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Last modified by Xiaoling on 2025/04/27 16:45
From version 169.5
edited by Xiaoling
on 2022/06/15 09:34
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To version 150.18
edited by Xiaoling
on 2022/06/11 08:50
Change comment: There is no comment for this version

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Title
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1 -LDDS20 - LoRaWAN Ultrasonic Liquid Level Sensor User Manual
1 +LDDS75 - LoRaWAN Distance Detection Sensor User Manual
Content
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1 1  (% style="text-align:center" %)
2 -[[image:1655254599445-662.png]]
2 +[[image:1654846127817-788.png]]
3 3  
4 +**Contents:**
4 4  
6 +{{toc/}}
5 5  
6 6  
7 -**Table of Contents:**
8 8  
9 9  
10 10  
... ... @@ -11,76 +11,35 @@
11 11  
12 12  
13 13  
14 -
15 -
16 16  = 1.  Introduction =
17 17  
18 -== 1.1 ​ What is LoRaWAN Ultrasonic liquid level Sensor ==
17 +== 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 -)))
23 +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 -)))
26 +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 -)))
29 +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 -)))
32 +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 -)))
35 +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.
67 -)))
68 -
69 -(((
70 -
71 -)))
72 -)))
73 -
74 -(((
75 -(((
76 76  (% style="color:#4472c4" %) * (%%)Actually lifetime depends on network coverage and uplink interval and other factors.
77 77  )))
78 78  )))
79 -)))
80 -)))
81 81  
82 82  
83 -[[image:1655255122126-327.png]]
43 +[[image:1654847051249-359.png]]
84 84  
85 85  
86 86  
... ... @@ -88,10 +88,9 @@
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)
51 +* Distance Detection by Ultrasonic technology
52 +* Flat object range 280mm - 7500mm
53 +* 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
... ... @@ -98,104 +98,38 @@
98 98  * Uplink on periodically
99 99  * Downlink to change configure
100 100  * IP66 Waterproof Enclosure
101 -* 8500mAh Battery for long term use
60 +* 4000mAh or 8500mAh Battery for long term use
102 102  
103 103  
104 -== 1.3  Suitable Container & Liquid ==
63 +== 1.3  Specification ==
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.
65 +=== 1.3.1  Rated environmental conditions ===
112 112  
67 +[[image:image-20220610154839-1.png]]
113 113  
114 -== 1.4  Mechanical ==
69 +**Remarks: (1) a. When the ambient temperature is 0-39 ℃, the maximum humidity is 90% (non-condensing);**
115 115  
116 -[[image:image-20220615090910-1.png]]
71 +**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)**
117 117  
118 118  
119 -[[image:image-20220615090910-2.png]]
120 120  
75 +=== 1.3.2  Effective measurement range Reference beam pattern ===
121 121  
77 +**(1) The tested object is a white cylindrical tube made of PVC, with a height of 100cm and a diameter of 7.5cm.**
122 122  
123 -== 1.5  Install LDDS20 ==
124 124  
125 125  
126 -(% style="color:blue" %)**Step 1**(%%):  Choose the installation point.
81 +[[image:1654852253176-749.png]]
127 127  
128 -LDDS20 (% style="color:red" %)**MUST**(%%) be installed on the container bottom middle position.
129 129  
130 -[[image:image-20220615091045-3.png]]
131 131  
85 +**(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.**
132 132  
133 133  
134 -(% style="color:blue" %)**Step 2**(%%):  Polish the installation point.
88 +[[image:1654852175653-550.png]](% style="display:none" %) ** **
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.
137 137  
138 -[[image:image-20220615092010-11.png]]
139 139  
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 -[[image:1655256160324-178.png]][[image:image-20220615092327-13.png]]
154 -
155 -
156 -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.
157 -
158 -
159 -(% style="color:red" %)**LED Status:**
160 -
161 -* Onboard LED: When power on device, the onboard LED will fast blink 4 times which means detect the sensor well.
162 -
163 -* (% 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.
