LDDS75 - LoRaWAN Distance Detection Sensor User Manual

The Dragino LDDS75 is a (% style="color:#4472c4" %)** LoRaWAN Distance Detection Sensor**(%%) for Internet of Things solution. It is used to measure the distance between the sensor and a flat object. The distance detection sensor is a module that uses (% style="color:#4472c4" %)** ultrasonic sensing** (%%)technology for distance measurement, and (% style="color:#4472c4" %)** temperature compensation**(%%) is performed internally to improve the reliability of data. The LDDS75 can be applied to scenarios such as horizontal distance measurement, liquid level measurement, parking management system, object proximity and presence detection, intelligent trash can management system, robot obstacle avoidance, automatic control, sewer, bottom water level monitoring, etc.

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It detects the distance** (% style="color:#4472c4" %) between the measured object and the sensor(%%)**, and uploads the value via wireless to LoRaWAN IoT Server.

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The LoRa wireless technology used in LDDS75 allows device to send data and reach extremely long ranges at low data-rates. It provides ultra-long range spread spectrum communication and high interference immunity whilst minimizing current consumption.

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LDDS75 is powered by (% style="color:#4472c4" %)** 4000mA or 8500mAh Li-SOCI2 battery**(%%); It is designed for long term use up to 10 years*.

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Each LDDS75 pre-loads with a set of unique keys for LoRaWAN registrations, register these keys to local LoRaWAN server and it will auto connect if there is network coverage, after power on.

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(% style="color:#4472c4" %) * (%%)Actually lifetime depends on network coverage and uplink interval and other factors.

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[[image:1654847051249-359.png]]

== 1.2 Features ==

* LoRaWAN 1.0.3 Class A

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* Ultra low power consumption

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* Distance Detection by Ultrasonic technology

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* Flat object range 280mm - 7500mm

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* Accuracy: ±(1cm+S*0.3%) (S: Distance)

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* Cable Length : 25cm

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* Bands: CN470/EU433/KR920/US915/EU868/AS923/AU915/IN865

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* AT Commands to change parameters

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* Uplink on periodically

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* Downlink to change configure

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* IP66 Waterproof Enclosure

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* 4000mAh or 8500mAh Battery for long term use

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== 1.3 Specification ==

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=== 1.3.1 Rated environmental conditions ===

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[[image:image-20220610154839-1.png]]

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**Remarks: (1) a. When the ambient temperature is 0-39 ℃, the maximum humidity is 90% (non-condensing);**

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**b. When the ambient temperature is 40-50 ℃, the highest humidity is the highest humidity in the natural world at the current temperature (no condensation)**

=== 1.3.2 Effective measurement range Reference beam pattern ===

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**(1) The tested object is a white cylindrical tube made of PVC, with a height of 100cm and a diameter of 7.5cm.**

[[image:1654852253176-749.png]]

**(2)** **The object to be tested is a "corrugated cardboard box" perpendicular to the central axis of 0 °, and the length * width is 60cm * 50cm.**

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[[image:1654852175653-550.png]](% style="display:none" %) ** **

== 1.5 Applications ==

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* Horizontal distance measurement

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* Liquid level measurement

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* Parking management system

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* Object proximity and presence detection

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* Intelligent trash can management system

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* Robot obstacle avoidance

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* Automatic control

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* Sewer

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* Bottom water level monitoring

== 1.6 Pin mapping and power on ==

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[[image:1654847583902-256.png]]

= 2. Configure LDDS75 to connect to LoRaWAN network =

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== 2.1 How it works ==

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The LDDS75 is configured as LoRaWAN OTAA Class A mode by default. It has OTAA keys to join LoRaWAN network. To connect a LoRaWAN network, you need to input the OTAA keys in the LoRaWAN IoT server and power on the LDDS75. If there is coverage of the LoRaWAN network, it will automatically join the network via OTAA and start to send the sensor value

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In case you can't set the OTAA keys in the LoRaWAN OTAA server, and you have to use the keys from the server, you can [[use AT Commands >>||anchor="H3.A0ConfigureLDDS75viaATCommandorLoRaWANDownlink"]]to set the keys in the LDDS75.

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== 2.2 Quick guide to connect to LoRaWAN server (OTAA) ==

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Following is an example for how to join the [[TTN v3 LoRaWAN Network>>url:https://console.cloud.thethings.network/]]. Below is the network structure; we use the [[LG308>>url:http://www.dragino.com/products/lora/item/140-lg308.html]] as a LoRaWAN gateway in this example.

