4.3 Battery Life Analysis
• 5. FAQ
  • 5.1 How to connect to LHT65N-VIB via UART interface?
    • 5.1.1 Options for USB to TTL adapter
    • 5.1.2 Options for Type-C adapter
    • 5.1.3 Connection Example
  • 5.2 How to use AT commands?
    • 5.2.1 AT commands
  • 5.3 How to use Downlink commands?
    • 5.3.1 The Things Stack
    • 5.3.2 Helium
    • 5.3.3 ChirpStack
    • 5.3.4 AWS-IoT
  • 5.4 How to change the uplink interval?
  • 5.5 How to upgrade the firmware?
  • 5.6 Why can't I see the datalog information
  • 5.7 How can I read sensor data without LoRaWAN? (For Calibration Purpose)
• 6. Ordering Information
• 7. Packing Information
• 8. Reference Materials
• 9. FCC Warning
• 10. Use Cases
  • 10.1 Install LHT65N-VIB to detect the number of uses of handwashing stations
  • 10.2 Install LHT65N-VIB to detect the number of times the toilet is used
  • 10.3 VIBMOD4 detect vibration intensity

1. Introduction

1.1 What is the LHT65N-VIB LoRaWAN Vibration Sensor?

The Dragino LHT65N-VIB LoRaWAN Vibration Sensor is designed to detect and measure vibrations, shocks, and accelerations of an object. By analyzing the object's motion, the LHT65N-VIB can send meaningful data such as alarms, device runtime, vibration counts, and vibration strength to an IoT platform for further analysis.

It can be used in professional wireless sensor network applications, including equipment status monitoring, water leakage alarms, usage statistics, vibration intensity detection, and more.

The LHT65N-VIB supports a datalogging feature, allowing it to record data when there is no network coverage. Users can retrieve the sensor readings later, ensuring no data is missed.

The LHT65N-VIB enables users to send data over extremely long distances. It offers ultra-long-range spread spectrum communication and high interference immunity while minimizing current consumption.

The LHT65N-VIB has a built-in 2400mAh non-rechargeable battery, which can last up to 3 years*.

The LHT65N-VIB is fully compatible with the LoRaWAN v1.0.3, Class A mode and can work with a standard LoRaWAN gateway.

*The actual battery life depends on how frequently data is transmitted. Please refer to the battery analyzer chapter for more details.

1.2 Features

• LoRaWAN v1.0.3, Class A mode
• Frequency Bands: CN470/EU433/KR920/US915/EU868/AS923/AU915
• Detecting object vibration status
• Detect vibration alarm
• 3-axis accelerator for x,y,z
• Calcula device runtime
• Built-in 2400mAh battery for long time use
• Built-in Temperature & Humidity sensor
• Tri-color LED to indicate working status
• Datalog feature (Max 3328 records)
• AT Commands to change parameters
• Remote configure parameters via LoRaWAN Downlink
• Firmware upgradeable via program port

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 Vibration Sensor:

• Detecting object vibration status
• accelerator for x,y,z
• Small size for easy installation
• Acceleration: ±2g,±4g,±8g;±16g
• Frequency: 25Hz,50Hz,100Hz,200Hz,400Hz

2. Registering LHT65N-VIB with a LoRaWAN Network Server

The LHT65N-VIB can be registered with any LoRaWAN network server. In this documentation, we use The Things Stack as an example, but similar settings may apply to other LoRaWAN network servers.

2.1 How does the LHT65N-VIB work?

2.2 How to Activate LHT65N-VIB?

2.3 Registering with The Things Stack

In this section we will guide you through on how to register the LHT65N-VIB with The Things Stack. If your area has The Things Stack community network coverage, you can use it without setting up your own network. If not, you can set up your own LoRaWAN network coverage by using our LPS8N LoRaWAN gateway. 

The typical end-to-end network setup with LHT65N-VIB  and LPS8v2 is shown below:

2.3.1 Add LHT65N-VIB to The Things Stack

• From the LoRaWAN device repository
• Manually

3.2.2.1 Creating an application

Sign up for a free account with The Things Stack Sandbox if you do not have one yet. Then, create an application as shown in the screenshots below.

3.2.2.2 Adding using the LoRaWAN device repository

You can refer to the screenshots below to register your LHT65N-VIB using The Things Stack's LoRaWAN device repository.

3.2.2.3 Adding manually

You can refer to the screenshots below to register your LHT65N-VIB using The Things Stack's manual option.

