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Last modified by Mengting Qiu on 2025/08/06 17:02
From version 154.3
edited by Xiaoling
on 2022/06/15 09:04
Change comment: There is no comment for this version
To version 173.3
edited by Xiaoling
on 2022/06/15 10:11
Change comment: There is no comment for this version

Summary

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80 80  )))
81 81  
82 82  
83 -[[image:1654847051249-359.png]]
83 +[[image:1655255122126-327.png]]
84 84  
85 85  
86 86  
... ... @@ -88,9 +88,10 @@
88 88  
89 89  * LoRaWAN 1.0.3 Class A
90 90  * Ultra low power consumption
91 -* Distance Detection by Ultrasonic technology
92 -* Flat object range 280mm - 7500mm
93 -* 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)
94 94  * Cable Length : 25cm
95 95  * Bands: CN470/EU433/KR920/US915/EU868/AS923/AU915/IN865
96 96  * AT Commands to change parameters
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97 97  * Uplink on periodically
98 98  * Downlink to change configure
99 99  * IP66 Waterproof Enclosure
100 -* 4000mAh or 8500mAh Battery for long term use
101 +* 8500mAh Battery for long term use
101 101  
102 -== 1.3  Specification ==
103 +== 1.3  Suitable Container & Liquid ==
103 103  
104 -=== 1.3.1  Rated environmental conditions ===
105 +* Solid Wall container such as: steel, iron, glass, ceramics, non-foaming plastics etc.
106 +* Container shape is regular, and surface is smooth.
107 +* Container Thickness:
108 +** Pure metal material.  2~~8mm, best is 3~~5mm
109 +** Pure non metal material: <10 mm
110 +* Pure liquid without irregular deposition.
105 105  
106 -[[image:image-20220610154839-1.png]]
112 +== 1.4  Mechanical ==
107 107  
108 -(((
109 -**Remarks: (1) a. When the ambient temperature is 0-39 ℃, the maximum humidity is 90% (non-condensing);       **
114 +[[image:image-20220615090910-1.png]]
110 110  
111 -**~ 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)**
112 -)))
113 113  
117 +[[image:image-20220615090910-2.png]]
114 114  
115 115  
116 -=== 1.3.2  Effective measurement range Reference beam pattern ===
117 117  
118 -**(1) The tested object is a white cylindrical tube made of PVC, with a height of 100cm and a diameter of 7.5cm.**
121 +== 1.5  Install LDDS20 ==
119 119  
120 120  
124 +(% style="color:blue" %)**Step 1**(%%):  Choose the installation point.
121 121  
122 -[[image:1654852253176-749.png]]
126 +LDDS20 (% style="color:red" %)**MUST**(%%) be installed on the container bottom middle position.
123 123  
128 +[[image:image-20220615091045-3.png]]
124 124  
125 125  
126 -(((
127 -**(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.**
128 -)))
129 129  
132 +(% style="color:blue" %)**Step 2**(%%):  Polish the installation point.
130 130  
131 -[[image:1654852175653-550.png]](% style="display:none" %) ** **
134 +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.
132 132  
136 +[[image:image-20220615092010-11.png]]
133 133  
134 134  
135 -== 1.5 ​ Applications ==
139 +No polish needed if the container is shine metal surface without paint or non-metal container.
136 136  
137 -* Horizontal distance measurement
138 -* Liquid level measurement
139 -* Parking management system
140 -* Object proximity and presence detection
141 -* Intelligent trash can management system
142 -* Robot obstacle avoidance
143 -* Automatic control
144 -* Sewer
145 -* Bottom water level monitoring
141 +[[image:image-20220615092044-12.png]]
146 146  
147 -== 1.6  Pin mapping and power on ==
148 148  
149 149  
150 -[[image:1654847583902-256.png]]
145 +(% style="color:blue" %)**Step3:   **(%%)Test the installation point.
151 151  
147 +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.
152 152  
153 153  
154 -= 2.  Configure LDDS75 to connect to LoRaWAN network =
150 +It is necessary to put the coupling paste between the sensor and the container, otherwise LDDS20 won’t detect the liquid level.
155 155  
152 +[[image:1655256160324-178.png]][[image:image-20220615092327-13.png]]
153 +
154 +
155 +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.
156 +
157 +
158 +(% style="color:red" %)**LED Status:**
159 +
160 +* Onboard LED: When power on device, the onboard LED will fast blink 4 times which means detect the sensor well.
161 +
162 +* (% 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.
163 +* (% style="color:blue" %)BLUE LED(% style="color:red" %) slowly blinking(%%): Sensor detects Liquid Level, The installation point is good.
164 +
165 +LDDS20 will enter into low power mode at 30 seconds after system reset or power on, Blue LED will be off after that.
166 +
167 +
168 +(% style="color:red" %)**Note 2:**
169 +
170 +(% 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.
171 +
172 +
173 +
174 +(% style="color:blue" %)**Step4:   **(%%)Install use Epoxy ab glue.
175 +
176 +Prepare Eproxy AB glue.
177 +
178 +Put Eproxy AB glue in the sensor and press it hard on the container installation point.
179 +
180 +Reset LDDS20 and see if the BLUE LED is slowly blinking.
181 +
182 +[[image:image-20220615091045-8.png||height="226" width="380"]] [[image:image-20220615091045-9.png||height="239" width="339"]]
183 +
184 +
185 +(% style="color:red" %)**Note 1:**
186 +
187 +Eproxy AB glue needs 3~~ 5 minutes to stable attached. we can use other glue material to keep it in the position.
188 +
189 +
190 +(% style="color:red" %)**Note 2:**
191 +
192 +(% 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.
