Changes for page wiki_test

Last modified by Mengting Qiu on 2024/09/05 17:35

From 86.4 to 86.3 From 88.2 to 88.1

From version 88.1

edited by Mengting Qiu
on 2023/09/20 17:33

Change comment: Uploaded new attachment "image-20230920173352-2.png", version {1}

To version 86.4

edited by Xiaoling
on 2023/09/12 10:38

Change comment: There is no comment for this version

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@@ -1,1 +1,1 @@
--XWiki.ting
++XWiki.Xiaoling

Content

@@ -55,7 +55,6 @@
  * 8500mAh Battery for long term use
  * Nano SIM card slot for NB-IoT SIM
--
  == 1.3 Specification ==
@@ -101,65 +101,144 @@
  * STOP Mode: 10uA @ 3.3v
  * Max transmit power: 350mA@3.3v
++== 1.4 Suitable Container & Liquid ==
--== 1.4 Rated environmental conditions ==
++* Solid Wall container such as: steel, iron, glass, ceramics, non-foaming plastics etc.
++* Container shape is regular, and surface is smooth.
++* Container Thickness:
++** Pure metal material.  2~~8mm, best is 3~~5mm
++** Pure non metal material: <10 mm
++* Pure liquid without irregular deposition.
--(% border="1" cellspacing="5" style="background-color:#f2f2f2; width:500px" %)
--|(% style="background-color:#4f81bd; color:white; width:163px" %)**Item**|(% style="background-color:#4f81bd; color:white; width:90px" %)**Minimum value**|(% style="background-color:#4f81bd; color:white; width:70px" %)**Typical value**|(% style="background-color:#4f81bd; color:white; width:87px" %)**Maximum value**|(% style="background-color:#4f81bd; color:white; width:40px" %)**Unit**|(% style="background-color:#4f81bd; color:white; width:50px" %)**Remarks**
--|(% style="width:174px" %)Storage temperature|(% style="width:86px" %)-25|(% style="width:66px" %)25|(% style="width:90px" %)80|(% style="width:48px" %)℃|(% style="width:203px" %)
--|(% style="width:174px" %)Storage humidity|(% style="width:86px" %) |(% style="width:66px" %)65%|(% style="width:90px" %)90%|(% style="width:48px" %)RH|(% style="width:203px" %)(1)
--|(% style="width:174px" %)Operating temperature|(% style="width:86px" %)-15|(% style="width:66px" %)25|(% style="width:90px" %)60|(% style="width:48px" %)℃|(% style="width:203px" %)
--|(% style="width:174px" %)Working humidity|(% style="width:86px" %)(((
--
++(% style="display:none" %)
--
--)))|(% style="width:66px" %)65%|(% style="width:90px" %)80%|(% style="width:48px" %)RH|(% style="width:203px" %)(1)
++== 1.5 Install DDS20-NB ==
++
++(% style="color:blue" %)**Step 1**(%%):  ** Choose the installation point.**
++
++DDS20-NB (% style="color:red" %)**MUST**(%%) be installed on the container bottom middle position.
++
++[[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LDDS20%20-%20LoRaWAN%20Liquid%20Level%20Sensor%20User%20Manual/WebHome/image-20220615091045-3.png?rev=1.1||alt="image-20220615091045-3.png"]]
++
++
  (((
--(% style="color:red" %)**Remarks: (1)  a. When the ambient temperature is 0-39 ℃, the maximum humidity is 90% (non-condensing);       **
++(% style="color:blue" %)**Step 2**(%%):   **Polish the installation point.**
++)))
--(% style="color:red" %)**                       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)**
++(((
++For Metal Surface with paint, it is important to polish the surface, first use crude sand paper to polish the paint level , then use exquisite sand paper to polish the metal level to make it shine & smooth.
++)))
--
++[[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/DDS20-LB_LoRaWAN_Ultrasonic_Liquid_Level_Sensor_User_Manual/WebHome/image-20230613143052-5.png?rev=1.1||alt="image-20230613143052-5.png"]]
++
++
++No polish needed if the container is shine metal surface without paint or non-metal container.
++
++[[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/DDS20-LB_LoRaWAN_Ultrasonic_Liquid_Level_Sensor_User_Manual/WebHome/image-20230613143125-6.png?rev=1.1||alt="image-20230613143125-6.png"]]
