LMDS200 - LoRaWAN Microwave Radar Distance Sensor User Manual

The Dragino LMDS200 is a (% style="color:#4472c4" %)**LoRaWAN Microwave Radar distance sensor**(%%). It uses (% style="color:#4472c4" %)**24Ghz Microwave**(%%) to detect the distance between sensor and different objects. Compare vs ultrasonic or Lidar measurement method, Microwave Radar is (% style="color:#4472c4" %)**more reliable for condensation / dusty environment**(%%). It can sense correct distance even there is water or thick dust on top of the sensor.

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The LMDS200 can be applied to scenarios such as horizontal distance measurement, parking management system, object proximity and presence detection, intelligent trash can management system, robot obstacle avoidance, automatic control, sewer, etc.

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LMDS200 can (% style="color:#4472c4" %)**measure two distances**(%%): the closest object and next object behind the closest one.

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LMDS200 supports (% style="color:#4472c4" %)**Alarm Feature**(%%), user can set the LMDS200 to uplink data in a short interval when the distance is out of configured range.

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The LoRa wireless technology used in LMDS200 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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LMDS200 is powered by 8500mAh Li-SOCI2 battery, it is designed for long term use up to 5 years.

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Each LMDS200 is pre-load with a set of unique keys for LoRaWAN registrations, register these keys to local LoRaWAN server and it will auto connect after power on.

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*Battery life depends on how often to send data, please see [[battery analyzer>>||anchor="H4. Battery & how to replace"]].

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[[image:1655277036890-950.png]]

== 1.2 Features ==

* LoRaWAN 1.0.3 Class A

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* Ultra-low power consumption

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* Microwave Radar for distance detection

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* Short uplink interval for Distance Alarm

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* Monitor Battery Level

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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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* 8500mAh Battery for long term use

* Wall Mountable

* Outdoor Use

== 1.3 Radar probe specification ==

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* Measuring Method: FMCW

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* Frequency: 24.000 ~~ 24.500 GHz

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* Measurement output power: 6dBm

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* Measure range: 0.5 ~~ 20m

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* Accuracy: ±0.1m

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* Resolution: 0.01m

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* Horizontal Angel: 78°

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* Vertical Angel: 23°

== 1.4 Storage & Operation Temperature ==

-20°C to +85°C

== 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 Installation ==

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Sensor measure direction and angle is as below. When install the sensor, please make sure the sensor direct to object.

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[[image:image-20220615152454-3.png]]

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[[image:image-20220615152454-4.png]]

== 1.7 Pin mapping and power on ==

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[[image:1655257026882-201.png]]

= 2. Operation Mode =

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== 2.1 How it works ==

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Each LMDS200 is shipped with a worldwide unique set of OTAA keys. To use LMDS200 in a LoRaWAN network, user needs to input the OTAA keys in the LoRaWAN network server. So LMDS200 can join the LoRaWAN network and start to transmit sensor data.

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== 2.2 Example to use for LoRaWAN network ==

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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:1655278047781-517.png]]

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* In this user case, the LMDS200 is installed on top of river to detect the water level and send the level info to the LoRaWAN server. The LMDS200 will uplink different types of messages to the LoRaWAN server. See [[Uplink payload>>path:#Uplink_Payload]] for detail.

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Assume the LoRaWAN Gateway DLOS8 is already set to connect to the [[TTN V3 network >>url:https://eu1.cloud.thethings.network]]. We need to add the LMDS200 device in TTN V3:

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(% style="color:blue" %)**Step 1**(%%): Create a device in TTN with the OTAA keys from LMDS200.

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Each LMDS200 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:1655278302970-688.png]]

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

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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]]

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:1655278497961-944.png]]

(% style="color:blue" %)**Step 2**(%%): Power on LMDS200

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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:1655278589727-228.png]]

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Put the jumper to power on LMDS200 and it will auto-join to the TTN V3 network. After join success, it will start to upload sensor data to TTN V3 and the user can see it in the panel.

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== 2.3 Uplink Payload ==

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Uplink payloads have two types:

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* Distance Value: Use FPORT=2

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* Other control commands: Use other FPORT fields.

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The application server should parse the correct value based on FPORT settings.

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=== 2.3.1 Device Status, FPORT~=5 ===

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Include device configure status. Once LMDS200 Joined the network, it will uplink this message to the server.

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Users can also use the downlink command (0x26 01) to ask LMDS200 to resend Device Status.

