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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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86	86	* IP66 Waterproof Enclosure
87	87	* 4000mAh or 8500mAh Battery for long term use
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90	90	== 1.3  Specification ==
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92	92	=== 1.3.1  Rated environmental conditions ===
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94	94	[[image:image-20220610154839-1.png]]
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97		-**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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102	102	=== 1.3.2  Effective measurement range Reference beam pattern ===
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104	104	**(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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113	113	**(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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117	117	[[image:1654852175653-550.png]](% style="display:none" %) ** **
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130	130	* Sewer
131	131	* Bottom water level monitoring
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135	135	== 1.6  Pin mapping and power on ==
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178	178	[[image:image-20220607170145-1.jpeg]]
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182	182	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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186	186	Enter these keys in the LoRaWAN Server portal. Below is TTN V3 screen shot:
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190	190	**Add APP EUI in the application**
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193	193	[[image:image-20220610161353-4.png]]
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231	231	== 2.3  ​Uplink Payload ==
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235	235	LDDS75 will uplink payload via LoRaWAN with below payload format:
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239	239	Uplink payload includes in total 4 bytes.
240	240	Payload for firmware version v1.1.4. . Before v1.1.3, there is on two fields: BAT and Distance
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275	275	=== 2.3.2  Distance ===
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278	278	Get the distance. Flat object range 280mm - 7500mm.
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282	282	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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286	286	* If the sensor value is 0x0000, it means system doesn’t detect ultrasonic sensor.
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287	287	* 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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292	292	=== 2.3.3  Interrupt Pin ===
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294	294	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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858	858	* Solid ON for 5 seconds once device successful Join the network.
859	859	* Blink once when device transmit a packet.
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861	861	== 2.8  ​Firmware Change Log ==
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