1. Create 

Add APP EUI and DEV EUI

Add APP EUI in the application

Add APP KEY

2.3.2 Activate the LHT65N-VIB by pressing and holding the ACT button for more than 5 seconds.

2.3.3 Uplink Decoder in The Things Stack

When the uplink payload arrives in The Things Stack, it is displayed in HEX format, which is not easy to read. You can add the LHT65N-VIB decoder in The Things Stack for easier readability.

The LHT65N-VIB decoder can be downloaded from here: https://github.com/dragino/dragino-end-node-decoder

The uplink decoder can be added to the Uplink Payload Formatters of your device in The Things Stack. Refer to the screenshot below.

2.4 Uplink Payload (FPort=2)

2.4.1 VIBMOD=1

VIBMOD=1 represent the battery voltage, working mode, alarm status, TDC, vibration count, and work_min.

The following subsections describe each field:

2.4.1.1 BAT (Battery Voltage)

These two bytes represent the battery voltage. See the image below.

Calculate the battery voltage for the LHT65N-VIB, if the BAT=0B F2.

Convert 0x0BF2 to decimal (3058) and then divide by 1000 to get the voltage.

• 0x0BF2 (hex) = 3058 (dec)
• 3058/1000 = 3.058 V

2.4.1.2 MOD, Alarm, and TDC

This byte represent working mode, alarm status, and TCD. See the image below.

bytes[2]=0x06=0000 0110

Current working mode:

• (bytes[2]>>2)&0x07
• Shift two bits to right (0000 0110 -> 0000 0001)
• Then bitwise AND with 0x07 (0000 0001 & 0000 0111 = 0000 0001 = 1)

Current alarm status:

• (bytes[2] & 0x01)? "TRUE":"FALSE"
• 0000 0110 & 0000 0001 = 0000 0000 = 0 = FALSE

Is the current data triggered by TDC (data uploaded due to alarm)?

• (bytes[2] & 0x02)? "YES":"NO"
• 0000 0110 & 0000 0010 = 0000 0010 = 2 (NON-ZERO VALUE) = YES

2.4.1.3 vib_count

These 4 bytes (vib_count) represent the number of vibration events that has been recorded. See the image below.

• 0x00000007=7

2.4.1.4 work_min

These 4 bytes (work_min) indicate the duration the current vibration sensor has been active since the latest trigger. See the image below.

• 0x00000000=0

0 means that the current vibration sensor is not triggered.

2.4.2 VIBMOD=2

VIBMOD=2 represent the battery voltage, working mode, alarm status, TDC, vibration count, TempC_SHT, and Hum_SHT.

2.4.2.1 BAT (Battery Voltage)

These two bytes represent the battery voltage. See the image below.

Calculate the battery voltage for LHT65N-VIB.

• 0x0BC6/1000=3.014V

2.4.2.2 VIBMOD, Alarm and TDC

This byte represent working mode, alarm status, and TCD. See the image below.

bytes[2]=0x0A=0000 0101

Current working mode=(bytes[2]>>2)&0x07=2

Current alarm situation= (bytes[2] & 0x01)? "TRUE":"FALSE";=0=FALSE

Whether the current data occurs is TDC (the data will be uploaded by the alarm)= (bytes[2] & 0x02)? "YES":"NO";=00000010 (non -zero value)=YES

2.4.2.3 vib_count

These 4 bytes represent the number of vibration events that has been recorded. See the image below.

• 0x00000000=0

2.4.2.4 TempC_SHT

These 2 bytes represent the temperature measured by the built-in temperature & humidity sensor, SHT31.

• 0x0B22/100=28.5 C

2.4.2.5 Hum_SHT

These 2 bytes represent the humidity measured by the built-in temperature & humidity sensor, SHT31.

• 0x0212/10=53

2.4.3 VIBMOD=3

VIBMOD=3 represents the battery voltage, working mode, alarm status, TDC, TempC_SHT, Hum_SHT, and work_min.

2.4.3.1 BAT (Battery Voltage)

These 2 bytes represent the battery voltage.