++
++
++(((
++(% style="color:blue" %)**Step3:   **(%%)**Test the installation point.**
  )))
--== 1.5 Effective measurement range Reference beam pattern ==
++(((
++Power on DDS20-NB, check if the blue LED is on, If the blue LED is on, means the sensor works. Then put ultrasonic coupling paste on the sensor and put it tightly on the installation point.
++)))
++(((
++It is necessary to put the coupling paste between the sensor and the container, otherwise DDS20-NB won't detect the liquid level.
++)))
--(% style="color:blue" %)**1. The tested object is a white cylindrical tube made of PVC, with a height of 100cm and a diameter of 7.5cm.**
++(((
++After paste the DDS20-NB well, power on DDS20-NB. In the first 30 seconds of booting, device will check the sensors status and BLUE LED will show the status as below. After 30 seconds, BLUE LED will be off to save battery life.
++)))
--[[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LDDS75%20-%20LoRaWAN%20Distance%20Detection%20Sensor%20User%20Manual/WebHome/1654852253176-749.png?rev=1.1||alt="1654852253176-749.png"]]
++(((
++(% style="color:blue" %)**LED Status:**
++)))
--(% style="color:blue" %)**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.**
++* (((
++**Onboard LED**: When power on device, the onboard LED will fast blink 4 times which means detect the sensor well.
++)))
--[[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LDDS75%20-%20LoRaWAN%20Distance%20Detection%20Sensor%20User%20Manual/WebHome/1654852175653-550.png?rev=1.1||alt="1654852175653-550.png"]]
++* (((
++(% style="color:blue" %)**BLUE LED**(% style="color:red" %)** always ON**(%%): Sensor is power on but doesn't detect liquid. There is problem in installation point.
++)))
++* (((
++(% style="color:blue" %)**BLUE LED**(% style="color:red" %)** slowly blinking**(%%): Sensor detects Liquid Level, The installation point is good.
++)))
++(((
++DDS20-NB will enter into low power mode at 30 seconds after system reset or power on, Blue LED will be off after that.
++)))
++
++(((
++(% style="color:red" %)**Note :**(%%)** (% style="color:blue" %)Ultrasonic coupling paste(%%)**(% style="color:blue" %) (%%) is subjected in most shipping way. So the default package doesn't include it and user needs to purchase locally.
++)))
++
++
++(((
++(% style="color:blue" %)**Step4:   **(%%)**Install use Epoxy ab glue.**
++)))
++
++(((
++Prepare Eproxy AB glue.
++)))
++
++(((
++Put Eproxy AB glue in the sensor and press it hard on the container installation point.
++)))
++
++(((
++Reset DDS20-NB and see if the BLUE LED is slowly blinking.
++)))
++
++[[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/DDS20-LB_LoRaWAN_Ultrasonic_Liquid_Level_Sensor_User_Manual/WebHome/image-20230809172509-1.png?rev=1.1||alt="image-20230809172509-1.png"]]
++
++(((
++(% style="color:red" %)**Note :**(% style="color:red; display:none" %)** **
++
++(% style="color:red" %)**1:**(%%)** (% style="color:blue" %)Eproxy AB glue(%%)** needs 3~~ 5 minutes to stable attached. we can use other glue material to keep it in the position.
++)))
++
++(((
++(% style="color:red" %)**2:**(%%)** (% style="color:blue" %)Eproxy AB glue(%%)** is subjected in most shipping way. So the default package doesn't include it and user needs to purchase locally.
++)))
++
++
  == 1.6 Applications ==
--* 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
++* Smart liquid control solution
++* Smart liquefied gas solution
--== 1.7 Sleep mode and working mode ==
++== 1.7 Precautions ==
++* At room temperature, containers of different materials, such as steel, glass, iron, ceramics, non-foamed plastics and other dense materials, have different detection blind areas and detection limit heights.
++