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[[image:1654848616367-242.png]]

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The LG308 is already set to connected to [[TTN network >>url:https://console.cloud.thethings.network/]], so what we need to now is configure the TTN server.

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(% style="color:blue" %)**Step 1**(%%): Create a device in TTN with the OTAA keys from LDDS75.

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Each LDDS75 is shipped with a sticker with the default device keys, user can find this sticker in the box. it looks like below.

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[[image:image-20220607170145-1.jpeg]]

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For OTAA registration, we need to set **APP EUI/ APP KEY/ DEV EUI**. Some server might no need to set APP EUI.

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Enter these keys in the LoRaWAN Server portal. Below is TTN V3 screen shot:

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**Add APP EUI in the application**

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[[image:image-20220610161353-4.png]]

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[[image:image-20220610161353-5.png]]

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[[image:image-20220610161353-6.png]]

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[[image:image-20220610161353-7.png]]

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You can also choose to create the device manually.

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[[image:image-20220610161538-8.png]]

**Add APP KEY and DEV EUI**

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[[image:image-20220610161538-9.png]]

(% style="color:blue" %)**Step 2**(%%): Power on LDDS75

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Put a Jumper on JP2 to power on the device. ( The Switch must be in FLASH position).

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[[image:image-20220610161724-10.png]]

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(% style="color:blue" %)**Step 3**(%%)**:** The LDDS75 will auto join to the TTN network. After join success, it will start to upload messages to TTN and you can see the messages in the panel.

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[[image:1654849068701-275.png]]

== 2.3 Uplink Payload ==

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LDDS75 will uplink payload via LoRaWAN with below payload format:

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Uplink payload includes in total 4 bytes.

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Payload for firmware version v1.1.4. . Before v1.1.3, there is on two fields: BAT and Distance

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(% border="1" cellspacing="10" style="background-color:#ffffcc; width:510px" %)

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|=(% style="width: 62.5px;" %)(((

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**Size (bytes)**

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)))|=(% style="width: 62.5px;" %)**2**|=**2**|=1|=2|=**1**

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|(% style="width:62.5px" %)**Value**|(% style="width:62.5px" %)[[BAT>>||anchor="H2.3.1A0BatteryInfo"]]|(((

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[[Distance>>||anchor="H2.3.2A0Distance"]]

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(unit: mm)

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)))|[[Digital Interrupt (Optional)>>||anchor="H2.3.3A0InterruptPin"]]|(((

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[[Temperature (Optional )>>||anchor="H2.3.4A0DS18B20Temperaturesensor"]]

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)))|[[Sensor Flag>>||anchor="H2.3.5A0SensorFlag"]]

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[[image:1654850511545-399.png]]

=== 2.3.1 Battery Info ===

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Check the battery voltage for LDDS75.

Ex1: 0x0B45 = 2885mV

Ex2: 0x0B49 = 2889mV

=== 2.3.2 Distance ===

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Get the distance. Flat object range 280mm - 7500mm.

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For example, if the data you get from the register is 0x0B 0x05, the distance between the sensor and the measured object is(% style="color:#4472c4" %)** 0B05(H) = 2821 (D) = 2821 mm.**

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* If the sensor value is 0x0000, it means system doesn’t detect ultrasonic sensor.

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* If the sensor value lower than 0x0118 (280mm), the sensor value will be invalid. Since v1.1.4, all value lower than 280mm will be set to 0x0014(20mm) which means the value is invalid.

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=== 2.3.3 Interrupt Pin ===

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This data field shows if this packet is generated by interrupt or not. [[Click here>>||anchor="H3.3A0SetInterruptMode"]] for the hardware and software set up.

**Example:**

0x00: Normal uplink packet.

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0x01: Interrupt Uplink Packet.

=== 2.3.4 DS18B20 Temperature sensor ===

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This is optional, user can connect external DS18B20 sensor to the +3.3v, 1-wire and GND pin . and this field will report temperature.

**Example**:

If payload is: 0105H: (0105 & FC00 == 0), temp = 0105H /10 = 26.1 degree

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If payload is: FF3FH : (FF3F & FC00 == 1) , temp = (FF3FH - 65536)/10 = -19.3 degrees.

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(% style="color:red" %)Note: DS18B20 feature is supported in the hardware version > v1.3 which made since early of 2021.

