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Last modified by Xiaoling on 2025/04/27 16:45
From version 167.2
edited by Xiaoling
on 2022/06/15 09:21
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To version 150.49
edited by Xiaoling
on 2022/06/11 09:18
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  (((
... ... @@ -31,7 +31,7 @@
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  
103 103  
104 -== 1.3  Suitable Container & Liquid ==
90 +== 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.
92 +=== 1.3.1  Rated environmental conditions ===
112 112  
94 +[[image:image-20220610154839-1.png]]
113 113  
114 -== 1.4  Mechanical ==
96 +(((
97 +**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)**
98 +)))
115 115  
116 -[[image:image-20220615090910-1.png]]
117 117  
118 118  
119 -[[image:image-20220615090910-2.png]]
102 +=== 1.3.2  Effective measurement range Reference beam pattern ===
120 120  
104 +**(1) The tested object is a white cylindrical tube made of PVC, with a height of 100cm and a diameter of 7.5cm.**
121 121  
122 122  
123 -== 1.5  Install LDDS20 ==
124 124  
108 +[[image:1654852253176-749.png]]
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.
129 129  
130 -[[image:image-20220615091045-3.png]]
131 -
132 -
133 -
134 -(% style="color:blue" %)**Step 2**(%%): Polish the installation point.
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 -
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
112 +(((
113 +**(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.**
157 157  )))
158 158  
159 -[[image:image-20220615091045-6.png]] [[image:image-20220615091045-7.png]]
160 160  
117 +[[image:1654852175653-550.png]](% style="display:none" %) ** **
161 161  
162 162  
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.
164 164  
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 -
208 208  == 1.5 ​ Applications ==
209 209  
210 210  * Horizontal distance measurement
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217 217  * Sewer
218 218  * Bottom water level monitoring
219 219  
133 +
134 +
220 220  == 1.6  Pin mapping and power on ==
221 221  
222 222  
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253 253  )))
254 254  
255 255  (((
256 -
257 -
258 258  (% style="color:blue" %)**Step 1**(%%): Create a device in TTN with the OTAA keys from LDDS75.
259 259  )))
260 260  
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274 274  )))
275 275  
276 276  (((
277 -
278 -
279 279  **Add APP EUI in the application**
280 280  )))
281 281  
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375 375  * If the sensor value is 0x0000, it means system doesn’t detect ultrasonic sensor.
376 376  * 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.
377 377  
289 +
290 +
291 +
378 378  === 2.3.3  Interrupt Pin ===
379 379  
380 380  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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403 403  
404 404  === 2.3.5  Sensor Flag ===
405 405  
406 -(((
407 407  0x01: Detect Ultrasonic Sensor
408 -)))
409 409  
410 -(((
411 411  0x00: No Ultrasonic Sensor
412 -)))
413 413  
414 414  
415 415  
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422 422  
423 423  The payload decoder function for TTN V3 is here:
424 424  
425 -(((
426 426  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 -)))
428 428  
429 429  
430 430  
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953 953  == 2.8  ​Firmware Change Log ==
954 954  
955 955  
956 -(((
957 957  **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 -)))
959 959  
960 -(((
961 -
962 -)))
963 963  
964 -(((
965 965  **Firmware Upgrade Method: **[[Firmware Upgrade Instruction>>doc:Main.Firmware Upgrade Instruction for STM32 base products.WebHome]]
966 -)))
967 967  
968 968  
969 969  
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1107 1107  [[image:image-20220610172924-5.png]]
1108 1108  
1109 1109  
1110 -(((
1111 1111  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 -)))
1113 1113  
1114 1114  
1115 1115   [[image:image-20220610172924-6.png||height="601" width="860"]]
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1133 1133  (((
1134 1134  Format: Command Code (0x01) followed by 3 bytes time value.
1135 1135  
1136 -(((
1137 1137  If the downlink payload=0100003C, it means set the END Node’s Transmit Interval to 0x00003C=60(S), while type code is 01.
1138 -)))
1139 1139  
1140 1140  * Example 1: Downlink Payload: 0100001E ~/~/ Set Transmit Interval (TDC) = 30 seconds
1141 1141  * Example 2: Downlink Payload: 0100003C ~/~/ Set Transmit Interval (TDC) = 60 seconds
1142 1142  )))
1143 -)))
1144 1144  
1145 1145  
1042 +
1043 +)))
1146 1146  
1147 -
1148 -
1149 1149  == 3.3  Set Interrupt Mode ==
1150 1150  
1151 1151  Feature, Set Interrupt mode for GPIO_EXIT.
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1159 1159  
1160 1160  Format: Command Code (0x06) followed by 3 bytes.
1161 1161  
1162 -(((
1163 1163  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 -)))
1165 1165  
1166 1166  * Example 1: Downlink Payload: 06000000 ~/~/ Turn off interrupt mode
1167 1167  * Example 2: Downlink Payload: 06000003 ~/~/ Set the interrupt mode to rising edge trigger
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