164 -* (% style="color:blue" %)BLUE LED(% style="color:red" %) slowly blinking(%%): Sensor detects Liquid Level, The installation point is good.
165 -
166 -LDDS20 will enter into low power mode at 30 seconds after system reset or power on, Blue LED will be off after that.
167 -
168 -
169 -(% style="color:red" %)**Note 2:**
170 -
171 -(% style="color:red" %)Ultrasonic coupling paste (%%) is subjected in most shipping way. So the default package doesn’t include it and user needs to purchase locally.
172 -
173 -
174 -(% style="color:blue" %)**Step4:   **(%%)Install use Epoxy ab glue.
175 -
176 -
177 -Prepare Eproxy AB glue.
178 -
179 -Put Eproxy AB glue in the sensor and press it hard on the container installation point.
180 -
181 -Reset LDDS20 and see if the BLUE LED is slowly blinking.
182 -
183 -[[image:image-20220615091045-8.png||height="226" width="380"]] [[image:image-20220615091045-9.png||height="239" width="339"]]
184 -
185 -(% style="color:red" %)**Note 1:**
186 -
187 -Eproxy AB glue needs 3~~ 5 minutes to stable attached. we can use other glue material to keep it in the position.
188 -
189 -
190 -(% style="color:red" %)**Note 2:**
191 -
192 -(% style="color:red" %)Eproxy AB glue(%%) is subjected in most shipping way. So the default package doesn’t include it and user needs to purchase locally.
193 -
194 -
195 -
196 -
197 -
198 -
199 199  == 1.5 ​ Applications ==
200 200  
201 201  * Horizontal distance measurement
... ... @@ -208,6 +208,8 @@
208 208  * Sewer
209 209  * Bottom water level monitoring
210 210  
104 +
105 +
211 211  == 1.6  Pin mapping and power on ==
212 212  
213 213  
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244 244  )))
245 245  
246 246  (((
247 -
248 -
249 249  (% style="color:blue" %)**Step 1**(%%): Create a device in TTN with the OTAA keys from LDDS75.
250 250  )))
251 251  
... ... @@ -256,19 +256,11 @@
256 256  [[image:image-20220607170145-1.jpeg]]
257 257  
258 258  
259 -(((
260 260  For OTAA registration, we need to set **APP EUI/ APP KEY/ DEV EUI**. Some server might no need to set APP EUI.
261 -)))
262 262  
263 -(((
264 264  Enter these keys in the LoRaWAN Server portal. Below is TTN V3 screen shot:
265 -)))
266 266  
267 -(((
268 -
269 -
270 270  **Add APP EUI in the application**
271 -)))
272 272  
273 273  [[image:image-20220610161353-4.png]]
274 274  
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311 311  == 2.3  ​Uplink Payload ==
312 312  
313 313  (((
314 -(((
315 315  LDDS75 will uplink payload via LoRaWAN with below payload format: 
316 -)))
317 317  
318 -(((
319 319  Uplink payload includes in total 4 bytes.
320 320  Payload for firmware version v1.1.4. . Before v1.1.3, there is on two fields: BAT and Distance
321 321  )))
322 -)))
323 323  
324 324  (((
325 325  
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354 354  
355 355  === 2.3.2  Distance ===
356 356  
357 -(((
358 358  Get the distance. Flat object range 280mm - 7500mm.
359 -)))
360 360  
361 -(((
362 362  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.**
363 -)))
364 364  
365 365  
366 366  * If the sensor value is 0x0000, it means system doesn’t detect ultrasonic sensor.