=== 2.3.5 Sensor Flag ===

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0x01: Detect Ultrasonic Sensor

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0x00: No Ultrasonic Sensor

=== 2.3.6 Decode payload in The Things Network ===

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While using TTN network, you can add the payload format to decode the payload.

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[[image:1654850829385-439.png]]

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The payload decoder function for TTN V3 is here:

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LDDS75 TTN V3 Payload Decoder: [[http:~~/~~/www.dragino.com/downloads/index.php?dir=LoRa_End_Node/LDDS75/Payload_Decoder/>>url:http://www.dragino.com/downloads/index.php?dir=LoRa_End_Node/LSE01/Payload_Decoder/]]

== 2.4 Uplink Interval ==

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The LDDS75 by default uplink the sensor data every 20 minutes. User can change this interval by AT Command or LoRaWAN Downlink Command. See this link: [[Change Uplink Interval>>doc:Main.End Device AT Commands and Downlink Command.WebHome||anchor="H4.1ChangeUplinkInterval"]]

== 2.5 Show Data in DataCake IoT Server ==

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[[DATACAKE>>url:https://datacake.co/]] provides a human friendly interface to show the sensor data, once we have data in TTN, we can use [[DATACAKE>>url:https://datacake.co/]] to connect to TTN and see the data in DATACAKE. Below are the steps:

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(% style="color:blue" %)**Step 1**(%%)**: Be sure that your device is programmed and properly connected to the network at this time.**

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(% style="color:blue" %)**Step 2**(%%)**: To configure the Application to forward data to DATACAKE you will need to add integration. To add the DATACAKE integration, perform the following steps:**

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[[image:1654592790040-760.png]]

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[[image:1654592800389-571.png]]

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(% style="color:blue" %)**Step 3**(%%)**: Create an account or log in Datacake.**

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(% style="color:blue" %)**Step 4**(%%)**: Search the LDDS75 and add DevEUI.**

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[[image:1654851029373-510.png]]

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After added, the sensor data arrive TTN V3, it will also arrive and show in Datacake.

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[[image:image-20220610165129-11.png||height="595" width="1088"]]

== 2.6 Frequency Plans ==

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The LDDS75 uses OTAA mode and below frequency plans by default. If user want to use it with different frequency plan, please refer the AT command sets.

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=== 2.6.1 EU863-870 (EU868) ===

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(% style="color:blue" %)**Uplink:**

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868.1 - SF7BW125 to SF12BW125

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868.3 - SF7BW125 to SF12BW125 and SF7BW250

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868.5 - SF7BW125 to SF12BW125

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867.1 - SF7BW125 to SF12BW125

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867.3 - SF7BW125 to SF12BW125

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867.5 - SF7BW125 to SF12BW125

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867.7 - SF7BW125 to SF12BW125

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867.9 - SF7BW125 to SF12BW125

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868.8 - FSK

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(% style="color:blue" %)**Downlink:**

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Uplink channels 1-9 (RX1)

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869.525 - SF9BW125 (RX2 downlink only)

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=== 2.6.2 US902-928(US915) ===

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Used in USA, Canada and South America. Default use CHE=2

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(% style="color:blue" %)**Uplink:**

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903.9 - SF7BW125 to SF10BW125

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904.1 - SF7BW125 to SF10BW125

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904.3 - SF7BW125 to SF10BW125

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904.5 - SF7BW125 to SF10BW125

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904.7 - SF7BW125 to SF10BW125

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904.9 - SF7BW125 to SF10BW125

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905.1 - SF7BW125 to SF10BW125

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905.3 - SF7BW125 to SF10BW125

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(% style="color:blue" %)**Downlink:**

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923.3 - SF7BW500 to SF12BW500

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923.9 - SF7BW500 to SF12BW500

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924.5 - SF7BW500 to SF12BW500

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925.1 - SF7BW500 to SF12BW500

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925.7 - SF7BW500 to SF12BW500

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926.3 - SF7BW500 to SF12BW500

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926.9 - SF7BW500 to SF12BW500

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927.5 - SF7BW500 to SF12BW500

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923.3 - SF12BW500(RX2 downlink only)

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=== 2.6.3 CN470-510 (CN470) ===

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Used in China, Default use CHE=1

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(% style="color:blue" %)**Uplink:**

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486.3 - SF7BW125 to SF12BW125

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486.5 - SF7BW125 to SF12BW125

