LHT65-PIR Temperature/Humidity/PIR Sensor User Manual

Version 16.1 by Edwin Chen on 2023/04/09 09:09

Table of Contents：

1. Introduction
2. Connect LHT65N-PIR to IoT Server
3. Sensors and Accessories
- 3.1 E2 Extension Cable
4. Configure LHT65N-PIR via AT command or LoRaWAN downlink
5. Battery & Power Consumption
6. OTA firmware update
6. FAQ
7. Order Info
8. Packing Info
9. Reference material
10. FCC Warning

1. Introduction

1.1 What is LHT65N-PIR Temperature,Humidity & PIR Sensor

The Dragino LHT65N-PIR Temperature, Humidity & PIR sensor is a Long Range LoRaWAN Sensor.It includes a built-in Temperature & Humidity sensor and has an external PIR Probe. LHT65N-PIR can detect environment Temperature & Humdity, it also detects People Activity via PIR probe and them send these info to LoRaWAN IoT Server.

The LHT65N-PIR 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.

LHT65N-PIR has a built-in 2400mAh non-chargeable battery which can be used for more than 5 years*.

LHT65N-PIR supports wireless configure & OTA update which make user easy to use.

LHT65N-PIR is fully compatible with LoRaWAN v1.0.3 Class A protocol, it can work with a standard LoRaWAN gateway.

**The actual battery life depends on how often to send data, please see battery analyzer chapter.

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
Support wireless OTA update firmware
Firmware upgradeable via program port
Built-in 2400mAh battery for up to 5 years of use.
Built-in Temperature & Humidity sensor
External PIR Sensor
Tri-color LED to indicate working status

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: < 0.02 °C/yr
Operating Range: 0 ~ 96 %RH

External PIR 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-PIR to IoT Server

2.1 How does LHT65N-PIR work?

LHT65N-PIR is configured as LoRaWAN OTAA Class A sensor by default. Each LHT65N-PIR is shipped with a worldwide unique set of OTAA keys. To use LHT65N-PIR in a LoRaWAN network, first, we need to put the OTAA keys in LoRaWAN Network Server and then activate LHT65N-PIR.

If LHT65N-PIR is within the coverage of this LoRaWAN network. LHT65N-PIR can join the LoRaWAN network automatically. After successfully joining, LHT65N-PIR will start to measure environment temperature, humidity & people activity, and start to transmit sensor data to the LoRaWAN server. The default period for each uplink is 20 minutes.

2.2 How to Activate LHT65N-PIR?

The LHT65N-PIR has two working modes:

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

Working Mode: In this mode, LHT65N-PIR 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-PIR will be in STOP mode (IDLE mode), in STOP mode, the PIR sensor is still working to detect people activity in low power consumption.

The LHT65N-PIR is set in deep sleep mode by default; The ACT button on the front is to switch to different modes:

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.

Assume the LPS8v2 is already set to connect to TTN V3 network, So it provides network coverage for LHT65N-PIR. Next we need to add the LHT65N-PIR device in TTN V3:

2.3.1 Step 1: Create Device n TTN

Create a device in TTN V3 with the OTAA keys from LHT65N-PIR.

Each LHT65N-PIR is shipped with a sticker with its device EUI, APP Key and APP EUI as below:

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

Add APP EUI in the application.

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

Input APP EUI, APP KEY and DEV EUI:

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

Use ACT button to activate LHT65N-PIR and it will auto-join to the TTN V3 network. After join success, it will start to upload sensor data to TTN V3 and user can see in the panel.

2.4 Uplink Payload ( Fport=2)

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.

Size(bytes)	2	2	2	1	4
Value	BAT	Built-In Temperature	Built-in Humidity	Ext #	Ext value

The First 6 bytes: has fix meanings for every LHT65N-PIR.
The 7th byte (EXT #): defines the external sensor model. It can be 0x0A for LHT65N-PIR
The 8^th byte: Alarm Bit (if this uplink is from periodically or movement)
The 9^th ~ 11^st byte: Movement Detect Count.

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-PIR decoder in TTNv3 for friendly reading.

Below is the position to put the decoder and LHT65N-PIR 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-PIR.

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=0x0A, PIR Sensor

2.4.5.2 Ext Value

There are 4 bytes in Ext Value field.

Bit0 of byte 8th shows if this uplink is generate by PIR activity.

The 8^th byte	Bit 1~7	Bit 0
Value	Reserve	0: Normal Uplink 1: Uplink by activity detected

Note: Uplink by activity is disable by default.

The 9^th ~ 11^st byte: Movement Detect Count.

0x00 E5 09 : Total detect 58633 activity since end node start.

2.5 Show data on Datacake

Datacake IoT platform provides a human-friendly interface to show the sensor data, once we have sensor data in TTN V3, we can use Datacake to connect to TTN V3 and see the data in Datacake. Below are the steps:

Step 1: Be sure that your device is programmed and properly connected to the LoRaWAN network.

Step 2: Configure your Application to forward data to Datacake you will need to add integration. Go to TTN V3 Console --> Applications --> Integrations --> Add Integrations.

Add Datacake:

Select default key as Access Key:

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

2.8 LED Indicator

The LHT65N-PIR 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

1. Don't install LHT65N-PIR outdoor or place where will get wet

2. Towards the PIR probe to the place where need to monitor activity.

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-PIR

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

Use can configure LHT65N-E5 via AT Command or LoRaWAN Downlink.

AT Command Connection: See FAQ.

LoRaWAN Downlink instruction for different platforms: IoT LoRaWAN Server

There are two kinds of commands to configure LHT65N-E5, they are:

General Commands.

These commands are to configure:

General system settings like: uplink interval.
LoRaWAN protocol & radio-related commands.

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

Commands special design for LHT65N-E5

These commands are only valid for LHT65N-E5, as below:

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

Command Example	Function	Response
AT+EXT=?	Get or Set external sensor model	5 OK
AT+EXT=5	Set external sensor mode to 5

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.

5. Battery & Power Consumption

LHT65N-PIR use CR17450 battery pack. See below link for detail information about the battery info and how to replace.

Battery Info & Power Consumption Analyze .

6. OTA firmware update

Please see this link for how to do OTA firmware update: http://wiki.dragino.com/xwiki/bin/view/Main/Firmware%20OTA%20Update%20for%20Sensors/

6. FAQ

6.1 How to use AT Command?

LHT65N-E5 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.

In PC, User needs to set serial tool(such as putty, SecureCRT) baud rate to 9600 to access to access serial console for LHT65N-E5. 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.