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Last modified by Xiaoling on 2025/04/27 16:45
From version 170.4
edited by Xiaoling
on 2022/06/15 09:40
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To version 155.2
edited by Xiaoling
on 2022/06/15 09:06
Change comment: There is no comment for this version

Summary

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101 101  * 8500mAh Battery for long term use
102 102  
103 103  
104 -== 1.3  Suitable Container & Liquid ==
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.
105 +== 1.3  Specification ==
112 112  
107 +=== 1.3.1  Rated environmental conditions ===
113 113  
114 -== 1.4  Mechanical ==
109 +[[image:image-20220610154839-1.png]]
115 115  
116 -[[image:image-20220615090910-1.png]]
111 +(((
112 +**Remarks: (1) a. When the ambient temperature is 0-39 ℃, the maximum humidity is 90% (non-condensing);       **
117 117  
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 +)))
118 118  
119 -[[image:image-20220615090910-2.png]]
120 120  
121 121  
119 +=== 1.3.2  Effective measurement range Reference beam pattern ===
122 122  
123 -== 1.5  Install LDDS20 ==
121 +**(1) The tested object is a white cylindrical tube made of PVC, with a height of 100cm and a diameter of 7.5cm.**
124 124  
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.
125 +[[image:1654852253176-749.png]]
129 129  
130 -[[image:image-20220615091045-3.png]]
131 131  
132 132  
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 +)))
133 133  
134 -(% style="color:blue" %)**Step 2**(%%):  Polish the installation point.
135 135  
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.
134 +[[image:1654852175653-550.png]](% style="display:none" %) ** **
137 137  
138 -[[image:image-20220615092010-11.png]]
139 139  
140 140  
141 -No polish needed if the container is shine metal surface without paint or non-metal container.
138 +== 1.5 ​ Applications ==
142 142  
143 -[[image:image-20220615092044-12.png]]
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
144 144  
150 +== 1.6  Pin mapping and power on ==
145 145  
146 -(% style="color:blue" %)**Step3:   **(%%)Test the installation point.
147 147  
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.
153 +[[image:1654847583902-256.png]]
149 149  
150 150  
151 -It is necessary to put the coupling paste between the sensor and the container, otherwise LDDS20 won’t detect the liquid level.
152 152  
153 -[[image:1655256160324-178.png]][[image:image-20220615092327-13.png]]
157 += 2.  Configure LDDS75 to connect to LoRaWAN network =
154 154  
155 -
156 -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.
157 -
158 -
159 -(% style="color:red" %)**LED Status:**
160 -
161 -* Onboard LED: When power on device, the onboard LED will fast blink 4 times which means detect the sensor well.
162 -
163 -* (% 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.
164 -* (% style="color:blue" %)BLUE LED(% style="color:red" %) slowly blinking(%%): Sensor detects Liquid Level, The installation point is good.
165 -
166 -LDDS20 will enter into low power mode at 30 seconds after system reset or power on, Blue LED will be off after that.
167 -
168 -
169 -(% style="color:red" %)**Note 2:**
170 -
171 -(% 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.
172 -
173 -
174 -(% style="color:blue" %)**Step4:   **(%%)Install use Epoxy ab glue.
175 -
176 -
177 -Prepare Eproxy AB glue.
178 -
179 -Put Eproxy AB glue in the sensor and press it hard on the container installation point.
180 -
181 -Reset LDDS20 and see if the BLUE LED is slowly blinking.
182 -
183 -[[image:image-20220615091045-8.png||height="226" width="380"]] [[image:image-20220615091045-9.png||height="239" width="339"]]
184 -
185 -
186 -(% style="color:red" %)**Note 1:**
187 -
188 -Eproxy AB glue needs 3~~ 5 minutes to stable attached. we can use other glue material to keep it in the position.
189 -
190 -
191 -(% style="color:red" %)**Note 2:**
192 -
193 -(% 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.
194 -
195 -
196 -
197 -== 1.6 ​ Applications ==
198 -
199 -* Smart liquid control solution.
200 -* Smart liquefied gas solution.
201 -
202 -
203 -
204 -== 1.7  Precautions ==
205 -
206 -* 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.
207 -* 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.
208 -* 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.
209 -
210 -
211 -
212 -== 1.8  Pin mapping and power on ==
213 -
214 -
215 -[[image:1655257026882-201.png]]
216 -
217 -
218 -
219 -= 2.  Configure LDDS20 to connect to LoRaWAN network =
220 -
221 -
222 222  == 2.1  How it works ==
223 223  
224 224  (((
225 -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.
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
226 226  )))
227 227  
228 228  (((
229 -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.
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.
230 230  )))
231 231  
232 232  
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