++* For containers of the same material at room temperature, the detection blind zone and detection limit height are also different for the thickness of the container.
++
++* When the detected liquid level exceeds the effective detection value of the sensor, and the liquid level of the liquid to be measured shakes or tilts, the detected liquid height is unstable.
++
++(% style="display:none" %)
++
++
++
++== 1.8 Sleep mode and working mode ==
++
++
  (% style="color:blue" %)**Deep Sleep Mode: **(%%)Sensor doesn't have any LoRaWAN activate. This mode is used for storage and shipping to save battery life.
  (% style="color:blue" %)**Working Mode:** (%%)In this mode, Sensor will work as LoRaWAN Sensor to Join LoRaWAN network and send out sensor data to server. Between each sampling/tx/rx periodically, sensor will be in IDLE mode), in IDLE mode, sensor has the same power consumption as Deep Sleep mode.
--== 1.8 Button & LEDs ==
++== 1.9 Button & LEDs ==
  [[image:Main.User Manual for LoRaWAN End Nodes.D20-LBD22-LBD23-LB_LoRaWAN_Temperature_Sensor_User_Manual.WebHome@1675071855856-879.png]]
@@ -178,13 +178,12 @@
  )))
  |(% style="width:167px" %)Fast press ACT 5 times.|(% style="width:117px" %)Deactivate Device|(% style="width:225px" %)(% style="color:red" %)**Red led**(%%) will solid on for 5 seconds. Means device is in Deep Sleep Mode.
++== 1.10 BLE connection ==
--== 1.9 BLE connection ==
++DDS20-NB support BLE remote configure and firmware update.
--DDS45-NB support BLE remote configure and firmware update.
--
  BLE can be used to configure the parameter of sensor or see the console output from sensor. BLE will be only activate on below case:
  * Press button to send an uplink
@@ -194,19 +194,19 @@
  If there is no activity connection on BLE in 60 seconds, sensor will shut down BLE module to enter low power mode.
--== 1.10 Pin Definitions & Switch ==
++== 1.11 Pin Definitions & Switch ==
  [[image:image-20230819104805-5.png]]
--=== 1.10.1 Jumper JP2 ===
++=== 1.11.1 Jumper JP2 ===
  Power on Device when put this jumper.
--=== 1.10.2 BOOT MODE / SW1 ===
++=== 1.11.2 BOOT MODE / SW1 ===
  **1)** (% style="color:blue" %)**ISP**(%%): upgrade mode, device won't have any signal in this mode. but ready for upgrade firmware. LED won't work. Firmware won't run.
@@ -214,7 +214,7 @@
  **2)** (% style="color:blue" %)**Flash**(%%): work mode, device starts to work and send out console output for further debug
--=== 1.10.3 Reset Button ===
++=== 1.11.3 Reset Button ===
  Press to reboot the device.
@@ -222,8 +222,9 @@
  (% style="display:none" %)
--== 1.11 Mechanical ==
++== 1.12 Mechanical ==
++
  [[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/D20-LBD22-LBD23-LB_LoRaWAN_Temperature_Sensor_User_Manual/WebHome/1675143884058-338.png?rev=1.1||alt="1675143884058-338.png"]]
  [[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/D20-LBD22-LBD23-LB_LoRaWAN_Temperature_Sensor_User_Manual/WebHome/1675143899218-599.png?rev=1.1||alt="1675143899218-599.png"]]
@@ -233,16 +233,17 @@
  (% style="color:blue" %)**Probe Mechanical:**
--[[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LDDS45%20-%20LoRaWAN%20Distance%20Detection%20Sensor%20User%20Manual/WebHome/1654915562090-396.png?rev=1.1||alt="1654915562090-396.png"]]
++[[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LDDS20%20-%20LoRaWAN%20Liquid%20Level%20Sensor%20User%20Manual/WebHome/image-20220615090910-1.png?rev=1.1||alt="image-20220615090910-1.png"]]
++[[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LDDS20%20-%20LoRaWAN%20Liquid%20Level%20Sensor%20User%20Manual/WebHome/image-20220615090910-2.png?rev=1.1||alt="image-20220615090910-2.png"]]
--= 2. Use DDS45-NB to communicate with IoT Server =
++= 2. Use DDS20-NB to communicate with IoT Server =
  == 2.1 Send data to IoT server via NB-IoT network ==
