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Last modified by Xiaoling on 2025/04/27 16:45
From version 168.1
edited by Xiaoling
on 2022/06/15 09:22
Change comment: Uploaded new attachment "1655256160324-178.png", version {1}
To version 148.1
edited by Xiaoling
on 2022/06/10 17:48
Change comment: Uploaded new attachment "image-20220610174836-8.png", version {1}

Summary

Details

Page properties
Title
... ... @@ -1,1 +1,1 @@
1 -LDDS20 - LoRaWAN Ultrasonic Liquid Level Sensor User Manual
1 +LDDS75 - LoRaWAN Distance Detection Sensor User Manual
Content
... ... @@ -1,97 +1,54 @@
1 1  (% style="text-align:center" %)
2 -[[image:1655254599445-662.png]]
2 +[[image:1654846127817-788.png]]
3 3  
4 +**Contents:**
4 4  
5 5  
6 6  
7 -**Table of Contents:**
8 8  
9 9  
10 10  
11 11  
12 12  
13 -
14 -
15 -
16 16  = 1.  Introduction =
17 17  
18 -== 1.1 ​ What is LoRaWAN Ultrasonic liquid level Sensor ==
15 +== 1.1 ​ What is LoRaWAN Distance Detection Sensor ==
19 19  
20 20  (((
21 21  
22 22  
23 23  (((
24 -(((
25 -(((
26 -The Dragino LDDS20 is a (% style="color:#4472c4" %)**LoRaWAN Ultrasonic liquid level sensor**(%%) for Internet of Things solution. It uses (% style="color:#4472c4" %)**none-contact method **(%%)to measure the height of liquid in a container without opening the container, and send the value via LoRaWAN network to IoT Server
27 -)))
21 +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.
28 28  
29 -(((
30 -
31 -)))
32 32  
33 -(((
34 -The LDDS20 sensor is installed directly below the container to detect the height of the liquid level. User doesn’t need to open a hole on the container to be tested. The (% style="color:#4472c4" %)**none-contact measurement makes the measurement safety, easier and possible for some strict situation**. 
35 -)))
24 +It detects the distance** (% style="color:#4472c4" %) between the measured object and the sensor(%%)**, and uploads the value via wireless to LoRaWAN IoT Server.
36 36  
37 -(((
38 -
39 -)))
40 40  
41 -(((
42 -LDDS20 uses ultrasonic sensing technology for distance measurement. LDDS20 is of high accuracy to measure various liquid such as: (% style="color:#4472c4" %)**toxic substances**(%%), (% style="color:#4472c4" %)**strong acids**(%%), (% style="color:#4472c4" %)**strong alkalis**(%%) and (% style="color:#4472c4" %)**various pure liquids**(%%) in high-temperature and high-pressure airtight containers.
43 -)))
27 +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.
44 44  
45 -(((
46 -
47 -)))
48 48  
49 -(((
50 -The LoRa wireless technology used in LDDS20 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.
51 -)))
30 +LDDS75 is powered by (% style="color:#4472c4" %)** 4000mA or 8500mAh Li-SOCI2 battery**(%%); It is designed for long term use up to 10 years*.
52 52  
53 -(((
54 -
55 -)))
56 56  
57 -(((
58 -LDDS20 is powered by (% style="color:#4472c4" %)**8500mA Li-SOCI2 battery**(%%); It is designed for long term use up to 10 years*.
59 -)))
33 +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.
60 60  
61 -(((
62 -
63 -)))
64 64  
65 -(((
66 -Each LDDS20 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.
36 +(% style="color:#4472c4" %) * (%%)Actually lifetime depends on network coverage and uplink interval and other factors
67 67  )))
68 -
69 -(((
70 -
71 71  )))
72 -)))
73 73  
74 -(((
75 -(((
76 -(% style="color:#4472c4" %) * (%%)Actually lifetime depends on network coverage and uplink interval and other factors.
77 -)))
78 -)))
79 -)))
80 -)))
81 81  
41 +[[image:1654847051249-359.png]]
82 82  
83 -[[image:1655255122126-327.png]]
84 84  
85 85  
86 -
87 87  == ​1.2  Features ==
88 88  
89 89  * LoRaWAN 1.0.3 Class A
90 90  * Ultra low power consumption
91 -* Liquid Level Measurement by Ultrasonic technology
92 -* Measure through container, No need to contact Liquid.
