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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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73		-
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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147	147	[[image:image-20220607170145-1.jpeg]]
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150	150	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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152	152	Enter these keys in the LoRaWAN Server portal. Below is TTN V3 screen shot:
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154	154	**Add APP EUI in the application**
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156	156	[[image:image-20220610161353-4.png]]
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194	194	== 2.3  ​Uplink Payload ==
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197	197	LDDS75 will uplink payload via LoRaWAN with below payload format:
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199	199	Uplink payload includes in total 4 bytes.
200	200	Payload for firmware version v1.1.4. . Before v1.1.3, there is on two fields: BAT and Distance
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234	234	=== 2.3.2  Distance ===
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236	236	Get the distance. Flat object range 280mm - 7500mm.
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238	238	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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241	241	* If the sensor value is 0x0000, it means system doesn’t detect ultrasonic sensor.
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272	272	=== 2.3.5  Sensor Flag ===
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274	274	0x01: Detect Ultrasonic Sensor
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276	276	0x00: No Ultrasonic Sensor
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287	287	The payload decoder function for TTN V3 is here:
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289	289	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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817	817	== 2.8  ​Firmware Change Log ==
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1016	1016	* Example 1: Downlink Payload: 06000000 ~/~/ Turn off interrupt mode
1017	1017	* Example 2: Downlink Payload: 06000003 ~/~/ Set the interrupt mode to rising edge trigger
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1022	1022	= 4.  FAQ =
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1024	1024	== 4.1  What is the frequency plan for LDDS75? ==