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394 394  
395 395  === 2.3.5  Sensor Flag ===
396 396  
397 -(((
398 398  0x01: Detect Ultrasonic Sensor
399 -)))
400 400  
401 -(((
402 402  0x00: No Ultrasonic Sensor
403 -)))
404 404  
405 405  
406 406  
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413 413  
414 414  The payload decoder function for TTN V3 is here:
415 415  
416 -(((
417 417  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/]]
418 -)))
419 419  
420 420  
421 421  
... ... @@ -944,17 +944,10 @@
944 944  == 2.8  ​Firmware Change Log ==
945 945  
946 946  
947 -(((
948 948  **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/]]
949 -)))
950 950  
951 -(((
952 -
953 -)))
954 954  
955 -(((
956 956  **Firmware Upgrade Method: **[[Firmware Upgrade Instruction>>doc:Main.Firmware Upgrade Instruction for STM32 base products.WebHome]]
957 -)))
958 958  
959 959  
960 960  
... ... @@ -963,11 +963,9 @@
963 963  
964 964  [[image:image-20220610172003-1.png]]
965 965  
966 -
967 967  [[image:image-20220610172003-2.png]]
968 968  
969 969  
970 -
971 971  == 2.10  Battery Analysis ==
972 972  
973 973  === 2.10.1  Battery Type ===
... ... @@ -978,7 +978,7 @@
978 978  The battery related documents as below:
979 979  
980 980  * (((
981 -[[Battery Dimension>>url:http://www.dragino.com/downloads/index.php?dir=datasheet/Battery/&file=LSN50-Battery-Dimension.pdf]],
843 +[[ Battery Dimension>>url:http://www.dragino.com/downloads/index.php?dir=datasheet/Battery/&file=LSN50-Battery-Dimension.pdf]],
982 982  )))
983 983  * (((
984 984  [[Lithium-Thionyl Chloride Battery  datasheet>>url:https://www.dragino.com/downloads/downloads/datasheet/Battery/ER26500/ER26500_Datasheet-EN.pdf]],
... ... @@ -994,7 +994,7 @@
994 994  === 2.10.2  Replace the battery ===
995 995  
996 996  (((
997 -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.
859 +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.
998 998  )))
999 999  
1000 1000  (((
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1002 1002  )))
1003 1003  
1004 1004  (((
1005 -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)
867 +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)
1006 1006  )))
1007 1007  
1008 1008  
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1017 1017  
1018 1018  * (((
1019 1019  (((
1020 -AT Command Connection: See [[FAQ>>||anchor="H4.A0FAQ"]].
882 +AT Command Connection: See [[FAQ>>||anchor="H7.A0FAQ"]].
1021 1021  )))
1022 1022  )))
1023 1023  * (((
... ... @@ -1098,9 +1098,7 @@
1098 1098  [[image:image-20220610172924-5.png]]
1099 1099  
1100 1100  
1101 -(((
1102 1102  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:
1103 -)))
1104 1104  
1105 1105  
1106 1106   [[image:image-20220610172924-6.png||height="601" width="860"]]
... ... @@ -1124,19 +1124,16 @@
1124 1124  (((
1125 1125  Format: Command Code (0x01) followed by 3 bytes time value.
1126 1126  
1127 -(((
1128 1128  If the downlink payload=0100003C, it means set the END Node’s Transmit Interval to 0x00003C=60(S), while type code is 01.
1129 -)))
1130 1130  
1131 1131  * Example 1: Downlink Payload: 0100001E ~/~/ Set Transmit Interval (TDC) = 30 seconds
1132 1132  * Example 2: Downlink Payload: 0100003C ~/~/ Set Transmit Interval (TDC) = 60 seconds
1133 1133  )))
1134 -)))
1135 1135  
1136 1136  
994 +
995 +)))
1137 1137  
1138 -
1139 -
1140 1140  == 3.3  Set Interrupt Mode ==
1141 1141  
1142 1142  Feature, Set Interrupt mode for GPIO_EXIT.
... ... @@ -1150,9 +1150,7 @@
1150 1150  
1151 1151  Format: Command Code (0x06) followed by 3 bytes.
1152 1152  
1153 -(((
1154 1154  This means that the interrupt mode of the end node is set to 0x000003=3 (rising edge trigger), and the type code is 06.
1155 -)))
1156 1156  
1157 1157  * Example 1: Downlink Payload: 06000000 ~/~/ Turn off interrupt mode
1158 1158  * Example 2: Downlink Payload: 06000003 ~/~/ Set the interrupt mode to rising edge trigger
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