93 -* Valid level range 20mm - 2000mm
94 -* Accuracy: ±(5mm+S*0.5%) (S: Measure Value)
49 +* Distance Detection by Ultrasonic technology
50 +* Flat object range 280mm - 7500mm
51 +* Accuracy: ±(1cm+S*0.3%) (S: Distance)
95 95  * Cable Length : 25cm
96 96  * Bands: CN470/EU433/KR920/US915/EU868/AS923/AU915/IN865
97 97  * AT Commands to change parameters
... ... @@ -98,113 +98,36 @@
98 98  * Uplink on periodically
99 99  * Downlink to change configure
100 100  * IP66 Waterproof Enclosure
101 -* 8500mAh Battery for long term use
58 +* 4000mAh or 8500mAh Battery for long term use
102 102  
60 +== 1.3  Specification ==
103 103  
104 -== 1.3  Suitable Container & Liquid ==
62 +=== 1.3.1  Rated environmental conditions ===
105 105  
106 -* Solid Wall container such as: steel, iron, glass, ceramics, non-foaming plastics etc.
107 -* Container shape is regular, and surface is smooth.
108 -* Container Thickness:
109 -** Pure metal material.  2~~8mm, best is 3~~5mm
110 -** Pure non metal material: <10 mm
111 -* Pure liquid without irregular deposition.
64 +[[image:image-20220610154839-1.png]]
112 112  
66 +**Remarks: (1) a. When the ambient temperature is 0-39 ℃, the maximum humidity is 90% (non-condensing);**
113 113  
114 -== 1.4  Mechanical ==
68 +**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)**
115 115  
116 -[[image:image-20220615090910-1.png]]
117 117  
118 118  
119 -[[image:image-20220615090910-2.png]]
72 +=== 1.3.2  Effective measurement range Reference beam pattern ===
120 120  
74 +**(1) The tested object is a white cylindrical tube made of PVC, with a height of 100cm and a diameter of 7.5cm.**
121 121  
122 122  
123 -== 1.5  Install LDDS20 ==
124 124  
78 +[[image:1654852253176-749.png]]
125 125  
126 -(% style="color:blue" %)**Step 1**(%%):  Choose the installation point.
127 127  
128 -LDDS20 (% style="color:red" %)**MUST**(%%) be installed on the container bottom middle position.
81 +**(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.**
129 129  
130 -[[image:image-20220615091045-3.png]]
131 131  
84 +[[image:1654852175653-550.png]](% style="display:none" %) ** **
132 132  
133 133  
134 -(% style="color:blue" %)**Step 2**(%%): Polish the installation point.
135 135  
136 -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.
137 -
138 -[[image:image-20220615092010-11.png]]
139 -
140 -
141 -No polish needed if the container is shine metal surface without paint or non-metal container.
142 -
143 -[[image:image-20220615092044-12.png]]
144 -
145 -
146 -(% style="color:blue" %)**Step3: **(%%)Test the installation point.
147 -
148 -Power on LDDS75, 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.
149 -
150 -
151 -It is necessary to put the coupling paste between the sensor and the container, otherwise LDDS20 won’t detect the liquid level.
152 -
153 -
154 -
155 -|(((
156 -BLUE LED
157 -)))
158 -
159 -[[image:image-20220615091045-6.png]] [[image:image-20220615091045-7.png]]
160 -
161 -
162 -
163 -After paste the LDDS20 well, power on LDDS20. 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.
164 -
165 -
166 -(% style="color:blue" %)LED Status:
167 -
168 -* Onboard LED: When power on device, the onboard LED will fast blink 4 times which means detect the sensor well.
169 -
170 -* (% 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.
171 -* (% style="color:blue" %)BLUE LED(% style="color:red" %) slowly blinking(%%): Sensor detects Liquid Level, The installation point is good.
172 -
173 -LDDS20 will enter into low power mode at 30 seconds after system reset or power on, Blue LED will be off after that.
174 -
175 -Note 2:
176 -
177 -Ultrasonic coupling paste is subjected in most shipping way. So the default package doesn’t include it and user needs to purchase locally.