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[[image:image-20220615154327-2.png]]

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[[image:image-20220615154022-1.png]](% style="display:none" %)

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* (% style="color:#037691" %)**Sensor Model**(%%)**:** For LMDS200, this value is 0x0C

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* (% style="color:#037691" %)**Firmware Version**(%%)**:** 0x0100, Means: v1.0.0 version

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* (% style="color:#037691" %)**Frequency Band**(%%)**:**

*0x01: EU868

*0x02: US915

*0x03: IN865

*0x04: AU915

*0x05: KZ865

*0x06: RU864

*0x07: AS923

*0x08: AS923-1

*0x09: AS923-2

*0x0a: AS923-3

*0x0b: CN470

*0x0c: EU433

*0x0d: KR920

*0x0e: MA869

* (% style="color:#037691" %)**Sub-Band**(%%)**:**

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** AU915 and US915:value 0x00 ~~ 0x08

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** CN470: value 0x0B ~~ 0x0C

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** Other Bands: Always 0x00

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* (% style="color:#037691" %)**Battery Info:**

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Check the battery voltage.

Ex1: 0x0B45 = 2885mV

Ex2: 0x0B49 = 2889mV

=== 2.3.2 Sensor Configuration, FPORT~=4 ===

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LMDS200 will only send this command after getting the downlink command (0x26 02) from the server.

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(% border="1" cellspacing="10" style="background-color:#ffffcc; width:494px" %)

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|(% colspan="5" style="width:491px" %)**Sensor Configuration FPORT=4**

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|**Value**|(% style="width:84px" %)(((

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[[TDC (unit:sec)>>||anchor="H"]]

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[[ATDC (unit:min)>>||anchor="H"]]

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)))|(% style="width:117px" %)[[Alarm Settings>>||anchor="H"]]|(% style="width:136px" %)[[Interrupt Settings>>||anchor="H"]]

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[[image:1655279779620-413.png]]

=== 2.3.3 Distance, Uplink FPORT~=2 ===

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LMDS200 will send this uplink **after** Device Status once join the LoRaWAN network successfully. And LMDS200 will:

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1. periodically send this uplink every 1 hour (TDC time), this interval [[can be changed>>||anchor="H"]].

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1. periodically send this uplink every 1 minute in Alarm Mode.

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1. send this uplink while there is [[interrupt event>>||anchor="H"]].

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Uplink Payload totals 11 bytes.

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(% border="1" cellspacing="10" style="background-color:#ffffcc; width:508px" %)

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|(% colspan="5" style="width:505px" %)**Distance Value, FPORT=2**

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|(% style="width:72px" %)**Value**|(% style="width:43px" %)[[BAT>>path:#bat]]|(% style="width:134px" %)Object1 Distance|(% style="width:134px" %)Object2 Distance|(% style="width:121px" %)Status & [[Alarm>>path:#Alarm_Timeout]]

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[[image:image-20220615161345-5.png]]

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[[image:image-20220615160828-3.png]]

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(% style="color:#037691" %)** Object1 Distance:**

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Distance between sensor probe to the first object. (unit: cm)

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For example, if the data you get from the register is __0x00 0x73__, the distance between the sensor and the measured object is(% style="color:#037691" %)** 0073(H) = 115 (D) = 115 cm.**

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(% style="color:red" %)Notice: There are two special values for object 1 distance:

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**0x0001**: Probe not detected

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**0x0002**: Reading Invalid (exceed the valid range of the probe)

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(% style="color:#037691" %)**Object2 Distance:**

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Distance between sensor probe to the second object. (unit: cm)

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DALARM Counter : Alarm Counter.

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[[image:image-20220615160828-4.png]]

=== 2.3.4 Decoder in TTN V3 ===

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[[image:1655261164557-670.png]]

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Please check the decoder from this link:

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[[https:~~/~~/www.dragino.com/downloads/index.php?dir=LoRa_End_Node/LMDS200/payload_decode/>>url:https://www.dragino.com/downloads/index.php?dir=LoRa_End_Node/LDS03A/payload_decode/]]

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== 2.4 Show data on Datacake ==

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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:

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(% style="color:blue" %)**Step 1**(%%)**: **Link TTNv3 to [[DATACAKE>>url:https://datacake.co/]]

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(% style="color:blue" %)**Step 2**(%%)**: **Configure LMDS200 in Datacake

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[[image:image-20220615163646-6.png]]

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[[image:image-20220615163646-7.png]]

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[[image:image-20220615163646-8.png]]

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[[image:image-20220615163646-9.png||height="392" width="1211"]]

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[[image:image-20220615163646-10.png]]

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(% style="display:none" %) (%%)

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[[image:image-20220615163646-11.png||height="434" width="1206"]](% style="display:none" %)

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[[image:image-20220615163646-12.png||height="357" width="1202"]](% style="display:none" %)

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(% style="display:none" %) (%%)

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[[image:image-20220615163646-13.png]](% style="display:none" %)

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[[image:image-20220615163646-14.png]]

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[[image:image-20220615163646-15.png]](% style="display:none" %)

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(% style="display:none" %) (%%)

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= 3. Configure LMDS200 via AT Command or LoRaWAN Downlink =

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Use can configure LMDS200 via AT Command or LoRaWAN Downlink.

