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Last modified by Xiaoling on 2025/04/27 16:45
From version 169.4
edited by Xiaoling
on 2022/06/15 09:28
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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  
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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  
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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)
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  
104 104  
105 -== 1.3  Suitable Container & Liquid ==
75 +== 1.3  Specification ==
106 106  
107 -* Solid Wall container such as: steel, iron, glass, ceramics, non-foaming plastics etc.
108 -* Container shape is regular, and surface is smooth.
109 -* Container Thickness:
110 -** Pure metal material.  2~~8mm, best is 3~~5mm
111 -** Pure non metal material: <10 mm
112 -* Pure liquid without irregular deposition.
77 +=== 1.3.1  Rated environmental conditions ===
113 113  
79 +[[image:image-20220610154839-1.png]]
114 114  
81 +(((
82 +**Remarks: (1) a. When the ambient temperature is 0-39 ℃, the maximum humidity is 90% (non-condensing);  **
115 115  
116 -== 1.4  Mechanical ==
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 +)))
117 117  
118 -[[image:image-20220615090910-1.png]]
119 119  
120 120  
121 -[[image:image-20220615090910-2.png]]
89 +=== 1.3.2  Effective measurement range Reference beam pattern ===
122 122  
91 +**(1) The tested object is a white cylindrical tube made of PVC, with a height of 100cm and a diameter of 7.5cm.**
123 123  
124 124  
125 -== 1.5  Install LDDS20 ==
126 126  
95 +[[image:1654852253176-749.png]]
127 127  
128 -(% style="color:blue" %)**Step 1**(%%):  Choose the installation point.
129 129  
130 -LDDS20 (% style="color:red" %)**MUST**(%%) be installed on the container bottom middle position.
131 131  
132 -[[image:image-20220615091045-3.png]]
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  
134 134  
104 +[[image:1654852175653-550.png]](% style="display:none" %) ** **
135 135  
136 -(% style="color:blue" %)**Step 2**(%%):  Polish the installation point.
137 137  
138 -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.
139 139  
140 -[[image:image-20220615092010-11.png]]
141 -
142 -
143 -No polish needed if the container is shine metal surface without paint or non-metal container.
144 -
145 -[[image:image-20220615092044-12.png]]
146 -
147 -
148 -(% style="color:blue" %)**Step3:  **(%%)Test the installation point.
149 -
150 -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.
151 -
152 -
153 -It is necessary to put the coupling paste between the sensor and the container, otherwise LDDS20 won’t detect the liquid level.
154 -
155 -[[image:1655256160324-178.png]][[image:image-20220615092327-13.png]]
156 -
157 -
158 -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.
159 -
160 -
161 -(% style="color:red" %)**LED Status:**
162 -
163 -* Onboard LED: When power on device, the onboard LED will fast blink 4 times which means detect the sensor well.
164 -
165 -* (% 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.
166 -* (% style="color:blue" %)BLUE LED(% style="color:red" %) slowly blinking(%%): Sensor detects Liquid Level, The installation point is good.
167 -
168 -LDDS20 will enter into low power mode at 30 seconds after system reset or power on, Blue LED will be off after that.
169 -
170 -
171 -(% style="color:red" %)**Note 2:**
172 -
173 -(% 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.
174 -
175 -
176 -(% style="color:blue" %)**Step4:  **(%%)Install use Epoxy ab glue.
177 -
178 -[[image:image-20220615091045-8.png]]
179 -
180 -Prepare Eproxy AB glue.
181 -
182 -
183 -Put Eproxy AB glue in the sensor and press it hard on the container installation point.
184 -
185 -
186 -Reset LDDS20 and see if the BLUE LED is slowly blinking.
187 -
188 -[[image:image-20220615091045-9.png]]
189 -
190 -(% style="color:red" %)Note1:
191 -
192 -Eproxy AB glue needs 3~~ 5 minutes to stable attached. we can use other glue material to keep it in the position.
193 -
194 -
195 -(% style="color:red" %)Note 2:
196 -
197 -(% 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.
198 -
199 -
200 -
201 -
202 -
203 -
204 204  == 1.5 ​ Applications ==
205 205  
206 206  * Horizontal distance measurement
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213 213  * Sewer
214 214  * Bottom water level monitoring
215 215  
120 +
121 +
216 216  == 1.6  Pin mapping and power on ==
217 217  
218 218  
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371 371  * If the sensor value is 0x0000, it means system doesn’t detect ultrasonic sensor.
372 372  * 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.
373 373  
280 +
281 +
374 374  === 2.3.3  Interrupt Pin ===
375 375  
376 376  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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946 946  * Solid ON for 5 seconds once device successful Join the network.
947 947  * Blink once when device transmit a packet.
948 948  
857 +
858 +
949 949  == 2.8  ​Firmware Change Log ==
950 950  
951 951  
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1162 1162  * Example 1: Downlink Payload: 06000000 ~/~/ Turn off interrupt mode
1163 1163  * Example 2: Downlink Payload: 06000003 ~/~/ Set the interrupt mode to rising edge trigger
1164 1164  
1075 +
1076 +
1165 1165  = 4.  FAQ =
1166 1166  
1167 1167  == 4.1  What is the frequency plan for LDDS75? ==
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1221 1221  * (% style="color:red" %)**4 **(%%)**: **4000mAh battery
1222 1222  * (% style="color:red" %)**8 **(%%)**:** 8500mAh battery
1223 1223  
1136 +
1137 +
1224 1224  = 7. ​ Packing Info =
1225 1225  
1226 1226  
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1235 1235  * Package Size / pcs : cm
1236 1236  * Weight / pcs : g
1237 1237  
1152 +
1153 +
1238 1238  = 8.  ​Support =
1239 1239  
1240 1240  * 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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