178 -
179 -
180 -(% style="color:blue" %)**Step4: **(%%)Install use Epoxy ab glue.
181 -
182 -[[image:image-20220615091045-8.png]]
183 -
184 -Prepare Eproxy AB glue.
185 -
186 -
187 -Put Eproxy AB glue in the sensor and press it hard on the container installation point.
188 -
189 -
190 -Reset LDDS20 and see if the BLUE LED is slowly blinking.
191 -
192 -[[image:image-20220615091045-9.png]]
193 -
194 -(% style="color:red" %)Note1:
195 -
196 -Eproxy AB glue needs 3~~ 5 minutes to stable attached. we can use other glue material to keep it in the position.
197 -
198 -
199 -(% style="color:red" %)Note 2:
200 -
201 -(% 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.
202 -
203 -
204 -
205 -
206 -
207 -
208 208  == 1.5 ​ Applications ==
209 209  
210 210  * Horizontal distance measurement
... ... @@ -253,8 +253,6 @@
253 253  )))
254 254  
255 255  (((
256 -
257 -
258 258  (% style="color:blue" %)**Step 1**(%%): Create a device in TTN with the OTAA keys from LDDS75.
259 259  )))
260 260  
... ... @@ -265,19 +265,11 @@
265 265  [[image:image-20220607170145-1.jpeg]]
266 266  
267 267  
268 -(((
269 269  For OTAA registration, we need to set **APP EUI/ APP KEY/ DEV EUI**. Some server might no need to set APP EUI.
270 -)))
271 271  
272 -(((
273 273  Enter these keys in the LoRaWAN Server portal. Below is TTN V3 screen shot:
274 -)))
275 275  
276 -(((
277 -
278 -
279 279  **Add APP EUI in the application**
280 -)))
281 281  
282 282  [[image:image-20220610161353-4.png]]
283 283  
... ... @@ -320,15 +320,11 @@
320 320  == 2.3  ​Uplink Payload ==
321 321  
322 322  (((
323 -(((
324 324  LDDS75 will uplink payload via LoRaWAN with below payload format: 
325 -)))
326 326  
327 -(((
328 328  Uplink payload includes in total 4 bytes.
329 329  Payload for firmware version v1.1.4. . Before v1.1.3, there is on two fields: BAT and Distance
330 330  )))
331 -)))
332 332  
333 333  (((
334 334  
... ... @@ -339,12 +339,12 @@
339 339  **Size (bytes)**
340 340  )))|=(% style="width: 62.5px;" %)**2**|=**2**|=1|=2|=**1**
341 341  |(% style="width:62.5px" %)**Value**|(% style="width:62.5px" %)[[BAT>>||anchor="H2.3.1A0BatteryInfo"]]|(((
342 -[[Distance>>||anchor="H2.3.2A0Distance"]]
208 +[[Distance>>||anchor="H2.3.3A0Distance"]]
343 343  
344 344  (unit: mm)
345 -)))|[[Digital Interrupt (Optional)>>||anchor="H2.3.3A0InterruptPin"]]|(((
346 -[[Temperature (Optional )>>||anchor="H2.3.4A0DS18B20Temperaturesensor"]]
347 -)))|[[Sensor Flag>>||anchor="H2.3.5A0SensorFlag"]]
211 +)))|[[Digital Interrupt (Optional)>>||anchor="H2.3.4A0Distancesignalstrength"]]|(((
212 +[[Temperature (Optional )>>||anchor="H2.3.5A0InterruptPin"]]
213 +)))|[[Sensor Flag>>path:#Sensor_Flag]]
348 348  
349 349  [[image:1654850511545-399.png]]
350 350  
... ... @@ -363,13 +363,9 @@
363 363  
364 364  === 2.3.2  Distance ===
365 365  
366 -(((
367 367  Get the distance. Flat object range 280mm - 7500mm.
368 -)))
369 369  
370 -(((
371 371  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.**
372 -)))
373 373  
374 374  
375 375  * If the sensor value is 0x0000, it means system doesn’t detect ultrasonic sensor.
... ... @@ -377,7 +377,7 @@
377 377  
378 378  === 2.3.3  Interrupt Pin ===
379 379  
380 -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.
