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Last modified by Xiaoling on 2025/04/27 16:45
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edited by Xiaoling
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edited by Xiaoling
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Title
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1 -LDDS75 - LoRaWAN Distance Detection Sensor User Manual
1 +LDDS20 - LoRaWAN Ultrasonic Liquid Level Sensor User Manual
Content
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1 1  (% style="text-align:center" %)
2 -[[image:1654846127817-788.png]]
2 +[[image:1655254599445-662.png]]
3 3  
4 -**Contents:**
5 5  
6 -{{toc/}}
7 7  
8 8  
7 +**Table of Contents:**
9 9  
10 10  
11 11  
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12 12  
13 13  
14 14  
14 +
15 +
15 15  = 1.  Introduction =
16 16  
17 -== 1.1 ​ What is LoRaWAN Distance Detection Sensor ==
18 +== 1.1 ​ What is LoRaWAN Ultrasonic liquid level Sensor ==
18 18  
19 19  (((
20 20  
21 21  
22 22  (((
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.
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 +)))
24 24  
29 +(((
30 +
31 +)))
25 25  
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.
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 +)))
27 27  
37 +(((
38 +
39 +)))
28 28  
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.
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 +)))
30 30  
45 +(((
46 +
47 +)))
31 31  
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*.
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 +)))
33 33  
53 +(((
54 +
55 +)))
34 34  
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.
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 +)))
36 36  
61 +(((
62 +
63 +)))
37 37  
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 +(((
38 38  (% style="color:#4472c4" %) * (%%)Actually lifetime depends on network coverage and uplink interval and other factors.
39 39  )))
40 40  )))
79 +)))
80 +)))
41 41  
42 42  
43 -[[image:1654847051249-359.png]]
83 +[[image:1655255122126-327.png]]
44 44  
45 45  
46 46  
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48 48  
49 49  * LoRaWAN 1.0.3 Class A
50 50  * Ultra low power consumption
51 -* Distance Detection by Ultrasonic technology
52 -* Flat object range 280mm - 7500mm
53 -* Accuracy: ±(1cm+S*0.3%) (S: Distance)
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)
54 54  * Cable Length : 25cm
55 55  * Bands: CN470/EU433/KR920/US915/EU868/AS923/AU915/IN865
56 56  * AT Commands to change parameters
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57 57  * Uplink on periodically
58 58  * Downlink to change configure
59 59  * IP66 Waterproof Enclosure
60 -* 4000mAh or 8500mAh Battery for long term use
101 +* 8500mAh Battery for long term use
61 61  
62 -== 1.3  Specification ==
63 63  
64 -=== 1.3.1  Rated environmental conditions ===
104 +== 1.3  Suitable Container & Liquid ==
65 65  
66 -[[image:image-20220610154839-1.png]]
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.
67 67  
68 -**Remarks: (1) a. When the ambient temperature is 0-39 ℃, the maximum humidity is 90% (non-condensing);**
69 69  
70 -**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)**
114 +== 1.4  Mechanical ==
71 71  
116 +[[image:image-20220615090910-1.png]]
72 72  
73 73  
74 -=== 1.3.2  Effective measurement range Reference beam pattern ===
119 +[[image:image-20220615090910-2.png]]
75 75  
76 -**(1) The tested object is a white cylindrical tube made of PVC, with a height of 100cm and a diameter of 7.5cm.**
77 77  
78 78  
123 +== 1.5  Install LDDS20 ==
79 79  
80 -[[image:1654852253176-749.png]]
81 81  
126 +(% style="color:blue" %)**Step 1**(%%):  Choose the installation point.
82 82  
128 +LDDS20 (% style="color:red" %)**MUST**(%%) be installed on the container bottom middle position.
83 83  
84 -**(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.**
130 +[[image:image-20220615091045-3.png]]
85 85  
86 86  
87 -[[image:1654852175653-550.png]](% style="display:none" %) ** **
88 88  
134 +(% style="color:blue" %)**Step 2**(%%): Polish the installation point.
89 89  
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.
90 90  
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 +
91 91  == 1.5 ​ Applications ==
92 92  
93 93  * Horizontal distance measurement
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136 136  )))
137 137  
138 138  (((
256 +
257 +
139 139  (% style="color:blue" %)**Step 1**(%%): Create a device in TTN with the OTAA keys from LDDS75.
140 140  )))
141 141  
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146 146  [[image:image-20220607170145-1.jpeg]]
147 147  
148 148  
268 +(((
149 149  For OTAA registration, we need to set **APP EUI/ APP KEY/ DEV EUI**. Some server might no need to set APP EUI.
