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Last modified by Mengting Qiu on 2025/08/06 17:02
From version 157.1
edited by Xiaoling
on 2022/06/15 09:09
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To version 172.8
edited by Xiaoling
on 2022/06/15 10:04
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101 101  * 8500mAh Battery for long term use
102 102  
103 103  
104 +== 1.3  Suitable Container & Liquid ==
104 104  
105 -== 1.3  Specification ==
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.
106 106  
107 -=== 1.3.1  Rated environmental conditions ===
108 108  
109 -[[image:image-20220610154839-1.png]]
114 +== 1.4  Mechanical ==
110 110  
111 -(((
112 -**Remarks: (1) a. When the ambient temperature is 0-39 ℃, the maximum humidity is 90% (non-condensing);       **
116 +[[image:image-20220615090910-1.png]]
113 113  
114 -**~ 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)**
115 -)))
116 116  
119 +[[image:image-20220615090910-2.png]]
117 117  
118 118  
119 -=== 1.3.2  Effective measurement range Reference beam pattern ===
120 120  
121 -**(1) The tested object is a white cylindrical tube made of PVC, with a height of 100cm and a diameter of 7.5cm.**
123 +== 1.5  Install LDDS20 ==
122 122  
123 123  
126 +(% style="color:blue" %)**Step 1**(%%):  Choose the installation point.
124 124  
125 -[[image:1654852253176-749.png]]
128 +LDDS20 (% style="color:red" %)**MUST**(%%) be installed on the container bottom middle position.
126 126  
130 +[[image:image-20220615091045-3.png]]
127 127  
128 128  
129 -(((
130 -**(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.**
131 -)))
132 132  
134 +(% style="color:blue" %)**Step 2**(%%):  Polish the installation point.
133 133  
134 -[[image:1654852175653-550.png]](% style="display:none" %) ** **
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.
135 135  
138 +[[image:image-20220615092010-11.png]]
136 136  
137 137  
138 -== 1.5 ​ Applications ==
141 +No polish needed if the container is shine metal surface without paint or non-metal container.
139 139  
140 -* Horizontal distance measurement
141 -* Liquid level measurement
142 -* Parking management system
143 -* Object proximity and presence detection
144 -* Intelligent trash can management system
145 -* Robot obstacle avoidance
146 -* Automatic control
147 -* Sewer
148 -* Bottom water level monitoring
143 +[[image:image-20220615092044-12.png]]
149 149  
150 -== 1.6  Pin mapping and power on ==
151 151  
152 152  
153 -[[image:1654847583902-256.png]]
147 +(% style="color:blue" %)**Step3:   **(%%)Test the installation point.
154 154  
149 +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.
155 155  
156 156  
157 -= 2.  Configure LDDS75 to connect to LoRaWAN network =
152 +It is necessary to put the coupling paste between the sensor and the container, otherwise LDDS20 won’t detect the liquid level.
158 158  
154 +[[image:1655256160324-178.png]][[image:image-20220615092327-13.png]]
155 +
156 +
157 +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.
158 +
159 +
160 +(% style="color:red" %)**LED Status:**
161 +
162 +* Onboard LED: When power on device, the onboard LED will fast blink 4 times which means detect the sensor well.
163 +
164 +* (% 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.
165 +* (% style="color:blue" %)BLUE LED(% style="color:red" %) slowly blinking(%%): Sensor detects Liquid Level, The installation point is good.
166 +
167 +LDDS20 will enter into low power mode at 30 seconds after system reset or power on, Blue LED will be off after that.
168 +
169 +
170 +(% style="color:red" %)**Note 2:**
171 +
172 +(% 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.
173 +
174 +
175 +
176 +(% style="color:blue" %)**Step4:   **(%%)Install use Epoxy ab glue.
177 +
178 +Prepare Eproxy AB glue.
179 +
180 +Put Eproxy AB glue in the sensor and press it hard on the container installation point.
181 +
182 +Reset LDDS20 and see if the BLUE LED is slowly blinking.
183 +
184 +[[image:image-20220615091045-8.png||height="226" width="380"]] [[image:image-20220615091045-9.png||height="239" width="339"]]
185 +
186 +
187 +(% style="color:red" %)**Note 1:**
188 +
189 +Eproxy AB glue needs 3~~ 5 minutes to stable attached. we can use other glue material to keep it in the position.