242 +This data field shows if this packet is generated by interrupt or not. [[Click here>>||anchor="H4.2A0SetInterruptMode"]] for the hardware and software set up.
381 381  
382 382  **Example:**
383 383  
... ... @@ -403,18 +403,14 @@
403 403  
404 404  === 2.3.5  Sensor Flag ===
405 405  
406 -(((
407 407  0x01: Detect Ultrasonic Sensor
408 -)))
409 409  
410 -(((
411 411  0x00: No Ultrasonic Sensor
412 -)))
413 413  
414 414  
273 +===
274 +(% style="color:inherit; font-family:inherit" %)2.3.6  Decode payload in The Things Network(%%) ===
415 415  
416 -=== 2.3.6  Decode payload in The Things Network ===
417 -
418 418  While using TTN network, you can add the payload format to decode the payload.
419 419  
420 420  
... ... @@ -422,9 +422,7 @@
422 422  
423 423  The payload decoder function for TTN V3 is here:
424 424  
425 -(((
426 426  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/]]
427 -)))
428 428  
429 429  
430 430  
... ... @@ -953,17 +953,10 @@
953 953  == 2.8  ​Firmware Change Log ==
954 954  
955 955  
956 -(((
957 957  **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/]]
958 -)))
959 959  
960 -(((
961 -
962 -)))
963 963  
964 -(((
965 965  **Firmware Upgrade Method: **[[Firmware Upgrade Instruction>>doc:Main.Firmware Upgrade Instruction for STM32 base products.WebHome]]
966 -)))
967 967  
968 968  
969 969  
... ... @@ -972,11 +972,9 @@
972 972  
973 973  [[image:image-20220610172003-1.png]]
974 974  
975 -
976 976  [[image:image-20220610172003-2.png]]
977 977  
978 978  
979 -
980 980  == 2.10  Battery Analysis ==
981 981  
982 982  === 2.10.1  Battery Type ===
... ... @@ -987,7 +987,7 @@
987 987  The battery related documents as below:
988 988  
989 989  * (((
990 -[[Battery Dimension>>url:http://www.dragino.com/downloads/index.php?dir=datasheet/Battery/&file=LSN50-Battery-Dimension.pdf]],
837 +[[ Battery Dimension>>url:http://www.dragino.com/downloads/index.php?dir=datasheet/Battery/&file=LSN50-Battery-Dimension.pdf]],
991 991  )))
992 992  * (((
993 993  [[Lithium-Thionyl Chloride Battery  datasheet>>url:https://www.dragino.com/downloads/downloads/datasheet/Battery/ER26500/ER26500_Datasheet-EN.pdf]],
... ... @@ -1003,7 +1003,7 @@
1003 1003  === 2.10.2  Replace the battery ===
1004 1004  
1005 1005  (((
1006 -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.
853 +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.
1007 1007  )))
1008 1008  
1009 1009  (((
... ... @@ -1011,12 +1011,12 @@
1011 1011  )))
1012 1012  
1013 1013  (((
1014 -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)
861 +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)
1015 1015  )))
1016 1016  
1017 1017  
1018 1018  
1019 -= 3.  Configure LDDS75 via AT Command or LoRaWAN Downlink =
866 += 3.  Configure LLDS12 via AT Command or LoRaWAN Downlink =
1020 1020  
1021 1021  (((
1022 1022  (((
... ... @@ -1026,7 +1026,7 @@
1026 1026  
1027 1027  * (((
1028 1028  (((
1029 -AT Command Connection: See [[FAQ>>||anchor="H4.A0FAQ"]].
876 +AT Command Connection: See [[FAQ>>||anchor="H7.A0FAQ"]].
1030 1030  )))
1031 1031  )))
1032 1032  * (((
... ... @@ -1107,9 +1107,7 @@
1107 1107  [[image:image-20220610172924-5.png]]
1108 1108  
1109 1109  
1110 -(((
1111 1111  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:
1112 -)))
1113 1113  
1114 1114  
1115 1115   [[image:image-20220610172924-6.png||height="601" width="860"]]
... ... @@ -1133,19 +1133,16 @@
1133 1133  (((
1134 1134  Format: Command Code (0x01) followed by 3 bytes time value.
1135 1135  
1136 -(((
1137 1137  If the downlink payload=0100003C, it means set the END Node’s Transmit Interval to 0x00003C=60(S), while type code is 01.