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486.7 - SF7BW125 to SF12BW125

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486.9 - SF7BW125 to SF12BW125

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487.1 - SF7BW125 to SF12BW125

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487.3 - SF7BW125 to SF12BW125

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487.5 - SF7BW125 to SF12BW125

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487.7 - SF7BW125 to SF12BW125

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(% style="color:blue" %)**Downlink:**

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506.7 - SF7BW125 to SF12BW125

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506.9 - SF7BW125 to SF12BW125

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507.1 - SF7BW125 to SF12BW125

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507.3 - SF7BW125 to SF12BW125

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507.5 - SF7BW125 to SF12BW125

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507.7 - SF7BW125 to SF12BW125

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507.9 - SF7BW125 to SF12BW125

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508.1 - SF7BW125 to SF12BW125

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505.3 - SF12BW125 (RX2 downlink only)

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=== 2.6.4 AU915-928(AU915) ===

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Default use CHE=2

(% style="color:blue" %)**Uplink:**

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916.8 - SF7BW125 to SF12BW125

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917.0 - SF7BW125 to SF12BW125

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917.2 - SF7BW125 to SF12BW125

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917.4 - SF7BW125 to SF12BW125

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917.6 - SF7BW125 to SF12BW125

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917.8 - SF7BW125 to SF12BW125

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918.0 - SF7BW125 to SF12BW125

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918.2 - SF7BW125 to SF12BW125

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(% style="color:blue" %)**Downlink:**

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923.3 - SF7BW500 to SF12BW500

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923.9 - SF7BW500 to SF12BW500

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924.5 - SF7BW500 to SF12BW500

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925.1 - SF7BW500 to SF12BW500

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925.7 - SF7BW500 to SF12BW500

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926.3 - SF7BW500 to SF12BW500

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926.9 - SF7BW500 to SF12BW500

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927.5 - SF7BW500 to SF12BW500

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923.3 - SF12BW500(RX2 downlink only)

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=== 2.6.5 AS920-923 & AS923-925 (AS923) ===

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(% style="color:blue" %)**Default Uplink channel:**

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923.2 - SF7BW125 to SF10BW125

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923.4 - SF7BW125 to SF10BW125

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(% style="color:blue" %)**Additional Uplink Channel**:

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(OTAA mode, channel added by JoinAccept message)

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(% style="color:blue" %)**AS920~~AS923 for Japan, Malaysia, Singapore**:

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922.2 - SF7BW125 to SF10BW125

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922.4 - SF7BW125 to SF10BW125

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922.6 - SF7BW125 to SF10BW125

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922.8 - SF7BW125 to SF10BW125

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923.0 - SF7BW125 to SF10BW125

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922.0 - SF7BW125 to SF10BW125

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(% style="color:blue" %)**AS923 ~~ AS925 for Brunei, Cambodia, Hong Kong, Indonesia, Laos, Taiwan, Thailand, Vietnam**:

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923.6 - SF7BW125 to SF10BW125

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923.8 - SF7BW125 to SF10BW125

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924.0 - SF7BW125 to SF10BW125

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924.2 - SF7BW125 to SF10BW125

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924.4 - SF7BW125 to SF10BW125

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924.6 - SF7BW125 to SF10BW125

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(% style="color:blue" %)**Downlink:**

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Uplink channels 1-8 (RX1)

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923.2 - SF10BW125 (RX2)

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=== 2.6.6 KR920-923 (KR920) ===

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(% style="color:blue" %)**Default channel:**

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922.1 - SF7BW125 to SF12BW125

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922.3 - SF7BW125 to SF12BW125

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922.5 - SF7BW125 to SF12BW125

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(% style="color:blue" %)**Uplink: (OTAA mode, channel added by JoinAccept message)**

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922.1 - SF7BW125 to SF12BW125

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922.3 - SF7BW125 to SF12BW125

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922.5 - SF7BW125 to SF12BW125

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922.7 - SF7BW125 to SF12BW125

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922.9 - SF7BW125 to SF12BW125

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923.1 - SF7BW125 to SF12BW125

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923.3 - SF7BW125 to SF12BW125

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(% style="color:blue" %)**Downlink:**

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Uplink channels 1-7(RX1)

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921.9 - SF12BW125 (RX2 downlink only; SF12BW125 might be changed to SF9BW125)

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=== 2.6.7 IN865-867 (IN865) ===

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(% style="color:blue" %)**Uplink:**

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865.0625 - SF7BW125 to SF12BW125

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865.4025 - SF7BW125 to SF12BW125

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865.9850 - SF7BW125 to SF12BW125

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(% style="color:blue" %)**Downlink:**

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Uplink channels 1-3 (RX1)

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866.550 - SF10BW125 (RX2)

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== 2.7 LED Indicator ==

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The LDDS75 has an internal LED which is to show the status of different state.

