CN111163177B - Integrally designed soil moisture content Internet of things monitoring system - Google Patents
Integrally designed soil moisture content Internet of things monitoring system Download PDFInfo
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- CN111163177B CN111163177B CN202010025632.9A CN202010025632A CN111163177B CN 111163177 B CN111163177 B CN 111163177B CN 202010025632 A CN202010025632 A CN 202010025632A CN 111163177 B CN111163177 B CN 111163177B
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Abstract
The invention discloses an integrally designed soil moisture content Internet of things monitoring system, which comprises a soil moisture sensor, a central control unit of the monitoring system, a data receiving and terminal display two-dimensional code, wherein the data receiving and terminal display two-dimensional code is used for receiving data; the structure comprises an upper tube machine box, a middle tube machine box and a lower tube machine box. With the integrated design such as analog sensor, the data acquisition appearance, wireless transmitting circuit, solar energy power supply and equipment two-dimensional code, make the sensor need not complicated system integration when field application in the field, the equipment, processes such as debugging and network deployment test, loose ground realizes plug-and-play gently, it is low to have solved traditional soil moisture content sensor system integration degree, the equipment is complicated, the consumption is big, the signal is weak, the poor problem of stability, provide accurate reliable data source for wisdom agricultural thing networking, at water-saving irrigation, the integration of liquid manure, soil moisture content automatic monitoring field has wide application prospect.
Description
Technical Field
The invention relates to the technical field of Internet of things, in particular to an integrally designed soil moisture content Internet of things monitoring system.
Background
The accurate acquisition of soil moisture information has important significance in the fields of water-saving irrigation, water and fertilizer integration, automatic control of greenhouses, flood prevention and drought resistance, forestry, weather and the like. With the development of intelligent agriculture, agricultural internet of things and big data, the demand of soil moisture measurement is more and more, and the application development of a new soil moisture real-time monitoring technology is promoted.
The existing equipment in the current market has more problems in the technology: firstly, the field monitoring precision is not high; secondly, the stability is poor, the working point of the detection circuit can deviate at intervals to cause error increase, and the sensor needs to be calibrated again; the integration level of the soil moisture content sensor in the first generation of China is not high, many soil moisture content monitoring devices in the current market are not sensors specially designed for the Internet of things, other devices are required to be integrated when the soil moisture content monitoring devices are connected into the Internet of things, the complexity and power consumption of the system are increased, the difficulty of installation and debugging is increased, the problems of old technology, non-uniform interfaces, incompatibility and complex system integration are solved, and the soil moisture content monitoring device is very inconvenient for agricultural production and field automatic monitoring.
At present, the mainstream technology mainly adopts a contact pin type sensor (as shown in figure 2), the sensor has poor stability and repeatability, the sensor needs to be connected with a digital acquisition device through an RS485/RS232 interface by a long cable, and the defects of high power consumption, serious signal attenuation and unstable performance exist. The sensor generally can only realize the acquisition of analog signals, a digital acquisition instrument is required to be configured for data acquisition and communication, and if measured data is stored in a PC (personal computer), an upper computer is also required to be connected with the data acquisition instrument. Due to the constraint of a connecting cable, the application is limited and the equipment is complex, and a needle type sensor and a digital receiving set of a plurality of independent RS485/RS232 interfaces are required for a soil moisture monitoring system with multiple depths to form a complex system. Multiple independent sensor sets also have poor consistency in device output. In addition, the huge system also brings complex construction and installation and high installation cost of the field monitoring station. If the access to the internet of things needs to be additionally provided with internet of things equipment, even the difficulty is often increased for networking because the interfaces and the protocols are not uniform.
Traditional soil moisture content sensor generally indicates simulation perception and simulation detection circuitry to do not include data acquisition instrument and wireless transmission part and data display terminal, need external data acquisition instrument and network transmission equipment again during practical application, lead to whole consumption big, need external large-scale solar panel to guarantee power supply, can't realize the integrated design, increased the degree of difficulty of installation with the debugging, introduced very inconveniently. According to the invention, a large system (comprising a plurality of sensors, data acquisition, wireless transmission, an upper computer and the like) formed by traditional discrete equipment is integrated into a 'one pipe' (as shown in figure 3) in a highly miniaturized manner, and the integrated design of a simulation sensor, a data acquisition instrument, a wireless transmission circuit, solar power supply, equipment two-dimensional codes and the like is realized, so that the sensors do not need complicated system integration, assembly, debugging, networking test and other processes when applied in the field, and plug and play can be easily realized.