193 +
194 +
195 +
196 +== 1.6 ​ Applications ==
197 +
198 +* Smart liquid control solution.
199 +* Smart liquefied gas solution.
200 +
201 +
202 +== 1.7  Precautions ==
203 +
204 +* 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.
205 +* 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.
206 +* 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.
207 +
208 +
209 +== 1.8  Pin mapping and power on ==
210 +
211 +
212 +[[image:1655257026882-201.png]]
213 +
214 +
215 +
216 += 2.  Configure LDDS20 to connect to LoRaWAN network =
217 +
218 +
156 156  == 2.1  How it works ==
157 157  
158 158  (((
159 -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
222 +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.
160 160  )))
161 161  
162 162  (((
163 -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.
226 +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.
164 164  )))
165 165  
166 166  
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172 172  )))
173 173  
174 174  (((
175 -[[image:1654848616367-242.png]]
238 +[[image:1655257698953-697.png]]
176 176  )))
177 177  
178 178  (((
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182 182  (((
183 183  
184 184  
185 -(% style="color:blue" %)**Step 1**(%%): Create a device in TTN with the OTAA keys from LDDS75.
248 +(% style="color:blue" %)**Step 1**(%%): Create a device in TTN with the OTAA keys from LDDS20.
186 186  )))
187 187  
188 188  (((
189 -Each LDDS75 is shipped with a sticker with the default device keys, user can find this sticker in the box. it looks like below.
252 +Each LDDS20 is shipped with a sticker with the default device keys, user can find this sticker in the box. it looks like below.
190 190  )))
191 191  
192 192  [[image:image-20220607170145-1.jpeg]]
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216 216  [[image:image-20220610161353-7.png]]
217 217  
218 218  
282 +
219 219  You can also choose to create the device manually.
220 220  
221 221   [[image:image-20220610161538-8.png]]
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228 228  
229 229  
230 230  
231 -(% style="color:blue" %)**Step 2**(%%): Power on LDDS75
295 +(% style="color:blue" %)**Step 2**(%%):  Power on LDDS20
232 232  
233 233  
234 234  Put a Jumper on JP2 to power on the device. ( The Switch must be in FLASH position).
235 235  
236 -[[image:image-20220610161724-10.png]]
300 +[[image:image-20220615095102-14.png]]
237 237  
238 238  
303 +
239 239  (((
240 -(% 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.
305 +(% 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.
241 241  )))
242 242  
243 243  [[image:1654849068701-275.png]]
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248 248  
249 249  (((
250 250  (((
251 -LDDS75 will uplink payload via LoRaWAN with below payload format: 
252 -)))
316 +LDDS20 will uplink payload via LoRaWAN with below payload format: 
253 253  
254 -(((
255 -Uplink payload includes in total 4 bytes.
256 -Payload for firmware version v1.1.4. . Before v1.1.3, there is on two fields: BAT and Distance
318 +Uplink payload includes in total 8 bytes.
319 +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).
257 257  )))
258 258  )))
259 259  
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280 280  === 2.3.1  Battery Info ===
281 281  
282 282  
283 -Check the battery voltage for LDDS75.
346 +Check the battery voltage for LDDS20.
284 284  
285 285  Ex1: 0x0B45 = 2885mV
286 286  
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291 291  === 2.3.2  Distance ===
292 292  
293 293  (((
294 -Get the distance. Flat object range 280mm - 7500mm.
357 +Get the distance. Flat object range 20mm - 2000mm.
295 295  )))
296 296  
297 297  (((
298 -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.**
361 +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.**
299 299  )))
300 300  
364 +* If the sensor value is 0x0000, it means system doesn't detect ultrasonic sensor.
365 +* If the sensor value lower than 0x0014 (20mm), the sensor value will be invalid.
301 301  
302 -* If the sensor value is 0x0000, it means system doesn’t detect ultrasonic sensor.
303 -* 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.
304 304  
305 305  === 2.3.3  Interrupt Pin ===
306 306  
307 -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.
370 +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.
308 308  
309 309  **Example:**
310 310  
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350 350  The payload decoder function for TTN V3 is here:
351 351  
352 352  (((
353 -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/]]
416 +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/]]
354 354  )))
355 355  
356 356  
357 357  
358 -== 2.4  Uplink Interval ==
421 +== 2.4  Downlink Payload ==
359 359  
360 -The LDDS75 by default uplink the sensor data every 20 minutes. User can change this interval by AT Command or LoRaWAN Downlink Command. See this link: [[Change Uplink Interval>>doc:Main.End Device AT Commands and Downlink Command.WebHome||anchor="H4.1ChangeUplinkInterval"]]
423 +By default, LDDS20 prints the downlink payload to console port.
361 361  
425 +[[image:image-20220615100930-15.png]]
362 362  
363 363  
428 +**Examples:**
429 +
430 +
431 +* (% style="color:blue" %)**Set TDC**
432 +
433 +If the payload=0100003C, it means set the END Node's TDC to 0x00003C=60(S), while type code is 01.
434 +
435 +Payload:    01 00 00 1E    TDC=30S
436 +
437 +Payload:    01 00 00 3C    TDC=60S
438 +
439 +
440 +* (% style="color:blue" %)**Reset**
441 +
442 +If payload = 0x04FF, it will reset the LDDS20
443 +
444 +
445 +* (% style="color:blue" %)**CFM**
446 +
447 +Downlink Payload: 05000001, Set AT+CFM=1 or 05000000 , set AT+CFM=0
448 +
449 +
450 +
364 364  == 2.5  ​Show Data in DataCake IoT Server ==
365 365  
366 366  (((
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