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Last modified by Mengting Qiu on 2025/08/06 17:02
From version 172.8
edited by Xiaoling
on 2022/06/15 10:04
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To version 154.1
edited by Xiaoling
on 2022/06/15 08:56
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Title
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1 -LDDS20 - LoRaWAN Ultrasonic Liquid Level Sensor User Manual
1 +LDDS20 - LoRaWAN Liquid Level 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 4  
5 5  
6 6  
7 +
7 7  **Table of Contents:**
8 8  
10 +{{toc/}}
9 9  
10 10  
11 11  
... ... @@ -13,9 +13,10 @@
13 13  
14 14  
15 15  
18 +
16 16  = 1.  Introduction =
17 17  
18 -== 1.1 ​ What is LoRaWAN Ultrasonic liquid level Sensor ==
21 +== 1.1 ​ What is LoRaWAN Distance Detection Sensor ==
19 19  
20 20  (((
21 21  
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22 22  
23 23  (((
24 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
28 +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.
27 27  )))
28 28  
29 29  (((
30 -
32 +It detects the distance** (% style="color:#4472c4" %) between the measured object and the sensor(%%)**, and uploads the value via wireless to LoRaWAN IoT Server.
31 31  )))
32 32  
33 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**. 
36 +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.
35 35  )))
36 36  
37 37  (((
38 -
40 +LDDS75 is powered by (% style="color:#4472c4" %)** 4000mA or 8500mAh Li-SOCI2 battery**(%%); It is designed for long term use up to 10 years*.
39 39  )))
40 40  
41 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.
44 +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.
43 43  )))
44 44  
45 45  (((
46 -
47 -)))
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 -)))
52 -
53 -(((
54 -
55 -)))
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 -)))
60 -
61 -(((
62 -
63 -)))
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 79  )))
80 -)))
81 81  
82 82  
83 -[[image:1655255122126-327.png]]
54 +[[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)
62 +* Distance Detection by Ultrasonic technology
63 +* Flat object range 280mm - 7500mm
64 +* 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
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98 98  * Uplink on periodically
99 99  * Downlink to change configure
100 100  * IP66 Waterproof Enclosure
101 -* 8500mAh Battery for long term use
71 +* 4000mAh or 8500mAh Battery for long term use
102 102  
103 103  
104 -== 1.3  Suitable Container & Liquid ==
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.
75 +== 1.3  Specification ==
112 112  
77 +=== 1.3.1  Rated environmental conditions ===
113 113  
114 -== 1.4  Mechanical ==
79 +[[image:image-20220610154839-1.png]]
115 115  
116 -[[image:image-20220615090910-1.png]]
81 +(((
82 +**Remarks: (1) a. When the ambient temperature is 0-39 ℃, the maximum humidity is 90% (non-condensing);  **
117 117  
84 +**~ 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)**
85 +)))
118 118  
119 -[[image:image-20220615090910-2.png]]
120 120  
121 121  
89 +=== 1.3.2  Effective measurement range Reference beam pattern ===
122 122  
123 -== 1.5  Install LDDS20 ==
91 +**(1) The tested object is a white cylindrical tube made of PVC, with a height of 100cm and a diameter of 7.5cm.**
124 124  
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.
95 +[[image:1654852253176-749.png]]
129 129  
130 -[[image:image-20220615091045-3.png]]
131 131  
132 132  
99 +(((
100 +**(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.**
101 +)))
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.
104 +[[image:1654852175653-550.png]](% style="display:none" %) ** **
137 137  
138 -[[image:image-20220615092010-11.png]]
139 139  
140 140  
141 -No polish needed if the container is shine metal surface without paint or non-metal container.
108 +== 1.5 ​ Applications ==
142 142  
143 -[[image:image-20220615092044-12.png]]
110 +* Horizontal distance measurement
111 +* Liquid level measurement
112 +* Parking management system
113 +* Object proximity and presence detection
114 +* Intelligent trash can management system
115 +* Robot obstacle avoidance
116 +* Automatic control
117 +* Sewer
118 +* Bottom water level monitoring
144 144  
145 145  
146 146  
147 -(% style="color:blue" %)**Step3:   **(%%)Test the installation point.
122 +== 1.6  Pin mapping and power on ==
148 148  
149 -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.
150 150  
125 +[[image:1654847583902-256.png]]
151 151  
152 -It is necessary to put the coupling paste between the sensor and the container, otherwise LDDS20 won’t detect the liquid level.
153 153  
154 -[[image:1655256160324-178.png]][[image:image-20220615092327-13.png]]
155 155  
129 += 2.  Configure LDDS75 to connect to LoRaWAN network =
156 156  
157 -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.
