Changes for page LMDS200 -- LoRaWAN Microwave Radar Distance Sensor User Manual

Last modified by Xiaoling on 2025/04/27 16:45

From version < 151.12 >

edited by Xiaoling
on 2022/06/11 09:38

To version < 150.18 >

edited by Xiaoling
on 2022/06/11 08:50

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  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]]
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  * 4000mAh or 8500mAh Battery for long term use
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  == 1.3  Specification ==
  === 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);       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)**
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++**Remarks: (1)  a. When the ambient temperature is 0-39 ℃, the maximum humidity is 90% (non-condensing);**
++**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 ===
  **(1) The tested object is a white cylindrical tube made of PVC, with a height of 100cm and a diameter of 7.5cm.**
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  **(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" %) ** **
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  == 1.6  Pin mapping and power on ==
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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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  == 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.
  Payload for firmware version v1.1.4. . Before v1.1.3, there is on two fields: BAT and Distance
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  === 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.
  * 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 ===
  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.
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  === 2.3.5  Sensor Flag ===
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 x01: Detect Ultrasonic Sensor
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 x00: No Ultrasonic Sensor
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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/]]
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  * Solid ON for 5 seconds once device successful Join the network.
  * 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]]
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  [[image:image-20220610172003-1.png]]
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  [[image:image-20220610172003-2.png]]
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  == 2.10  Battery Analysis ==
  === 2.10.1  Battery Type ===
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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]],
++[[ 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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  === 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.
++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)
++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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--AT Command Connection: See [[FAQ>>||anchor="H4.A0FAQ"]].
++AT Command Connection: See [[FAQ>>||anchor="H7.A0FAQ"]].
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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"]]
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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
  * Example 2: Downlink Payload: 0100003C ~/~/ Set Transmit Interval (TDC) = 60 seconds
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  == 3.3  Set Interrupt Mode ==
  Feature, Set Interrupt mode for GPIO_EXIT.
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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
  * Example 2: Downlink Payload: 06000003 ~/~/ Set the interrupt mode to rising edge trigger
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  = 4.  FAQ =
  == 4.1  What is the frequency plan for LDDS75? ==

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