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AT Command Connection: See [[FAQ>>||anchor="H5.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 LMDS200, 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**(Note~*~*)**. 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 LMDS200**

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These commands only valid for LMDS200, as below:

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== 3.1 Set Transmit Interval Time(0x01) ==

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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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(% aria-label="image-20220610173409-7.png image widget" contenteditable="false" role="region" tabindex="-1" %)[[image:image-20220610173409-7.png||data-widget="image"]](% title="Click and drag to resize" %)(% aria-label="Data URI image image widget" contenteditable="false" role="region" style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220,220,220,0.5); display:none" tabindex="-1" %)[[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||data-widget="image" draggable="true" height="15" role="presentation" title="Click and drag to move" width="15"]](% aria-label="Data URI image image widget" contenteditable="false" role="region" style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220, 220, 220, 0.5); display:none" tabindex="-1" %)[[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||draggable="true" height="15" role="presentation" title="Click and drag to move" width="15"]](% aria-label="Data URI image image widget" contenteditable="false" role="region" style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220,220,220,0.5); display:none" tabindex="-1" title="Click and drag to resize" %)(% title="Click and drag to resize" %)

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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.

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

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

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== 3.2 Set Alarm Transmit Interval Time(0x0D) ==

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Feature: Change LoRaWAN End Node Alarm Transmit Interval. Default Value: 1 minute

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

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|**Command Example**|**Function**|**Response**

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|AT+ATDC?|Show current alarm transmit Interval|(((

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OK

the interval is 1 minute

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|AT+ATDC=1|Set Alarm Transmit Interval|(((

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OK

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Set alarm transmit interval to 1 min

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**(% style="color:#037691" %)Downlink Command: 0x0D**

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Format: Command Code (0x0D) followed by 1 byte for time value.

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If the downlink payload=0D02, it means set the END Node’s Alarm Transmit Interval to 2 minutes, while type code is 0D.

== 3.3 Set Alarm Distance (0xA2) ==

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LMDS02 supports Alarm Feature, when LMDS02 detect the distance exceed the alarm settings, LMDS02 will Enter Alarm Mode and use the [[ATDC interval>>path:#Alarm_Interval]] (default is 1 minute) to uplink Distance value. Alarm mode will last for 60 uplinks (default 1 hour) and can be close by downlink command 0xA300.

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Note: Alarm mode only valid for the Distance 1(the Closest Object)

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User can set Alarm Distance to enable/disable Alarm Mode.

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**(% style="color:#037691" %)AT+ALARMC=AABBCCDD**

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* AABB: Hex value for Alarm low threshold, CCDD: Hex value for Alarm high threshold

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* When 0xAABB=0, and 0xCCDD≠0, Alarm trigger when higher than max

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* When 0xAABB≠0, and 0xCCDD =0xFFFF, Alarm trigger when lower than min

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* When 0xAABB≠0 and 0xCCDD≠0, Alarm trigger when higher than max or lower than min

Example:

AT+ALARMC=006400C8 ~/~/ Alarm when < 100 or higher than 200.

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* (% style="color:#037691" %)Downlink Payload:

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0x(A2 00 01 00 00) ~/~/ Same as AT+ALARMC=00010000

== 3.4 Enter/Exit Alarm Mode (0xA3) ==

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Feature: Enter/Exit Alarm mode:

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**(% style="color:#037691" %)AT Command: AT+ALARM=0(Exit Alarm Mode or AT+ALARM=1 (Enter Alarm Mode)**

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

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0xA3 00 ~/~/ Exit Alarm Mode.

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0xA3 01 ~/~/ Enter Alarm Mode. Enter Alarm mode will use ATDC interval in the next 59 uplinks.

== 3.5 Set Interrupt Mode(0x06) ==

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Feature, Set Interrupt mode for GPIO_EXIT.

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

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

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

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

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

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

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

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== 4. Battery & how to replace ==

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=== 4.1 Battery Type ===

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LMDS200 is equipped with a [[8500mAH ER26500 Li-SOCI2 battery>>url:https://www.dragino.com/downloads/index.php?dir=datasheet/Battery/ER26500/]]. 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.