158 -
159 -
160 -(% style="color:red" %)**LED Status:**
161 -
162 -* Onboard LED: When power on device, the onboard LED will fast blink 4 times which means detect the sensor well.
163 -
164 -* (% 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.
165 -* (% style="color:blue" %)BLUE LED(% style="color:red" %) slowly blinking(%%): Sensor detects Liquid Level, The installation point is good.
166 -
167 -LDDS20 will enter into low power mode at 30 seconds after system reset or power on, Blue LED will be off after that.
168 -
169 -
170 -(% style="color:red" %)**Note 2:**
171 -
172 -(% 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.
173 -
174 -
175 -
176 -(% style="color:blue" %)**Step4:   **(%%)Install use Epoxy ab glue.
177 -
178 -Prepare Eproxy AB glue.
179 -
180 -Put Eproxy AB glue in the sensor and press it hard on the container installation point.
181 -
182 -Reset LDDS20 and see if the BLUE LED is slowly blinking.
183 -
184 -[[image:image-20220615091045-8.png||height="226" width="380"]] [[image:image-20220615091045-9.png||height="239" width="339"]]
185 -
186 -
187 -(% style="color:red" %)**Note 1:**
188 -
189 -Eproxy AB glue needs 3~~ 5 minutes to stable attached. we can use other glue material to keep it in the position.
190 -
191 -
192 -(% style="color:red" %)**Note 2:**
193 -
194 -(% 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.
195 -
196 -
197 -
198 -== 1.6 ​ Applications ==
199 -
200 -* Smart liquid control solution.
201 -* Smart liquefied gas solution.
202 -
203 -
204 -
205 -== 1.7  Precautions ==
206 -
207 -* 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.
208 -* 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.
209 -* 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.
210 -
211 -
212 -
213 -== 1.8  Pin mapping and power on ==
214 -
215 -
216 -[[image:1655257026882-201.png]]
217 -
218 -
219 -
220 -= 2.  Configure LDDS20 to connect to LoRaWAN network =
221 -
222 -
223 223  == 2.1  How it works ==
224 224  
225 225  (((
226 -The LDDS20 is configured as LoRaWAN OTAA Class A mode by default. It has OTAA keys to join LoRaWAN network. To connect a LoRaWAN network, you need to input the OTAA keys in the LoRaWAN IoT server and power on the LDDS20. If there is coverage of the LoRaWAN network, it will automatically join the network via OTAA and start to send the sensor value.
134 +The LDDS75 is configured as LoRaWAN OTAA Class A mode by default. It has OTAA keys to join LoRaWAN network. To connect a LoRaWAN network, you need to input the OTAA keys in the LoRaWAN IoT server and power on the LDDS75. If there is coverage of the LoRaWAN network, it will automatically join the network via OTAA and start to send the sensor value
227 227  )))
228 228  
229 229  (((
230 -In case you can't set the OTAA keys in the LoRaWAN OTAA server, and you have to use the keys from the server, you can [[use AT Commands >>||anchor="H3.A0UsingtheATCommands"]]to set the keys in the LDDS20.
138 +In case you can't set the OTAA keys in the LoRaWAN OTAA server, and you have to use the keys from the server, you can [[use AT Commands >>||anchor="H3.A0ConfigureLDDS75viaATCommandorLoRaWANDownlink"]]to set the keys in the LDDS75.
231 231  )))
232 232  
233 233  
... ... @@ -239,7 +239,7 @@
239 239  )))
240 240  
241 241  (((
242 -[[image:1655257698953-697.png]]
150 +[[image:1654848616367-242.png]]
243 243  )))
244 244  
245 245  (((
... ... @@ -249,11 +249,11 @@
249 249  (((
250 250  
251 251  
252 -(% style="color:blue" %)**Step 1**(%%): Create a device in TTN with the OTAA keys from LDDS20.
160 +(% style="color:blue" %)**Step 1**(%%): Create a device in TTN with the OTAA keys from LDDS75.
253 253  )))
254 254  
255 255  (((
256 -Each LDDS20 is shipped with a sticker with the default device keys, user can find this sticker in the box. it looks like below.
164 +Each LDDS75 is shipped with a sticker with the default device keys, user can find this sticker in the box. it looks like below.
257 257  )))
258 258  
259 259  [[image:image-20220607170145-1.jpeg]]
... ... @@ -283,7 +283,6 @@
283 283  [[image:image-20220610161353-7.png]]
284 284  
285 285  
286 -
287 287  You can also choose to create the device manually.
288 288  
289 289   [[image:image-20220610161538-8.png]]
... ... @@ -296,17 +296,16 @@
296 296  
297 297  
298 298  
299 -(% style="color:blue" %)**Step 2**(%%):  Power on LDDS20
206 +(% style="color:blue" %)**Step 2**(%%): Power on LDDS75
300 300  
301 301  
302 302  Put a Jumper on JP2 to power on the device. ( The Switch must be in FLASH position).