190 +
191 +
192 +(% style="color:red" %)**Note 2:**
193 +
194 +(% 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.
195 +
196 +
197 +
198 +== 1.6 ​ Applications ==
199 +
200 +* Smart liquid control solution.
201 +* Smart liquefied gas solution.
202 +
203 +
204 +
205 +== 1.7  Precautions ==
206 +
207 +* 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.
208 +* 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.
209 +* 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.
210 +
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 +
159 159  == 2.1  How it works ==
160 160  
161 161  (((
162 -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
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 LDDS20. If there is coverage of the LoRaWAN network, it will automatically join the network via OTAA and start to send the sensor value.
163 163  )))
164 164  
165 165  (((
166 -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.
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.
167 167  )))
168 168  
169 169  
... ... @@ -175,7 +175,7 @@
175 175  )))
176 176  
177 177  (((
178 -[[image:1654848616367-242.png]]
242 +[[image:1655257698953-697.png]]
179 179  )))
180 180  
181 181  (((
... ... @@ -185,11 +185,11 @@
185 185  (((
186 186  
187 187  
188 -(% style="color:blue" %)**Step 1**(%%): Create a device in TTN with the OTAA keys from LDDS75.
252 +(% style="color:blue" %)**Step 1**(%%): Create a device in TTN with the OTAA keys from LDDS20.
189 189  )))
190 190  
191 191  (((
192 -Each LDDS75 is shipped with a sticker with the default device keys, user can find this sticker in the box. it looks like below.
256 +Each LDDS20 is shipped with a sticker with the default device keys, user can find this sticker in the box. it looks like below.
193 193  )))
194 194  
195 195  [[image:image-20220607170145-1.jpeg]]
... ... @@ -219,6 +219,7 @@
219 219  [[image:image-20220610161353-7.png]]
220 220  
221 221  
286 +
222 222  You can also choose to create the device manually.
223 223  
224 224   [[image:image-20220610161538-8.png]]
... ... @@ -231,16 +231,17 @@
231 231  
232 232  
233 233  
234 -(% style="color:blue" %)**Step 2**(%%): Power on LDDS75
299 +(% style="color:blue" %)**Step 2**(%%):  Power on LDDS20
235 235  
236 236  
237 237  Put a Jumper on JP2 to power on the device. ( The Switch must be in FLASH position).
238 238  
239 -[[image:image-20220610161724-10.png]]
304 +[[image:image-20220615095102-14.png]]
240 240  
241 241  
307 +
242 242  (((
243 -(% 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.
309 +(% 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.
244 244  )))
245 245  
246 246  [[image:1654849068701-275.png]]
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251 251  
252 252  (((
253 253  (((
254 -LDDS75 will uplink payload via LoRaWAN with below payload format: 
255 -)))
320 +LDDS20 will uplink payload via LoRaWAN with below payload format: 
256 256  
257 -(((
258 -Uplink payload includes in total 4 bytes.
259 -Payload for firmware version v1.1.4. . Before v1.1.3, there is on two fields: BAT and Distance
322 +Uplink payload includes in total 8 bytes.
323 +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).
260 260  )))
261 261  )))
262 262  
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283 283  === 2.3.1  Battery Info ===
284 284  
285 285  
286 -Check the battery voltage for LDDS75.
350 +Check the battery voltage for LDDS20.
287 287  
288 288  Ex1: 0x0B45 = 2885mV
289 289  
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294 294  === 2.3.2  Distance ===
295 295  
296 296  (((
297 -Get the distance. Flat object range 280mm - 7500mm.
361 +Get the distance. Flat object range 20mm - 2000mm.
298 298  )))
299 299  
300 300  (((
301 -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.**
365 +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.**
302 302  )))
303 303  
368 +* If the sensor value is 0x0000, it means system doesn't detect ultrasonic sensor.
369 +* If the sensor value lower than 0x0014 (20mm), the sensor value will be invalid.
304 304  
305 -* If the sensor value is 0x0000, it means system doesn’t detect ultrasonic sensor.
306 -* 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.
307 307  
372 +
308 308  === 2.3.3  Interrupt Pin ===
309 309  
310 -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.
375 +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.
311 311  
312 312  **Example:**
313 313  
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353 353  The payload decoder function for TTN V3 is here:
354 354  
355 355  (((
356 -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/]]
421 +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/]]
357 357  )))
358 358  
359 359  
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