• 0x0BC2/1000=3.01V

2.4.3.2 VIBMOD and Alarm and TDC

This byte represents the working mode, alarm status, and TDC.

bytes[2]=0x0A=0000 1110

Current working mode=(bytes[2]>>2)&0x07=3

Current alarm situation= (bytes[2] & 0x01)? "TRUE":"FALSE";=0=FALSE

Whether the current data occurs is TDC (the data will be uploaded by the alarm)= (bytes[2] & 0x02)? "YES":"NO";=00000010 (non -zero value)=YES

2.4.3.3 TempC_SHT

These 2 bytes represent the temperature measured by the built-in temperature & humidity sensor, SHT31.

• 0x0B21/100=28.49 C

2.4.3.4 Hum_SHT

These 2 bytes represent the humidity measured by the built-in temperature & humidity sensor, SHT31.

• 0x0213/10=53.1

2.4.3.5 work_min

These 4 bytes (work_min) indicate the duration the current vibration sensor has been active since the latest trigger. See the image below.

• 0x00000000=0

0 means that the current vibration sensor is not triggered.

2.4.4 VIBMOD=4 (FPort=7)

VIBMOD=4 represents the battery voltage and the accelerometer data.

The first two bytes represent the battery voltage, for example 0A F3.

The reset of the bytes represents the accelerometer data on axis X, Y, and Z. Each axis represent in 2 bytes.

X = 0xFC50. In binary, it is represented as 1111110001010000. The highest bit is 1, indicating a negative number in two's complement notation, and its value is -944.

Y=0x0014=20

Z=0x00F6=246

2.5 Integrating with IoT platforms

The LHT65N-VIB sensor data can be integrated with other IoT platforms for better visualizing and analyzing the data. In this section, we will show you how to integrate sensor data from The Things Stack with some popular IoT platforms.

2.5.1 Integrate and show data on ThingsEye

[will be added soon]

2.5.2 Integrate and show data on Datacake

• In the Setup webhook for Datacake page, enter the Webhook ID and Token as shown below. Then select the Create Datacake webhook button.

In the Datacake console (https://datacake.co/) , add LHT65N-VIB as follows.

2.8 LED Indicator

The LHT65 has a tri-color LED for easily indicating different stages.

When the user presses the ACT button, the LED will function according to the LED status linked to the ACT button.

In a normal working state:

• For each uplink, the BLUE or RED LED will blink once:
  • BLUE LED: Indicates an external sensor is connected.
  • RED LED: Indicates no external sensor is connected.
• For each successful downlink, the PURPLE LED will blink once.

2.9 Installation

The LHT65N should be installed vertically on objects, with the sensor parallel to the object's surface.

3. Configure the LHT65N-VIB via AT commands or LoRaWAN downlinks

• Configure via AT Commands: See the FAQ for instructions on How to connect to the LHT65N-VIB's UART interface

• LoRaWAN downlink instructions for different platforms: Refer to the IoT LoRaWAN Server

3.1 Set Transmit Interval Time

Feature: Change the LHT65N-VIB's uplink transmission Interval.

AT Command: AT+TDC

Downlink Command: 0x01

Format: Prefix (0x01) followed by a 3 byte time value.

If the downlink payload is 0100003C, it means set the end node's transmit interval is set to 0x00003C=60(s), where the type code is 01.

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

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

3.2 Set Vibration Sensor Mode

Feature: Sets the Vibration Sensor Mode.

AT Command: AT+VIBMOD

Example 1: AT+VIBMOD=1,60,10

MOD1 will display vib_count and work_min without temperature and humidity. If vibration stops for more than 60 seconds, an alarm message is generated.

If vibration stops for more than 10 seconds, vib_count increases by one, and work_min resets to zero.

 Example 2: AT+VIBMOD=4,1,10

MOD4 sets the collection interval to 10 seconds and collects 1 sets of data in total.

Downlink Command: 0x0A

Format: Prefix (0x0A) followed by a 5 bytes.

Example 1:

• AT+VIBMOD=1,60,10 = 0x0A01003C000A

Example 2:

• AT+VIBMOD=4,1,10 = 0x0A0400010A

3.3 Vibration sensitivity setting

Feature: Allows adjustment of sensitivity settings for different usage scenarios.

AT Command:

Example: AT+VIBSET=0,4,10,12

The acceleration is set to ±2g, and the frequency is 400 Hz. The threshold is set to 10 × 16 mg, meaning a change between 158 and 162 mg can be detected.

If you want to detect an event lasting at least 30 milliseconds, set the register to 30/2.5 = 12 counts. When the time difference between consecutive readings exceeds 12 duration LSBs, an interrupt will be triggered. See the figure below for specific values.