270 +)))
150 150  
272 +(((
151 151  Enter these keys in the LoRaWAN Server portal. Below is TTN V3 screen shot:
274 +)))
152 152  
276 +(((
277 +
278 +
153 153  **Add APP EUI in the application**
280 +)))
154 154  
155 155  [[image:image-20220610161353-4.png]]
156 156  
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193 193  == 2.3  ​Uplink Payload ==
194 194  
195 195  (((
323 +(((
196 196  LDDS75 will uplink payload via LoRaWAN with below payload format: 
325 +)))
197 197  
327 +(((
198 198  Uplink payload includes in total 4 bytes.
199 199  Payload for firmware version v1.1.4. . Before v1.1.3, there is on two fields: BAT and Distance
200 200  )))
331 +)))
201 201  
202 202  (((
203 203  
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232 232  
233 233  === 2.3.2  Distance ===
234 234  
366 +(((
235 235  Get the distance. Flat object range 280mm - 7500mm.
368 +)))
236 236  
370 +(((
237 237  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 +)))
238 238  
239 239  
240 240  * If the sensor value is 0x0000, it means system doesn’t detect ultrasonic sensor.
241 241  * 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.
242 242  
243 -
244 244  === 2.3.3  Interrupt Pin ===
245 245  
246 246  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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269 269  
270 270  === 2.3.5  Sensor Flag ===
271 271  
406 +(((
272 272  0x01: Detect Ultrasonic Sensor
408 +)))
273 273  
410 +(((
274 274  0x00: No Ultrasonic Sensor
412 +)))
275 275  
276 276  
277 277  
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284 284  
285 285  The payload decoder function for TTN V3 is here:
286 286  
425 +(((
287 287  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 +)))
288 288  
289 289  
290 290  
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810 810  * Solid ON for 5 seconds once device successful Join the network.
811 811  * Blink once when device transmit a packet.
812 812  
813 -
814 814  == 2.8  ​Firmware Change Log ==
815 815  
816 816  
956 +(((
817 817  **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 +)))
818 818  
960 +(((
961 +
962 +)))
819 819  
964 +(((
820 820  **Firmware Upgrade Method: **[[Firmware Upgrade Instruction>>doc:Main.Firmware Upgrade Instruction for STM32 base products.WebHome]]
966 +)))
821 821  
822 822  
823 823  
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961 961  [[image:image-20220610172924-5.png]]
962 962  
963 963  
1110 +(((
964 964  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 +)))
965 965  
966 966  
967 967   [[image:image-20220610172924-6.png||height="601" width="860"]]
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985 985  (((
986 986  Format: Command Code (0x01) followed by 3 bytes time value.
987 987  
1136 +(((
988 988  If the downlink payload=0100003C, it means set the END Node’s Transmit Interval to 0x00003C=60(S), while type code is 01.
1138 +)))
989 989  
990 990  * Example 1: Downlink Payload: 0100001E ~/~/ Set Transmit Interval (TDC) = 30 seconds
991 991  * Example 2: Downlink Payload: 0100003C ~/~/ Set Transmit Interval (TDC) = 60 seconds
992 992  )))
1143 +)))
993 993  
994 994  
995 -
996 -)))
997 997  
1147 +
1148 +
998 998  == 3.3  Set Interrupt Mode ==
999 999  
1000 1000  Feature, Set Interrupt mode for GPIO_EXIT.
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1008 1008  
1009 1009  Format: Command Code (0x06) followed by 3 bytes.
1010 1010  
1162 +(((
1011 1011  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 +)))
1012 1012  
1013 1013  * Example 1: Downlink Payload: 06000000 ~/~/ Turn off interrupt mode
1014 1014  * Example 2: Downlink Payload: 06000003 ~/~/ Set the interrupt mode to rising edge trigger
1015 1015  
1016 -
1017 -
1018 1018  = 4.  FAQ =
1019 1019  
1020 1020  == 4.1  What is the frequency plan for LDDS75? ==
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1074 1074  * (% style="color:red" %)**4 **(%%)**: **4000mAh battery
1075 1075  * (% style="color:red" %)**8 **(%%)**:** 8500mAh battery
1076 1076  
1077 -
1078 -
1079 1079  = 7. ​ Packing Info =
1080 1080  
1081 1081  
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1090 1090  * Package Size / pcs : cm
1091 1091  * Weight / pcs : g
1092 1092  
1093 -
1094 -
1095 1095  = 8.  ​Support =
1096 1096  
1097 1097  * 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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