303 303  
304 -[[image:image-20220615095102-14.png]]
211 +[[image:image-20220610161724-10.png]]
305 305  
306 306  
307 -
308 308  (((
309 -(% style="color:blue" %)**Step 3**(%%)**:**  The LDDS20 will auto join to the TTN network. After join success, it will start to upload messages to TTN and you can see the messages in the panel.
215 +(% style="color:blue" %)**Step 3**(%%)**:** The LDDS75 will auto join to the TTN network. After join success, it will start to upload messages to TTN and you can see the messages in the panel.
310 310  )))
311 311  
312 312  [[image:1654849068701-275.png]]
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317 317  
318 318  (((
319 319  (((
320 -LDDS20 will uplink payload via LoRaWAN with below payload format: 
226 +LDDS75 will uplink payload via LoRaWAN with below payload format: 
227 +)))
321 321  
322 -Uplink payload includes in total 8 bytes.
323 -Payload for firmware version v1.1.4. . Before v1.1.3, there is only 5 bytes: BAT and Distance(Please check manual v1.2.0 if you have 5 bytes payload).
229 +(((
230 +Uplink payload includes in total 4 bytes.
231 +Payload for firmware version v1.1.4. . Before v1.1.3, there is on two fields: BAT and Distance
324 324  )))
325 325  )))
326 326  
... ... @@ -347,7 +347,7 @@
347 347  === 2.3.1  Battery Info ===
348 348  
349 349  
350 -Check the battery voltage for LDDS20.
258 +Check the battery voltage for LDDS75.
351 351  
352 352  Ex1: 0x0B45 = 2885mV
353 353  
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358 358  === 2.3.2  Distance ===
359 359  
360 360  (((
361 -Get the distance. Flat object range 20mm - 2000mm.
269 +Get the distance. Flat object range 280mm - 7500mm.
362 362  )))
363 363  
364 364  (((
365 -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" %)** 0605(H) = 1541 (D) = 1541 mm.**
273 +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.**
366 366  )))
367 367  
368 -* If the sensor value is 0x0000, it means system doesn't detect ultrasonic sensor.
369 -* If the sensor value lower than 0x0014 (20mm), the sensor value will be invalid.
370 370  
277 +* If the sensor value is 0x0000, it means system doesn’t detect ultrasonic sensor.
278 +* 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.
371 371  
372 372  
281 +
373 373  === 2.3.3  Interrupt Pin ===
374 374  
375 -This data field shows if this packet is generated by interrupt or not. [[Click here>>||anchor="H3.2A0SetInterruptMode"]] for the hardware and software set up.
284 +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.
376 376  
377 377  **Example:**
378 378  
... ... @@ -418,7 +418,7 @@
418 418  The payload decoder function for TTN V3 is here:
419 419  
420 420  (((
421 -LDDS20 TTN V3 Payload Decoder: [[http:~~/~~/www.dragino.com/downloads/index.php?dir=LoRa_End_Node/LDDS20/Payload_Decoder/>>url:http://www.dragino.com/downloads/index.php?dir=LoRa_End_Node/LSE01/Payload_Decoder/]]
330 +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/]]
422 422  )))
423 423  
424 424  
... ... @@ -945,6 +945,8 @@
945 945  * Solid ON for 5 seconds once device successful Join the network.
946 946  * Blink once when device transmit a packet.
947 947  
857 +
858 +
948 948  == 2.8  ​Firmware Change Log ==
949 949  
950 950  
... ... @@ -1161,6 +1161,8 @@
1161 1161  * Example 1: Downlink Payload: 06000000 ~/~/ Turn off interrupt mode
1162 1162  * Example 2: Downlink Payload: 06000003 ~/~/ Set the interrupt mode to rising edge trigger
1163 1163  
1075 +
1076 +
1164 1164  = 4.  FAQ =
1165 1165  
1166 1166  == 4.1  What is the frequency plan for LDDS75? ==
... ... @@ -1220,6 +1220,8 @@
1220 1220  * (% style="color:red" %)**4 **(%%)**: **4000mAh battery
1221 1221  * (% style="color:red" %)**8 **(%%)**:** 8500mAh battery
1222 1222  
1136 +
1137 +
1223 1223  = 7. ​ Packing Info =
1224 1224  
1225 1225  
... ... @@ -1234,6 +1234,8 @@
1234 1234  * Package Size / pcs : cm
1235 1235  * Weight / pcs : g
1236 1236  
1152 +
1153 +
1237 1237  = 8.  ​Support =
1238 1238  
1239 1239  * 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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