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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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66	66	[[image:image-20220610154839-1.png]]
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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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	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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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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74	74	=== 1.3.2  Effective measurement range Reference beam pattern ===
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76	76	**(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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84	84	**(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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87	87	[[image:1654852175653-550.png]](% style="display:none" %) ** **
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100	100	* Sewer
101	101	* Bottom water level monitoring
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103	103	== 1.6  Pin mapping and power on ==
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146	146	[[image:image-20220607170145-1.jpeg]]
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149	149	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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151	151	Enter these keys in the LoRaWAN Server portal. Below is TTN V3 screen shot:
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153	153	**Add APP EUI in the application**
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155	155	[[image:image-20220610161353-4.png]]
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193	193	== 2.3  ​Uplink Payload ==
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196	196	LDDS75 will uplink payload via LoRaWAN with below payload format:
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198	198	Uplink payload includes in total 4 bytes.
199	199	Payload for firmware version v1.1.4. . Before v1.1.3, there is on two fields: BAT and Distance
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233	233	=== 2.3.2  Distance ===
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235	235	Get the distance. Flat object range 280mm - 7500mm.
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237	237	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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240	240	* If the sensor value is 0x0000, it means system doesn’t detect ultrasonic sensor.
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241	241	* 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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244	244	=== 2.3.3  Interrupt Pin ===
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246	246	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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270	270	=== 2.3.5  Sensor Flag ===
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272	272	0x01: Detect Ultrasonic Sensor
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274	274	0x00: No Ultrasonic Sensor
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285	285	The payload decoder function for TTN V3 is here:
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287	287	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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810	810	* Solid ON for 5 seconds once device successful Join the network.
811	811	* Blink once when device transmit a packet.
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813		-
814	814	== 2.8  ​Firmware Change Log ==
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