Downlink Command:

The format of the downlink command is as follows:

• Prefix: 0x09
• Acceleration: 2 bytes in hex 
• Frequency: 2 bytes in hex
• Threshold: 2 bytes in hex
• Duration: 2 bytes in hex

The equivalent downlink command for the AT+VIBSET=0,4,10,12 is shown below:

0x0900040A0C

3.4 Set Password

Feature: Set device password, up to 9 digits

AT Command: AT+PWORD

Downlink Command:

There is no downlink command available for this feature.

3.5 Quit AT Command

Feature: Quit AT Command mode, so you need to input the password again before using AT Commands.

AT Command: AT+DISAT

Downlink Command:

There is no downlink command available for this feature.

3.6 Set to sleep mode

Feature: Set device to sleep mode

• AT+SLEEP=0  : Normal working mode. The 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 occurs, and it is used for storage or shipping.

AT Command: AT+SLEEP

Downlink Command:

• There is no downlink command available for this feature.

3.7 Set system time

Feature: Set the system time in UNIX format. See here for format detail.

AT Command:

Downlink Command:

Prefix : 0x30

Time : 5 bytes in hexadecimal 

Example:

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

3.8 Set Time Sync Mode

AT Command:

Downlink Command:

Prefix : 0x28

Example:

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

3.9 Set Time Sync Interval

Feature: Define system time synchronization interval. The default value is 10 days.

AT Command:

Downlink Command:

Prefix: 0x29

Example:

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

3.10 Get data

Feature: Get the current sensor data.

AT Command:

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

3.11 Print data entries base on page

Feature: Print sector data from start page to stop page (max is 416 pages).

AT Command: AT+PDTA

Downlink Command:

There is no downlink command for this feature.

3.12 Print last few data entries

Feature: Print the last few data entries

AT Command: AT+PLDTA

Downlink Command:

There is no downlink command for this feature.

3.13 Clear Flash Record

Feature: Clear the flash storage used by the data log feature.

AT Command: AT+CLRDTA

Downlink Command:

Prefix: 0xA3

Example:

0xA301        //  Same as AT+CLRDTA

3.14 Auto Send None-ACK messages

Feature: LHT65N-VIB will wait for an ACK for each uplink. If LHT65N-VIB doesn't receive an ACK from the network server, it will assume the message didn't reach the server and store it. LHT65N-VIB continues sending messages periodically as usual. Once LHT65N-VIB receives an ACK from the network server, it will assume the network is functioning properly and start sending the messages that haven't arrived.

AT Command: AT+PNACKMD

The default factory setting is 0

Downlink Command: 0x34

Prefix: 0x34

Example:

0x3401       //  Same as AT+PNACKMD=1

4. Batteries

4.1 Battery Type

The minimum working voltage for the LHT65N-VIB is approximately 2.5V. When the battery voltage drops below 2.6V, it's time to replace the battery.

4.2 Replacing Batteries

The LHT65N-VIB has two screws on the back. Unscrew them to remove the battery cover and replace the battery inside. The sensor uses a standard CR17450 battery, and any brand should be suitable.

4.3 Battery Life Analysis

5. FAQ

5.1 How to connect to LHT65N-VIB via UART interface?

The LHT65N-VIB has the UART interface in its Type-C. The UART Interface can be used for

• Send AT Commands, and get output from LHT65N-VIB
• Upgrade firmwre of LHT65N-VIB.

The hardware connection is: PC <--> USB to TTL Adapter <--> Jump wires <--> Type-C Adapter <--> LHT65N-VIB

5.1.1 Options for USB to TTL adapter

• CP2101 USB TTL Adapter
• CH340 USB TTL Adapter
• FT232 USB TTL Adapter

5.1.2 Options for Type-C adapter

Connection:

• USB to TTL GND <--> LHT65N GND
• USB to TTL RXD <--> LHT65N TXD
• USB to TTL TXD <--> LHT65N RXD

5.2.1 AT commands

The 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: Triggers 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+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+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

5.3 How to use Downlink commands?

The following image shows how to send downlink commands (the payloads) from The Things Stack.

5.3.1 The Things Stack

The following image shows how to send downlink commands (the payloads) from Helium.

5.3.2 Helium

5.3.3 ChirpStack

The following image shows how to send downlink commands (the payloads) from ChripStack. The downlink window will not be displayed until the network is accessed.

The following image shows how to send downlink commands (the payloads) from AWS-IOT.