1138 -)))
1139 1139  
1140 1140  * Example 1: Downlink Payload: 0100001E ~/~/ Set Transmit Interval (TDC) = 30 seconds
1141 1141  * Example 2: Downlink Payload: 0100003C ~/~/ Set Transmit Interval (TDC) = 60 seconds
1142 1142  )))
1143 -)))
1144 1144  
1145 1145  
988 +
989 +)))
1146 1146  
1147 -
1148 -
1149 1149  == 3.3  Set Interrupt Mode ==
1150 1150  
1151 1151  Feature, Set Interrupt mode for GPIO_EXIT.
... ... @@ -1152,7 +1152,7 @@
1152 1152  
1153 1153  (% style="color:#037691" %)**Downlink Command: AT+INTMOD**
1154 1154  
1155 -[[image:image-20220610174917-9.png]]
997 +[[image:image-20220610105907-1.png]]
1156 1156  
1157 1157  
1158 1158  (% style="color:#037691" %)**Downlink Command: 0x06**
... ... @@ -1159,72 +1159,113 @@
1159 1159  
1160 1160  Format: Command Code (0x06) followed by 3 bytes.
1161 1161  
1162 -(((
1163 1163  This means that the interrupt mode of the end node is set to 0x000003=3 (rising edge trigger), and the type code is 06.
1164 -)))
1165 1165  
1166 1166  * Example 1: Downlink Payload: 06000000 ~/~/ Turn off interrupt mode
1167 1167  * Example 2: Downlink Payload: 06000003 ~/~/ Set the interrupt mode to rising edge trigger
1168 1168  
1169 -= 4.  FAQ =
1170 1170  
1171 -== 4.1  What is the frequency plan for LDDS75? ==
1172 1172  
1173 -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"]]
1174 1174  
1012 += 6.  Use AT Command =
1175 1175  
1014 +== 6.1  Access AT Commands ==
1176 1176  
1177 -== 4.2  How to change the LoRa Frequency Bands/Region ==
1016 +LLDS12 supports AT Command set in the stock firmware. You can use a USB to TTL adapter to connect to LLDS12 for using AT command, as below.
1178 1178  
1179 -You can follow the instructions for [[how to upgrade image>>||anchor="H2.8A0200BFirmwareChangeLog"]].
1180 -When downloading the images, choose the required image file for download. ​
1018 +[[image:1654593668970-604.png]]
1181 1181  
1020 +**Connection:**
1182 1182  
1022 +(% style="background-color:yellow" %)** USB TTL GND <~-~-~-~-> GND**
1183 1183  
1184 -== 4.3  Can I use LDDS75 in condensation environment? ==
1024 +(% style="background-color:yellow" %)** USB TTL TXD  <~-~-~-~-> UART_RXD**
1185 1185  
1186 -LDDS75 is not suitable to be used in condensation environment. Condensation on the LDDS75 probe will affect the reading and always got 0.
1026 +(% style="background-color:yellow" %)** USB TTL RXD  <~-~-~-~-> UART_TXD**
1187 1187  
1188 1188  
1029 +(((
1030 +(((
1031 +In the PC, you need to set the serial baud rate to (% style="color:green" %)**9600**(%%) to access the serial console for LLDS12.
1032 +)))
1189 1189  
1190 -= 5.  Trouble Shooting =
1034 +(((
1035 +LLDS12 will output system info once power on as below:
1036 +)))
1037 +)))
1191 1191  
1192 -== 5.1  Why I can’t join TTN V3 in US915 / AU915 bands? ==
1193 1193  
1194 -It is due to channel mapping. Please see below link:  [[Frequency band>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H2.NoticeofUS9152FCN4702FAU915Frequencyband"]]
1040 + [[image:1654593712276-618.png]]
1195 1195  
1042 +Valid AT Command please check [[Configure Device>>||anchor="H4.A0ConfigureLLDS12viaATCommandorLoRaWANDownlink"]].
1196 1196  
1197 -== 5.2  AT Command input doesn't work ==
1198 1198  
1045 += 4.  FAQ =
1046 +
1047 +== 4.1  How to change the LoRa Frequency Bands/Region ==
1048 +
1049 +You can follow the instructions for [[how to upgrade image>>||anchor="H2.8A0200BFirmwareChangeLog"]].
