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24	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.
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32	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.
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40	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.
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48	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*.
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56	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.
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64	64	(% style="color:#4472c4" %) * (%%)Actually lifetime depends on network coverage and uplink interval and other factors.
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70	70	[[image:1654847051249-359.png]]
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93	93	[[image:image-20220610154839-1.png]]
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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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	68	+**Remarks: (1) a. When the ambient temperature is 0-39 ℃, the maximum humidity is 90% (non-condensing);**
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	70	+**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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101	101	=== 1.3.2  Effective measurement range Reference beam pattern ===
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103	103	**(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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112	112	**(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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116	116	[[image:1654852175653-550.png]](% style="display:none" %) ** **
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176	176	[[image:image-20220607170145-1.jpeg]]
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180	180	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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184	184	Enter these keys in the LoRaWAN Server portal. Below is TTN V3 screen shot:
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188	188	**Add APP EUI in the application**
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191	191	[[image:image-20220610161353-4.png]]
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229	229	== 2.3  ​Uplink Payload ==
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233	233	LDDS75 will uplink payload via LoRaWAN with below payload format:
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237	237	Uplink payload includes in total 4 bytes.
238	238	Payload for firmware version v1.1.4. . Before v1.1.3, there is on two fields: BAT and Distance
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273	273	=== 2.3.2  Distance ===
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276	276	Get the distance. Flat object range 280mm - 7500mm.
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280	280	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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284	284	* If the sensor value is 0x0000, it means system doesn’t detect ultrasonic sensor.
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315	315	=== 2.3.5  Sensor Flag ===
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318	318	0x01: Detect Ultrasonic Sensor
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322	322	0x00: No Ultrasonic Sensor
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334	334	The payload decoder function for TTN V3 is here:
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337	337	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/]]
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861	861	* Solid ON for 5 seconds once device successful Join the network.
862	862	* Blink once when device transmit a packet.
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864	864	== 2.8  ​Firmware Change Log ==
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907	907	=== 2.10.2  Replace the battery ===
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910		-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.
	863	+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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918		-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)
	871	+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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933		-AT Command Connection: See [[FAQ>>||anchor="H4.A0FAQ"]].
	886	+AT Command Connection: See [[FAQ>>||anchor="H7.A0FAQ"]].
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