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The discharge curve is not linear so can’t simply use percentage to show the battery level. Below is the battery performance.

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[[image:image-20220615165029-16.png||height="645" width="908"]]

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Minimum Working Voltage for the LMDS200:

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LMDS200: 2.45v ~~ 3.6v

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The battery related documents as below:

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[[Battery Dimension>>https://www.dragino.com/downloads/index.php?dir=datasheet/Battery/ER26500/]],

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[[Lithium-Thionyl Chloride Battery datasheet>>https://www.dragino.com/downloads/index.php?dir=datasheet/Battery/ER26500/]],

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[[Lithium-ion Battery-Capacitor datasheet>>https://www.dragino.com/downloads/index.php?dir=datasheet/Battery/ER26500/]]

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[[image:image-20220615111024-1.png]]

=== 4.2 Replace Battery ===

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Any battery with range 2.45 ~~ 3.6v can be a replacement. We recommend to use Li-SOCl2 Battery.

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And make sure the positive and negative pins match.

=== 4.3 Power Consumption Analyze ===

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Dragino Battery powered product are all runs in Low Power mode. We have an update battery calculator which base on the measurement of the real device. User can use this calculator to check the battery life and calculate the battery life if want to use different transmit interval.

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Instruction to use as below:

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(% style="color:blue" %)**Step 1**(%%)**: **Downlink the up-to-date DRAGINO_Battery_Life_Prediction_Table.xlsx from:

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[[https:~~/~~/www.dragino.com/downloads/index.php?dir=LoRa_End_Node/Battery_Analyze/>>url:https://www.dragino.com/downloads/index.php?dir=LoRa_End_Node/Battery_Analyze/]]

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(% style="color:blue" %)**Step 2**(%%)**:** Open it and choose

* Product Model

* Uplink Interval

* Working Mode

And the Life expectation in difference case will be shown on the right.

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[[image:image-20220615165329-17.png||height="363" width="1123"]]

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(% id="cke_bm_628908S" style="display:none" %) (%%)The battery related documents as below:

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[[Battery Dimension>>https://www.dragino.com/downloads/index.php?dir=datasheet/Battery/]]

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[[Lithium-Thionyl Chloride Battery datasheet>>https://www.dragino.com/downloads/index.php?dir=datasheet/Battery/ER26500/]](% style="display:none" %)

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[[Lithium-ion Battery-Capacitor datasheet>>https://www.dragino.com/downloads/index.php?dir=datasheet/Battery/ER26500/]]

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[[image:image-20220615111024-1.png]]

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(% style="display:none" %) (%%)

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=== 4.3.1 Battery Note ===

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The Li-SICO battery is designed for small current / long period application. It is not good to use a high current, short period transmit method. The recommended minimum period for use of this battery is 5 minutes. If you use a shorter period time to transmit LoRa, then the battery life may be decreased.

=== 4.3.2 Replace the battery ===

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You can change the battery in the LMDS200.The type of battery is not limited as long as the output is between 3v to 3.6v.

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The default battery pack of LMDS200 includes a ER26500 plus super capacitor. If user can’t find this pack locally, they can find ER26500 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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=== 2.8.4 Battery Life Analyze ===

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Dragino battery powered products are all run in Low Power mode. User can check the guideline from this link to calculate the estimate battery life:

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[[https:~~/~~/www.dragino.com/downloads/downloads/LoRa_End_Node/Battery_Analyze/DRAGINO_Battery_Life_Guide.pdf>>url:https://www.dragino.com/downloads/downloads/LoRa_End_Node/Battery_Analyze/DRAGINO_Battery_Life_Guide.pdf]]

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= 4. FAQ =

== 4.1 What is the frequency plan for LDDS20? ==

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LDDS20 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="H2.7A0200BFirmwareChangeLog"]].

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

= 5. Trouble Shooting =

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

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

852

853

854

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

855

856

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" %)**LDDS20-XX**

867

868

869

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

870

871

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

872

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

873

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

874

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

875

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

876

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

877

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

878

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

= 7. Packing Info =

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**Package Includes**:

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* (((

LDDS20 LoRaWAN Liquid Level Sensor x 1

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(% style="color:red" %)**Note:**

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(% style="color:red" %)**Ultrasonic coupling paste**(%%) and(% style="color:red" %)** Eproxy AB glue**(%%) are subjected in most shipping way. So the default package doesn't include it and user needs to purchase locally.

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**Dimension and weight**:

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Device Size: cm

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Device Weight: g

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Package Size / pcs : cm

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Weight / pcs : g

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= 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 LMDS200 - LoRaWAN Microwave Radar Distance Sensor User Manual

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