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14	14	**Table of Contents:**
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24	24	= 1.  Introduction =
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26		-== 1.1 ​ What is LoRaWAN Soil Moisture & EC Sensor ==
	23	+== 1.1 ​ What is NDDS75 Distance Detection Sensor ==
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32		-Dragino NSE01 is an (% style="color:blue" %)**NB-IOT soil moisture & EC sensor**(%%) for agricultural IoT. Used to measure the soil moisture of saline-alkali soil and loam. The soil sensor uses the FDR method to calculate soil moisture and compensates it with soil temperature and electrical conductivity. It has also been calibrated for mineral soil types at the factory.
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	28	+The Dragino NDDS75 is a **NB-IOT 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 **ultrasonic sensing technology** for **distance measurement**, and temperature compensation is performed internally to improve the reliability of data. The NDDS75 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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36		-It can detect (% style="color:blue" %)**Soil Moisture, Soil Temperature and Soil Conductivity**(%%), and upload its value to the server wirelessly.
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	30	+It detects the distance between the measured object and the sensor, and uploads the value via wireless to IoT Server.
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40		-The wireless technology used in NSE01 allows the device to send data at a low data rate and reach ultra-long distances, providing ultra-long-distance spread spectrum Communication.
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	32	+**NarrowBand-Internet of Things (NB-IoT)** is a standards-based low power wide area (LPWA) technology developed to enable a wide range of new IoT devices and services. NB-IoT significantly improves the power consumption of user devices, system capacity and spectrum efficiency, especially in deep coverage.
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	34	+NDDS75 is powered by 8**500mA Li-SOCI2 battery**; It is designed for long term use up to 5 years*.
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	36	+~* Actually lifetime depends on network coverage and uplink interval and other factors
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44		-NSE01 are powered by (% style="color:blue" %)**8500mAh Li-SOCI2**(%%) batteries, which can be used for up to 5 years.
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75	75	== 1.3  Specification ==
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341	341	== 2.4  Payload Explanation and Sensor Interface ==
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