--The DDS45-NB is equipped with a NB-IoT module, the pre-loaded firmware in DDS45-NB will get environment data from sensors and send the value to local NB-IoT network via the NB-IoT module.  The NB-IoT network will forward this value to IoT server via the protocol defined by DDS45-NB.
++The DDS20-NB is equipped with a NB-IoT module, the pre-loaded firmware in DDS20-NB will get environment data from sensors and send the value to local NB-IoT network via the NB-IoT module.  The NB-IoT network will forward this value to IoT server via the protocol defined by DDS20-NB.
  Below shows the network structure:
@@ -253,7 +253,7 @@
  There are two version: (% style="color:blue" %)**-GE**(%%) and (% style="color:blue" %)**-1D**(%%) version of DDS45-NB.
--(% style="color:blue" %)**GE Version**(%%): This version doesn't include SIM card or point to any IoT server. User needs to use AT Commands to configure below two steps to set DDS45-NB send data to IoT server.
++(% style="color:blue" %)**GE Version**(%%): This version doesn't include SIM card or point to any IoT server. User needs to use AT Commands to configure below two steps to set DDS20-NB send data to IoT server.
  * Install NB-IoT SIM card and configure APN. See instruction of [[Attach Network>>url:http://wiki.dragino.com/xwiki/bin/view/Main/General%20Configure%20to%20Connect%20to%20IoT%20server%20for%20-NB%20%26%20-NS%20NB-IoT%20models/#H2.AttachNetwork]].
@@ -283,13 +283,13 @@
  [[image:image-20230819113244-11.png||height="141" width="367"]]
  )))|(% style="width:170px" %)
--(% style="color:blue" %)**1D Version**(%%): This version has 1NCE SIM card pre-installed and configure to send value to DataCake. User Just need to select the sensor type in DataCake and Activate DDS45-NB and user will be able to see data in DataCake. See here for [[DataCake Config Instruction>>url:http://wiki.dragino.com/xwiki/bin/view/Main/General%20Configure%20to%20Connect%20to%20IoT%20server%20for%20-NB%20%26%20-NS%20NB-IoT%20models/#H3.4Datacake]].
++(% style="color:blue" %)**1D Version**(%%): This version has 1NCE SIM card pre-installed and configure to send value to DataCake. User Just need to select the sensor type in DataCake and Activate DDS20-NB and user will be able to see data in DataCake. See here for [[DataCake Config Instruction>>url:http://wiki.dragino.com/xwiki/bin/view/Main/General%20Configure%20to%20Connect%20to%20IoT%20server%20for%20-NB%20%26%20-NS%20NB-IoT%20models/#H3.4Datacake]].
  == 2.2 Payload Types ==
--To meet different server requirement, DDS45-NB supports different payload type.
++To meet different server requirement, DDS20-NB supports different payload type.
  **Includes:**
@@ -315,7 +315,7 @@
  This is the General Json Format. As below:
--(% style="color:#4472c4" %)**{"IMEI":866207053462762,"temperature":29.2,"humidity":54.2,"battery":3.27,"signal":24,"Model":DDS45-NB, "1":{28.2,48.3,2023/08/10 08:00:37},"2":{28.1,49.1,2023/08/10 07:57:37},"3":{28.1,48.5,2023/08/10 07:54:37},"4":{28.2,48.6,2023/08/10 07:51:37},"5":{28.1,48.9,2023/08/10 07:48:37},"6":{28.2,48.8,2023/08/10 07:45:37},"7":{28.2,48.8,2023/08/10 07:42:37},"8":{28.0,48.8,2023/08/10 07:39:37}}**
++(% style="color:#4472c4" %)**{"IMEI":866207053462762,"temperature":29.2,"humidity":54.2,"battery":3.27,"signal":24,"Model":DDS20-NB, "1":{28.2,48.3,2023/08/10 08:00:37},"2":{28.1,49.1,2023/08/10 07:57:37},"3":{28.1,48.5,2023/08/10 07:54:37},"4":{28.2,48.6,2023/08/10 07:51:37},"5":{28.1,48.9,2023/08/10 07:48:37},"6":{28.2,48.8,2023/08/10 07:45:37},"7":{28.2,48.8,2023/08/10 07:42:37},"8":{28.0,48.8,2023/08/10 07:39:37}}**
  (% style="color:red" %)**Notice, from above payload:**
@@ -324,7 +324,6 @@
  * Json entry 1 ~~ 8 are the last 1 ~~ 8 sampling data as specify by (% style="color:#037691" %)**AT+NOUD=8 ** (%%)Command. Each entry includes (from left to right): Temperature, Humidity, Sampling time.
