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23	23	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.
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26	26	It detects the distance** (% style="color:#4472c4" %) between the measured object and the sensor(%%)**, and uploads the value via wireless to LoRaWAN IoT Server.
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29	29	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.
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32	32	LDDS75 is powered by (% style="color:#4472c4" %)** 4000mA or 8500mAh Li-SOCI2 battery**(%%); It is designed for long term use up to 10 years*.
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35	35	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.
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38	38	(% style="color:#4472c4" %) * (%%)Actually lifetime depends on network coverage and uplink interval and other factors.
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43	43	[[image:1654847051249-359.png]]
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59	59	* IP66 Waterproof Enclosure
60	60	* 4000mAh or 8500mAh Battery for long term use
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62		-
63		-
64	64	== 1.3  Specification ==
65	65
66	66	=== 1.3.1  Rated environmental conditions ===
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68	68	[[image:image-20220610154839-1.png]]
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70		-**Remarks: (1) a. When the ambient temperature is 0-39 ℃, the maximum humidity is 90% (non-condensing);**
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	96	+**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)**
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72		-**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)**
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75		-
76	76	=== 1.3.2  Effective measurement range Reference beam pattern ===
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78	78	**(1) The tested object is a white cylindrical tube made of PVC, with a height of 100cm and a diameter of 7.5cm.**
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86	86	**(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.**
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89	89	[[image:1654852175653-550.png]](% style="display:none" %) ** **
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102	102	* Sewer
103	103	* Bottom water level monitoring
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105	105	== 1.6  Pin mapping and power on ==
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148	148	[[image:image-20220607170145-1.jpeg]]
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151	151	For OTAA registration, we need to set **APP EUI/ APP KEY/ DEV EUI**. Some server might no need to set APP EUI.
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153	153	Enter these keys in the LoRaWAN Server portal. Below is TTN V3 screen shot:
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155	155	**Add APP EUI in the application**
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157	157	[[image:image-20220610161353-4.png]]
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195	195	== 2.3  ​Uplink Payload ==
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198	198	LDDS75 will uplink payload via LoRaWAN with below payload format:
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200	200	Uplink payload includes in total 4 bytes.
201	201	Payload for firmware version v1.1.4. . Before v1.1.3, there is on two fields: BAT and Distance
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210	210	**Size (bytes)**
211	211	)))|=(% style="width: 62.5px;" %)**2**|=**2**|=1|=2|=**1**
212	212	|(% style="width:62.5px" %)**Value**|(% style="width:62.5px" %)[[BAT>>||anchor="H2.3.1A0BatteryInfo"]]|(((
213		-[[Distance>>||anchor="H2.3.3A0Distance"]]
	251	+[[Distance>>||anchor="H2.3.2A0Distance"]]
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215	215	(unit: mm)
216		-)))|[[Digital Interrupt (Optional)>>||anchor="H2.3.4A0Distancesignalstrength"]]|(((
217		-[[Temperature (Optional )>>||anchor="H2.3.5A0InterruptPin"]]
218		-)))|[[Sensor Flag>>path:#Sensor_Flag]]
	254	+)))|[[Digital Interrupt (Optional)>>||anchor="H2.3.3A0InterruptPin"]]|(((
	255	+[[Temperature (Optional )>>||anchor="H2.3.4A0DS18B20Temperaturesensor"]]
	256	+)))|[[Sensor Flag>>||anchor="H2.3.5A0SensorFlag"]]
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220	220	[[image:1654850511545-399.png]]
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235	235	=== 2.3.2  Distance ===
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237	237	Get the distance. Flat object range 280mm - 7500mm.
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239	239	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.**
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242	242	* If the sensor value is 0x0000, it means system doesn’t detect ultrasonic sensor.
243	243	* 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.
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245	245	=== 2.3.3  Interrupt Pin ===
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247		-This data field shows if this packet is generated by interrupt or not. [[Click here>>||anchor="H4.2A0SetInterruptMode"]] for the hardware and software set up.
	291	+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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249	249	**Example:**
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271	271	=== 2.3.5  Sensor Flag ===
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273	273	0x01: Detect Ultrasonic Sensor
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275	275	0x00: No Ultrasonic Sensor
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827	827	[[image:image-20220610172003-1.png]]
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829	829	[[image:image-20220610172003-2.png]]
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832	832	== 2.10  Battery Analysis ==
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834	834	=== 2.10.1  Battery Type ===
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839	839	The battery related documents as below:
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842		-[[ Battery Dimension>>url:http://www.dragino.com/downloads/index.php?dir=datasheet/Battery/&file=LSN50-Battery-Dimension.pdf]],
	892	+[[Battery Dimension>>url:http://www.dragino.com/downloads/index.php?dir=datasheet/Battery/&file=LSN50-Battery-Dimension.pdf]],
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845	845	[[Lithium-Thionyl Chloride Battery  datasheet>>url:https://www.dragino.com/downloads/downloads/datasheet/Battery/ER26500/ER26500_Datasheet-EN.pdf]],
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855	855	=== 2.10.2  Replace the battery ===
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858		-You can change the battery in the LDDS75.The type of battery is not limited as long as the output is between 3v to 3.6v. On the main board, there is a diode (D1) between the battery and the main circuit. If you need to use a battery with less than 3.3v, please remove the D1 and shortcut the two pads of it so there won’t be voltage drop between battery and main board.
	908	+You can change the battery in the LDDS75.The type of battery is not limited as long as the output is between 3v to 3.6v. On the main board, there is a diode (D1) between the battery and the main circuit. If you need to use a battery with less than 3.3v, please remove the D1 and shortcut the two pads of it so there won't be voltage drop between battery and main board.
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866		-The default battery pack of LDDS75 includes a ER18505 plus super capacitor. If user can’t find this pack locally, they can find ER18505 or equivalence, which will also work in most case. The SPC can enlarge the battery life for high frequency use (update period below 5 minutes)
	916	+The default battery pack of LDDS75 includes a ER18505 plus super capacitor. If user can't find this pack locally, they can find ER18505 or equivalence, which will also work in most case. The SPC can enlarge the battery life for high frequency use (update period below 5 minutes)
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871		-= 3.  Configure LLDS12 via AT Command or LoRaWAN Downlink =
	921	+= 3.  Configure LDDS75 via AT Command or LoRaWAN Downlink =
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881		-AT Command Connection: See [[FAQ>>||anchor="H7.A0FAQ"]].
	931	+AT Command Connection: See [[FAQ>>||anchor="H4.A0FAQ"]].
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