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* Blink once when device power on.

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* The device detects the sensor and flashes 5 times.

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* Solid ON for 5 seconds once device successful Join the network.

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* Blink once when device transmit a packet.

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== 2.8 Firmware Change Log ==

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**Firmware download link: **[[http:~~/~~/www.dragino.com/downloads/index.php?dir=LoRa_End_Node/LSE01/Firmware/>>url:http://www.dragino.com/downloads/index.php?dir=LoRa_End_Node/LSE01/Firmware/]]

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**Firmware Upgrade Method: **[[Firmware Upgrade Instruction>>doc:Main.Firmware Upgrade Instruction for STM32 base products.WebHome]]

== 2.9 Mechanical ==

[[image:image-20220610172003-1.png]]

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[[image:image-20220610172003-2.png]]

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== 2.10 Battery Analysis ==

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=== 2.10.1 Battery Type ===

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The LDDS75 battery is a combination of a 4000mAh or 8500mAh Li/SOCI2 Battery and a Super Capacitor. The battery is non-rechargeable battery type with a low discharge rate (<2% per year). This type of battery is commonly used in IoT devices such as water meter.

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The battery related documents as below:

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[[ Battery Dimension>>url:http://www.dragino.com/downloads/index.php?dir=datasheet/Battery/&file=LSN50-Battery-Dimension.pdf]],

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[[Lithium-Thionyl Chloride Battery datasheet>>url:https://www.dragino.com/downloads/downloads/datasheet/Battery/ER26500/ER26500_Datasheet-EN.pdf]],

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[[Lithium-ion Battery-Capacitor datasheet>>url:http://www.dragino.com/downloads/downloads/datasheet/Battery/SPC_1520_datasheet.jpg]], [[Tech Spec>>url:http://www.dragino.com/downloads/downloads/datasheet/Battery/SPC1520%20Technical%20Specification20171123.pdf]]

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[[image:image-20220610172400-3.png]]

=== 2.10.2 Replace the battery ===

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You can change the battery in the LDDS75.The type of battery is not limited as long as the output is between 3v to 3.6v. On the main board, there is a diode (D1) between the battery and the main circuit. If you need to use a battery with less than 3.3v, please remove the D1 and shortcut the two pads of it so there won’t be voltage drop between battery and main board.

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The default battery pack of LDDS75 includes a ER18505 plus super capacitor. If user can’t find this pack locally, they can find ER18505 or equivalence, which will also work in most case. The SPC can enlarge the battery life for high frequency use (update period below 5 minutes)

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= 3. Configure LDDS75 via AT Command or LoRaWAN Downlink =

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Use can configure LDDS75 via AT Command or LoRaWAN Downlink.

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AT Command Connection: See [[FAQ>>||anchor="H7.A0FAQ"]].

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LoRaWAN Downlink instruction for different platforms: [[IoT LoRaWAN Server>>doc:Main.WebHome]]

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There are two kinds of commands to configure LDDS75, they are:

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(% style="color:#4f81bd" %)** General Commands**.

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These commands are to configure:

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General system settings like: uplink interval.

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LoRaWAN protocol & radio related command.

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They are same for all Dragino Device which support DLWS-005 LoRaWAN Stack. These commands can be found on the wiki: [[End Device AT Commands and Downlink Command>>doc:Main.End Device AT Commands and Downlink Command.WebHome]]

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(% style="color:#4f81bd" %)** Commands special design for LDDS75**

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These commands only valid for LDDS75, as below:

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== 3.1 Access AT Commands ==

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LDDS75 supports AT Command set in the stock firmware. You can use a USB to TTL adapter to connect to LDDS75 for using AT command, as below.

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[[image:image-20220610172924-4.png||height="483" width="988"]]

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Or if you have below board, use below connection:

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[[image:image-20220610172924-5.png]]

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In the PC, you need to set the serial baud rate to (% style="color:green" %)**9600**(%%) to access the serial console for LDDS75. LDDS75 will output system info once power on as below:

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[[image:image-20220610172924-6.png||height="601" width="860"]]

== 3.2 Set Transmit Interval Time ==

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Feature: Change LoRaWAN End Node Transmit Interval.