1050 +When downloading the images, choose the required image file for download. ​
1051 +
1052 +
1053 += 5.  Trouble Shooting =
1054 +
1055 +== 5.1  AT Commands input doesn’t work ==
1056 +
1057 +
1058 +(((
1199 1199  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.
1060 +)))
1200 1200  
1062 +
1063 +== 5.2  Significant error between the output distant value of LiDAR and actual distance ==
1064 +
1065 +
1201 1201  (((
1067 +(% style="color:blue" %)**Cause ①**(%%)**：**Due to the physical principles of The LiDAR probe, the above phenomenon is likely to occur if the detection object is the material with high reflectivity (such as mirror, smooth floor tile, etc.) or transparent substance (such as glass and water, etc.)
1068 +)))
1069 +
1070 +(((
1071 +Troubleshooting: Please avoid use of this product under such circumstance in practice.
1072 +)))
1073 +
1074 +(((
1202 1202  
1203 1203  )))
1204 1204  
1078 +(((
1079 +(% style="color:blue" %)**Cause ②**(%%)**: **The IR-pass filters are blocked.
1080 +)))
1205 1205  
1082 +(((
1083 +Troubleshooting: please use dry dust-free cloth to gently remove the foreign matter.
1084 +)))
1085 +
1086 +
1087 +
1206 1206  = 6.  Order Info =
1207 1207  
1208 1208  
1209 -Part Number **:** (% style="color:blue" %)**LDDS75-XX-YY**
1091 +Part Number: (% style="color:blue" %)**LDDS75-XX-YY**
1210 1210  
1211 1211  
1212 -(% style="color:blue" %)**XX**(%%)**: **The default frequency band
1094 +(% style="color:blue" %)**XX**(%%): The default frequency band
1213 1213  
1214 -* (% style="color:red" %)**AS923 **(%%)**:** LoRaWAN AS923 band
1215 -* (% style="color:red" %)**AU915 **(%%)**:** LoRaWAN AU915 band
1216 -* (% style="color:red" %)**EU433 **(%%)**:** LoRaWAN EU433 band
1217 -* (% style="color:red" %)**EU868 **(%%)**:** LoRaWAN EU868 band
1218 -* (% style="color:red" %)**KR920 **(%%)**:** LoRaWAN KR920 band
1219 -* (% style="color:red" %)**US915 **(%%)**:** LoRaWAN US915 band
1220 -* (% style="color:red" %)**IN865 **(%%)**:**  LoRaWAN IN865 band
1221 -* (% style="color:red" %)**CN470 **(%%)**:** LoRaWAN CN470 band
1096 +* (% style="color:red" %)**AS923**(%%):  LoRaWAN AS923 band
1097 +* (% style="color:red" %)**AU915**(%%): LoRaWAN AU915 band
1098 +* (% style="color:red" %)**EU433**(%%): LoRaWAN EU433 band
1099 +* (% style="color:red" %)**EU868**(%%): LoRaWAN EU868 band
1100 +* (% style="color:red" %)**KR920**(%%): LoRaWAN KR920 band
1101 +* (% style="color:red" %)**US915**(%%): LoRaWAN US915 band
1102 +* (% style="color:red" %)**IN865**(%%):  LoRaWAN IN865 band
1103 +* (% style="color:red" %)**CN470**(%%): LoRaWAN CN470 band
1222 1222  
1223 1223  (% style="color:blue" %)**YY**(%%): Battery Option
1224 1224  
1225 -* (% style="color:red" %)**4 **(%%)**: **4000mAh battery
1226 -* (% style="color:red" %)**8 **(%%)**:** 8500mAh battery
1107 +* (% style="color:red" %)**4**(%%): 4000mAh battery
1108 +* (% style="color:red" %)**8**(%%): 8500mAh battery
1227 1227  
1110 +
1228 1228  = 7. ​ Packing Info =
1229 1229  
1230 1230  
... ... @@ -1239,6 +1239,7 @@
1239 1239  * Package Size / pcs : cm
1240 1240  * Weight / pcs : g
1241 1241  
1125 +
1242 1242  = 8.  ​Support =
1243 1243  
1244 1244  * 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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