5.3.4 AWS-IoT

5.4 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/ 

5.5 How to upgrade the firmware?

You can change firmware LHT65N-VIB to:

• Change the frequency band/region.
• Add new features.
• Fix bugs. 

The firmware and changelog can be downloaded from : Firmware download link

Methods to Update Firmware:

• Recommanded method: OTA (Over-the-Air) firmware update via wireless. For instructions, visit: http://wiki.dragino.com/xwiki/bin/view/Main/Firmware%20OTA%20Update%20for%20Sensors/
• Alternative Method: Update via UART TTL interface. For instructions, see: Update Instruction.

5.6 Why can't I see the datalog information

1. The time is not aligned, and the correct query command was not used.

2. Decoder error: the datalog data was not parsed, and the data was filtered out.

5.7 How can I read sensor data without LoRaWAN? (For Calibration Purpose)

Some clients need to calibrate the sensor values in a calibration lab. In such cases, reading the data without a LoRaWAN network is more convenient. To achieve this, you can use a USB Type-C breakout board to expose the UART pins while still keeping the probe connected. See below for details. For the pinout, please refer to the FAQ on How to connect LHT65-N via UART interface.

After the UART connection is established, run the commands below:

1. AT+NJM=0   // Set Device to ABP mode , so can works without join to LoRaWAN server.

2. AT+GETSENSORVALUE=0      // The serial port gets the reading of the current sensor.

Example output:

6. Ordering Information

Part Number:  LHT65N-VIB-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

7. Packing Information

The Package Includes:

• LHT65N-VIB LoRaWAN Vibration Sensor  x 1

8. Reference Materials

• Datasheet, photos, decoder, firmware

9. 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.

10. Use Cases

Examples of Practical Applications for LHT65N-VIB.

10.1 Install LHT65N-VIB to detect the number of uses of handwashing stations

Device settings vis AT command: AT+VIBMOD=1,120,5

This means that when the water faucet remains on, a vibration lasting more than 120 seconds will trigger an alarm. When the vibration stops for more than 5 seconds, the vibration count will increase by 1.

• The data begins to rise after 8 o'clock, indicating that the wash basin sensor is working normally.
• During lunch time, from 12 noon to 1:30 PM, the data temporarily levels off but returns to normal operation after.
• At 6 PM, after work hours, the data flattens out, with only a small amount recorded, caused by employees working overtime and using the wash basin.

• Number of wash basin alarms: 14 times
• The rest period is concentrated around 12 o'clock, as people wash their hands during the lunch break.
• The longer duration at 6 o'clock is due to someone needing to turn on the water to clean the toilet.

Sink installation example:
Fix the probe to the water inlet pipe of the sink using a cable tie. Since the vibration in the middle is not as noticeable, and the water outlet on the right is larger than the one on the left, resulting in a larger vibration amplitude, the probe should be installed at the middle of the left water inlet pipe. This way, vibrations can be detected on both sides of the water pipe.

10.2 Install LHT65N-VIB to detect the number of times the toilet is used

Device settings vis AT command: AT+VIBMOD=1,120,5

This means that if the vibration exceeds 120 seconds, an alarm message will be issued. When the vibration stops for more than 5 seconds, the number of vibrations will increase by 1.
When the toilet vibrates for only 100 seconds each time it is flushed, any vibration exceeding 120 seconds would indicate an abnormal situation.

• The data starts to rise after 8 o'clock, indicating that the toilet sensor is working normally.
• The data remains flat with no abnormalities during the lunch break from 12:00 PM to 1:30 PM.
• The data stops rising at 6:00 PM when work is over.

A manual alarm test is performed once at noon.

Toilet installation example:
Fix the probe to the water inlet pipe of the toilet with a wire tie. When the toilet is used, it will pump water, and the LHT65N-VIB will start detecting vibrations in the water pipe. Note: LHT65N-VIB should not be immersed in water. If necessary, ensure it is waterproofed.

10.3 VIBMOD4 detect vibration intensity

Set AT+VIBMOD=4,1,10 to collect a set of XYZ vibration data every ten seconds.

By analyzing the data collected in the graph, we can observe that the vibration amplitude of the machine varies significantly under different working conditions. This monitoring method not only helps to determine in real time whether the machine is operating normally but also allows for the early detection of any abnormal changes in vibration frequency. This, in turn, helps to effectively prevent potential failures and ensures the safe and stable operation of the equipment.