--
  === 2.2.2 HEX format Payload(Type~=0) ===
@@ -332,7 +332,7 @@
  (% style="color:#4472c4" %)**f86620705346276200640cba16010000000011011801e864d49c2d011a01e364d49925011901eb64d49871011901e564d497bd011a01e664d49709011901e964d49655011a01e864d495a1011a01e864d494ed011801e864d49439**
--[[image:image-20230920172200-1.png||height="198" width="1085"]]
++[[image:1692424009971-458.png]]
  (% style="color:blue" %)**Version:**
@@ -339,7 +339,7 @@
  These bytes include the hardware and software version.
--(% style="color:#037691" %)**Higher byte:**(%%) Specify Sensor Model: 0x00 for DDS45-NB
++(% style="color:#037691" %)**Higher byte:**(%%) Specify Sensor Model: 0x00 for DDS20-NB
  (% style="color:#037691" %)**Lower byte:**(%%) Specify the software version: 0x64=100, means firmware version 100
@@ -397,7 +397,7 @@
  (((
--DDS45-NB will uplink payload via LoRaWAN with below payload format:
++DDS20-NB will uplink payload via LoRaWAN with below payload format:
  )))
  (((
@@ -419,7 +419,7 @@
  === 2.3.1  Battery Info ===
--Check the battery voltage for DDS45-NB.
++Check the battery voltage for DDS20-NB.
  Ex1: 0x0B45 = 2885mV
@@ -430,20 +430,19 @@
  (((
--Get the distance. Flat object range 30mm - 4500mm.
++Get the distance. Flat object range 20mm - 2000mm.
  )))
  (((
--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" %)** **
++For example, if the data you get from the register is **0x06 0x05**, the distance between the sensor and the measured object is(% style="color:#4472c4" %)** **
--(% style="color:blue" %)**0B05(H) = 2821 (D) = 2821 mm.**
++(% style="color:blue" %)**0605(H) = 1541 (D) = 1541 mm.**
  )))
  * If the sensor value is 0x0000, it means system doesn't detect ultrasonic sensor.
--* If the sensor value lower than 0x001E (30mm), the sensor value will be 0x00.
++* If the sensor value lower than 0x0014 (20mm), the sensor value will be invalid.
--
  === 2.3.3  Interrupt Pin ===
@@ -496,7 +496,7 @@
  == 2.5 Multi-Samplings and One uplink ==
--To save battery life, DDS45-NB will sample temperature & humidity data every 15 minutes and send one uplink every 2 hours. So each uplink it will include 8 stored data + 1 real-time data. They are defined by:
++To save battery life, DDS20-NB will sample temperature & humidity data every 15 minutes and send one uplink every 2 hours. So each uplink it will include 8 stored data + 1 real-time data. They are defined by:
  * (% style="color:#037691" %)**AT+TR=900**   (%%)     ~/~/ The unit is seconds, and the default is to record data once every 900 seconds (15 minutes, the minimum can be set to 180 seconds)
@@ -510,7 +510,7 @@
  == 2.6 Trggier an uplink by external interrupt ==
--DDS45-NB has an external trigger interrupt function. Users can use the PB15 pin to trigger the upload of data packets.
++DDS20-NB has an external trigger interrupt function. Users can use the PB15 pin to trigger the upload of data packets.
  (% style="color:blue" %)**AT command:**
@@ -524,19 +524,17 @@
  * (% style="color:#037691" %)**AT+INTMOD=3  **(%%)  ~/~/ Trigger by rising edge
++= 3. Configure DDS20-NB =
--= 3. Configure DDS45-NB =
--
  == 3.1 Configure Methods ==
--DDS45-NB supports below configure method:
++DDS20-NB supports below configure method:
  * AT Command via Bluetooth Connection (**Recommended**): [[BLE Configure Instruction>>http://wiki.dragino.com/xwiki/bin/view/Main/BLE%20Bluetooth%20Remote%20Configure/]].
  * AT Command via UART Connection : See [[UART Connection>>http://wiki.dragino.com/xwiki/bin/view/Main/UART%20Access%20for%20LoRa%20ST%20v4%20base%20model/#H2.3UARTConnectionforSN50v3basemotherboard]].
--
  == 3.2 AT Commands Set ==
@@ -620,7 +620,7 @@
  = 4. Battery & Power Consumption =
