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Last modified by Xiaoling on 2025/04/27 16:45
From version 170.5
edited by Xiaoling
on 2022/06/15 09:46
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To version 151.1
edited by Xiaoling
on 2022/06/11 09:25
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  
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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  
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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
24 +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  (((
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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**. 
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.
35 35  )))
36 36  
37 37  (((
... ... @@ -39,7 +39,7 @@
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.
40 +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.
43 43  )))
44 44  
45 45  (((
... ... @@ -47,7 +47,7 @@
47 47  )))
48 48  
49 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.
48 +LDDS75 is powered by (% style="color:#4472c4" %)** 4000mA or 8500mAh Li-SOCI2 battery**(%%); It is designed for long term use up to 10 years*.
51 51  )))
52 52  
53 53  (((
... ... @@ -55,7 +55,7 @@
55 55  )))
56 56  
57 57  (((
58 -LDDS20 is powered by (% style="color:#4472c4" %)**8500mA Li-SOCI2 battery**(%%); It is designed for long term use up to 10 years*.
56 +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.
59 59  )))
60 60  
61 61  (((
... ... @@ -63,24 +63,13 @@
63 63  )))
64 64  
65 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]]
70 +[[image:1654847051249-359.png]]
84 84  
85 85  
86 86  
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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)
78 +* Distance Detection by Ultrasonic technology
79 +* Flat object range 280mm - 7500mm
80 +* 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
87 +* 4000mAh or 8500mAh Battery for long term use
102 102  
89 +== 1.3  Specification ==
103 103  
91 +=== 1.3.1  Rated environmental conditions ===
104 104  
93 +[[image:image-20220610154839-1.png]]
105 105  
106 -== 1.3  Suitable Container & Liquid ==
95 +(((
96 +**Remarks: (1) a. When the ambient temperature is 0-39 ℃, the maximum humidity is 90% (non-condensing);  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)**
97 +)))
107 107  
108 -* Solid Wall container such as: steel, iron, glass, ceramics, non-foaming plastics etc.
109 -* Container shape is regular, and surface is smooth.
110 -* Container Thickness:
111 -** Pure metal material.  2~~8mm, best is 3~~5mm
112 -** Pure non metal material: <10 mm
113 -* Pure liquid without irregular deposition.
114 114  
115 115  
101 +=== 1.3.2  Effective measurement range Reference beam pattern ===
116 116  
117 -== 1.4  Mechanical ==
103 +**(1) The tested object is a white cylindrical tube made of PVC, with a height of 100cm and a diameter of 7.5cm.**
118 118  
119 -[[image:image-20220615090910-1.png]]
120 120  
121 121  
122 -[[image:image-20220615090910-2.png]]
107 +[[image:1654852253176-749.png]]
123 123  
124 124  
125 125  
126 -== 1.5  Install LDDS20 ==
111 +(((
112 +**(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.**
113 +)))
127 127  
128 128  
129 -(% style="color:blue" %)**Step 1**(%%):  Choose the installation point.
116 +[[image:1654852175653-550.png]](% style="display:none" %) ** **
130 130  
131 -LDDS20 (% style="color:red" %)**MUST**(%%) be installed on the container bottom middle position.
132 132  
133 -[[image:image-20220615091045-3.png]]
134 134  
120 +== 1.5 ​ Applications ==
135 135  
122 +* Horizontal distance measurement
123 +* Liquid level measurement
124 +* Parking management system
125 +* Object proximity and presence detection
126 +* Intelligent trash can management system
127 +* Robot obstacle avoidance
128 +* Automatic control
129 +* Sewer
130 +* Bottom water level monitoring
136 136  
137 -(% style="color:blue" %)**Step 2**(%%):  Polish the installation point.
132 +== 1.6  Pin mapping and power on ==
138 138  
139 -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.
140 140  
141 -[[image:image-20220615092010-11.png]]
135 +[[image:1654847583902-256.png]]
142 142  
143 143  
144 -No polish needed if the container is shine metal surface without paint or non-metal container.
145 145  
146 -[[image:image-20220615092044-12.png]]
139 += 2.  Configure LDDS75 to connect to LoRaWAN network =
147 147  
148 -
149 -(% style="color:blue" %)**Step3:   **(%%)Test the installation point.
150 -
151 -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.