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(% style="color:#037691" %)**AT Command: AT+TDC**

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[[image:image-20220610173409-7.png]]

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(% style="color:#037691" %)**Downlink Command: 0x01**

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

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

988

989

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

990

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

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== 3.3 Set Interrupt Mode ==

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Feature, Set Interrupt mode for GPIO_EXIT.

1000

1001

(% style="color:#037691" %)**Downlink Command: AT+INTMOD**

1002

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[[image:image-20220610174917-9.png]]

1004

1005

1006

(% style="color:#037691" %)**Downlink Command: 0x06**

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1008

Format: Command Code (0x06) followed by 3 bytes.

1009

1010

This means that the interrupt mode of the end node is set to 0x000003=3 (rising edge trigger), and the type code is 06.

1011

1012

* Example 1: Downlink Payload: 06000000 ~/~/ Turn off interrupt mode

1013

* Example 2: Downlink Payload: 06000003 ~/~/ Set the interrupt mode to rising edge trigger

= 4. FAQ =

== 4.1 What is the frequency plan for LDDS75? ==

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1019

LDDS75 use the same frequency as other Dragino products. User can see the detail from this link: [[Introduction>>doc:Main.End Device Frequency Band.WebHome||anchor="H1.Introduction"]]

== 4.2 How to change the LoRa Frequency Bands/Region ==

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You can follow the instructions for [[how to upgrade image>>||anchor="H2.8A0200BFirmwareChangeLog"]].

1026

When downloading the images, choose the required image file for download.

== 4.3 Can I use LDDS75 in condensation environment? ==

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LDDS75 is not suitable to be used in condensation environment. Condensation on the LDDS75 probe will affect the reading and always got 0.

= 5. Trouble Shooting =

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== 5.1 Why I can’t join TTN V3 in US915 / AU915 bands? ==

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1040

It is due to channel mapping. Please see below link: [[Frequency band>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H2.NoticeofUS9152FCN4702FAU915Frequencyband"]]

1041

1042

1043

== 5.2 AT Command input doesn't work ==

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1045

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 (% style="color:green" %)**ENTER**(%%) while sending out the command. Some serial tool doesn’t send (% style="color:green" %)**ENTER**(%%) while press the send key, user need to add ENTER in their string.

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= 6. Order Info =

Part Number **:** (% style="color:blue" %)**LDDS75-XX-YY**

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(% style="color:blue" %)**XX**(%%)**: **The default frequency band

1059

1060

* (% style="color:red" %)**AS923 **(%%)**:** LoRaWAN AS923 band

1061

* (% style="color:red" %)**AU915 **(%%)**:** LoRaWAN AU915 band

1062

* (% style="color:red" %)**EU433 **(%%)**:** LoRaWAN EU433 band

1063

* (% style="color:red" %)**EU868 **(%%)**:** LoRaWAN EU868 band

1064

* (% style="color:red" %)**KR920 **(%%)**:** LoRaWAN KR920 band

1065

* (% style="color:red" %)**US915 **(%%)**:** LoRaWAN US915 band

1066

* (% style="color:red" %)**IN865 **(%%)**:** LoRaWAN IN865 band

1067

* (% style="color:red" %)**CN470 **(%%)**:** LoRaWAN CN470 band

1068

1069

(% style="color:blue" %)**YY**(%%): Battery Option

1070

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* (% style="color:red" %)**4 **(%%)**: **4000mAh battery

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* (% style="color:red" %)**8 **(%%)**:** 8500mAh battery

= 7. Packing Info =

**Package Includes**:

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* LDDS75 LoRaWAN Distance Detection Sensor x 1

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**Dimension and weight**:

* Device Size: cm

* Device Weight: g

* Package Size / pcs : cm

* Weight / pcs : g

= 8. 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.

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* 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>>url:http://../../../../../../D:%5C%E5%B8%82%E5%9C%BA%E8%B5%84%E6%96%99%5C%E8%AF%B4%E6%98%8E%E4%B9%A6%5CLoRa%5CLT%E7%B3%BB%E5%88%97%5Csupport@dragino.com]].

Wiki source code of LDDS75 - LoRaWAN Distance Detection Sensor User Manual