--DDS45-NB use ER26500 + SPC1520 battery pack. See below link for detail information about the battery info and how to replace.
++DDS20-NB use ER26500 + SPC1520 battery pack. See below link for detail information about the battery info and how to replace.
  [[**Battery Info & Power Consumption Analyze**>>http://wiki.dragino.com/xwiki/bin/view/Main/How%20to%20calculate%20the%20battery%20life%20of%20Dragino%20sensors%3F/]] .
@@ -634,7 +634,7 @@
  * Fix bugs.
--Firmware and changelog can be downloaded from : **[[Firmware download link>>https://www.dropbox.com/sh/l0bszumyrmil3yv/AAAg8LYGeAgDsD_ycCnweD72a?dl=0]]**
++Firmware and changelog can be downloaded from : **[[Firmware download link>>https://www.dropbox.com/sh/nyzeu0lf0amcaek/AAC6UZrqyTcAyJgXOH7l9F9Ka?dl=0]]**
  Methods to Update Firmware:
@@ -642,7 +642,6 @@
  * Update through UART TTL interface : **[[Instruction>>url:http://wiki.dragino.com/xwiki/bin/view/Main/UART%20Access%20for%20LoRa%20ST%20v4%20base%20model/#H1.LoRaSTv4baseHardware]]**.
--
  = 6. FAQ =
  == 6.1 How can I access t BC660K-GL AT Commands? ==
@@ -653,49 +653,23 @@
  [[See BC660K-GL AT Command set>>url:https://www.dropbox.com/sh/5f6ssda5fum8rvs/AABT68l8ZzWOvZ5eg2qwOoFda?dl=0]]
--== 6.2 Can I use DDS45-NB in condensation environment? ==
++= 7.  Trouble Shooting =
++== 7.1  Why i always see 0x0000 or 0 for the distance value? ==
--DDS45-NB is not suitable to be used in condensation environment. Condensation on the DDS45-NB probe will affect the reading and always got 0.
++(((
++DDS20-NB has a strict [[**installation requirement**>>||anchor="H1.5A0InstallDDS20-NB"]]. Please make sure the installation method exactly follows up with the installation requirement. Otherwise, the reading might be always 0x00.
--= 7. Trouble Shooting =
++If you have followed the instruction requirement exactly but still see the 0x00 reading issue, please. please double-check the decoder, you can check the raw payload to verify.
--== 7.1 Why does the sensor reading show 0 or "No sensor" ==
++
++)))
--
--~1. The measurement object is very close to the sensor, but in the blind spot of the sensor.
--
--2. Sensor wiring is disconnected
--
--3. Not using the correct decoder
--
--
--== 7.2 Abnormal readings The gap between multiple readings is too large or the gap between the readings and the actual value is too large ==
--
--
--1) Please check if there is something on the probe affecting its measurement (condensed water, volatile oil, etc.)
--
--2) Does it change with temperature, temperature will affect its measurement
--
--3) If abnormal data occurs, you can turn on DEBUG mode, Please use downlink or AT COMMAN to enter DEBUG mode.
--
--downlink command: (% style="color:blue" %)**F1 01**(%%), AT command: (% style="color:blue" %)**AT+DDEBUG=1**
--
--4) After entering the debug mode, it will send 20 pieces of data at a time, and you can send its uplink to us for analysis
--
--[[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LDDS75%20-%20LoRaWAN%20Distance%20Detection%20Sensor%20User%20Manual/WebHome/image-20230113135125-2.png?width=1057&height=136&rev=1.1||alt="image-20230113135125-2.png"]]
--
--
--Its original payload will be longer than other data. Even though it is being parsed, it can be seen that it is abnormal data.
--
--Please send the data to us for check.
--
--
  = 8. Order Info =
--Part Number: (% style="color:blue" %)**DDS45-NB-XX**
++Part Number: (% style="color:blue" %)**DDS20-NB-XX**
  (% style="color:red" %)**XX**(%%):
@@ -711,7 +711,7 @@
  (% style="color:#037691" %)**Package Includes**:
--* DDS45-NB NB-IoT Distance Detection sensor x 1
++* DDS20-NB NB-IoT Ultrasonic liquid level sensor x 1
  * External antenna x 1
@@ -725,7 +725,6 @@
  * Weight / pcs : 180g
--
  = 10. Support =

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