152 -
153 -
154 -It is necessary to put the coupling paste between the sensor and the container, otherwise LDDS20 won’t detect the liquid level.
155 -
156 -[[image:1655256160324-178.png]][[image:image-20220615092327-13.png]]
157 -
158 -
159 -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.
160 -
161 -
162 -(% style="color:red" %)**LED Status:**
163 -
164 -* Onboard LED: When power on device, the onboard LED will fast blink 4 times which means detect the sensor well.
165 -
166 -* (% 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.
167 -* (% style="color:blue" %)BLUE LED(% style="color:red" %) slowly blinking(%%): Sensor detects Liquid Level, The installation point is good.
168 -
169 -LDDS20 will enter into low power mode at 30 seconds after system reset or power on, Blue LED will be off after that.
170 -
171 -
172 -(% style="color:red" %)**Note 2:**
173 -
174 -(% 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.
175 -
176 -
177 -(% style="color:blue" %)**Step4:   **(%%)Install use Epoxy ab glue.
178 -
179 -
180 -Prepare Eproxy AB glue.
181 -
182 -Put Eproxy AB glue in the sensor and press it hard on the container installation point.
183 -
184 -Reset LDDS20 and see if the BLUE LED is slowly blinking.
185 -
186 -[[image:image-20220615091045-8.png||height="226" width="380"]] [[image:image-20220615091045-9.png||height="239" width="339"]]
187 -
188 -
189 -(% style="color:red" %)**Note 1:**
190 -
191 -Eproxy AB glue needs 3~~ 5 minutes to stable attached. we can use other glue material to keep it in the position.
192 -
193 -
194 -(% style="color:red" %)**Note 2:**
195 -
196 -(% 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.
197 -
198 -
199 -
200 -== 1.6 ​ Applications ==
201 -
202 -* Smart liquid control solution.
203 -* Smart liquefied gas solution.
204 -
205 -
206 -== 1.7  Precautions ==
207 -
208 -* 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.
209 -* 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.
210 -* 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.
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 LDDS75. If there is coverage of the LoRaWAN network, it will automatically join the network via OTAA and start to send the sensor value.
144 +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.
148 +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  
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247 247  )))
248 248  
249 249  (((
250 -
251 -
252 252  (% style="color:blue" %)**Step 1**(%%): Create a device in TTN with the OTAA keys from LDDS75.
253 253  )))
254 254  
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268 268  )))
269 269  
270 270  (((
271 -
272 -
273 273  **Add APP EUI in the application**
274 274  )))
275 275  
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944 944  * Solid ON for 5 seconds once device successful Join the network.
945 945  * Blink once when device transmit a packet.
946 946  
861 +
947 947  == 2.8  ​Firmware Change Log ==
948 948  
949 949  
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1134 1134  * Example 1: Downlink Payload: 0100001E ~/~/ Set Transmit Interval (TDC) = 30 seconds
1135 1135  * Example 2: Downlink Payload: 0100003C ~/~/ Set Transmit Interval (TDC) = 60 seconds
1136 1136  )))
1137 -)))
1138 1138  
1139 1139  
1054 +
1055 +)))
1140 1140  
1141 -
1142 -
1143 1143  == 3.3  Set Interrupt Mode ==
1144 1144  
1145 1145  Feature, Set Interrupt mode for GPIO_EXIT.
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1160 1160  * Example 1: Downlink Payload: 06000000 ~/~/ Turn off interrupt mode
1161 1161  * Example 2: Downlink Payload: 06000003 ~/~/ Set the interrupt mode to rising edge trigger
1162 1162  
1077 +
1078 +
1163 1163  = 4.  FAQ =
1164 1164  
1165 1165  == 4.1  What is the frequency plan for LDDS75? ==
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1219 1219  * (% style="color:red" %)**4 **(%%)**: **4000mAh battery
1220 1220  * (% style="color:red" %)**8 **(%%)**:** 8500mAh battery
1221 1221  
1138 +
1139 +
1222 1222  = 7. ​ Packing Info =
1223 1223  
1224 1224  
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1233 1233  * Package Size / pcs : cm
1234 1234  * Weight / pcs : g
1235 1235  
1154 +
1155 +
1236 1236  = 8.  ​Support =
1237 1237  
1238 1238  * 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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