Disclosure of Invention
The invention aims to solve the problems of low integration level, complex equipment, high system power consumption, poor reliability, complex installation and the like of the existing soil moisture content sensor of the Internet of things in the domestic market. Therefore, the technical scheme of the invention is realized as follows:
the invention provides an integrally designed soil moisture content Internet of things monitoring system, which comprises: the soil moisture sensor, the central control unit of the monitoring system, the data receiving and terminal display two-dimensional codes;
soil moisture content thing networking monitoring system's structure divide into the triplex: the pipe feeding machine box, the middle pipe machine box and the pipe discharging machine box are arranged in the middle pipe machine box; the central control unit of fixed monitoring system in the top tube machine box slot, central control unit includes: the solar photovoltaic panel is mounted on the upper surface of the machine box, a small hole is formed in the upper surface of the machine box, a power line of the solar photovoltaic panel is connected with the charging and power management circuit through the small hole, and the small hole is blocked by waterproof glue; a soil moisture sensor is fixed in the middle pipe machine box; a rechargeable lithium battery is fixed in the tube discharging machine box; the data line and the power line are respectively connected with the soil moisture sensor in the middle pipe and the rechargeable lithium battery power line in the lower pipe, and the pipe feeding machine box, the middle pipe machine box and the lower pipe machine box are in screwed connection by threaded openings with waterproof sealing rings;
the soil moisture sensor is a multi-depth soil moisture sensor, is used for sensing soil moisture data and processing signals, and comprises a plurality of sensing probes, a soil moisture simulation detection circuit and a single chip microcomputer; the sensing probe is used as a reactance element of the analog detection circuit and is connected into the analog detection circuit, the soil moisture detected by the sensing probe is calculated through the output voltage of the analog detection circuit, the output voltage is directly input into the singlechip, and the singlechip performs storage, digital amplification and A/D conversion;
the central control unit of the monitoring system is used for storing the data of the soil moisture sensor and wirelessly transmitting the data, wherein the data acquisition and wireless transmission circuit comprises a microprocessor main control circuit MCU, an NB-IoT wireless communication module, an NB-IoT module, a radio frequency antenna and an SIM card;
the solar photovoltaic panel, the charging and power management circuit and the rechargeable lithium battery form a solar power supply module which is used for supplying power to the soil moisture content Internet of things monitoring system, and the charging and power management circuit is connected with the solar photovoltaic panel through a wire to charge the rechargeable lithium battery; the solar power supply module is respectively connected with the soil moisture sensor and a central control unit of the monitoring system;
the data receiving and terminal display two-dimensional codes, data sent by the system are stored in a cloud database, the link address of a user data receiving and terminal display page serves as a prefix and a communication module ID number, a two-dimensional code which can be identified by WeChat is generated through two-dimensional code generation software, the two-dimensional code is printed and pasted on the surface of the soil moisture content Internet of things monitoring system box, and the user scans the code and collects the data to enter a data display page through the WeChat to check up-to-date data at any time.
Preferably, the main control circuit MCU is a control center of the soil moisture content Internet of things monitoring system, the MCU data acquisition channel 1 is connected with the soil moisture sensor circuit, the MCU data acquisition channel 2 is connected with the environmental parameter sensor, the MCU data acquisition channel 3 is connected with the NB-IoT wireless communication module, and data are transmitted to a memory of a cloud server through a radio frequency antenna of the NB-IoT wireless communication module;
preferably, the environment parameter sensor comprises an air temperature sensor, an air humidity sensor and an atmospheric pressure sensor, and the environment parameter sensor senses, acquires and processes environment parameters, stores the environment parameters in the main control circuit MCU, and packs and sends the environment parameters with soil moisture data;
preferably, the rechargeable lithium batteries are 2-3 rechargeable lithium batteries with the capacity of 2000mAh, the rechargeable lithium batteries are connected in parallel to form a rechargeable lithium battery with the capacity of 4000-6000 mAh, the power supply voltage range is 3.6-4.2V, and the charging current is 300 mA; the charging management circuit controls the charging process: the battery is protected from over-discharge, over-voltage, over-charge and over-temperature, so that the service life of the battery and the safety of a user can be effectively protected;
preferably, the main control circuit MCU is responsible for data acquisition, data processing and transmission control, and the main controller has the following working procedures:
(1) initializing a perception module: controlling initialization and data acquisition of a soil moisture sensor and an environmental parameter sensor;
(2) receiving data: receiving data of a soil moisture sensor and an environmental parameter sensor;
(3) starting the NB-IoT wireless communication module to search a communication network;
(4) data processing: control data transmission to the NB-IoT wireless communication module for data processing;
(5) data transmission: controlling the NB-IoT wireless communication module to transmit data to a cloud server;
according to the technical scheme provided by the invention, the integrally designed soil moisture content Internet of things monitoring system is provided, and the simulation sensor, the data acquisition instrument, the wireless transmission circuit, the solar power supply, the equipment two-dimensional code and the like are integrally designed, so that the sensor does not need complicated system integration, assembly, debugging, networking test and other processes when applied in the field, is gently loose and can be used in a plug-and-play manner, the problems of low integration level, complicated equipment, high power consumption, weak signals and poor stability of the traditional soil moisture content sensor system are solved, an accurate and reliable data source is provided for the intelligent agricultural Internet of things, and the integrally designed soil moisture content Internet of things monitoring system has a wide application prospect in the fields of water-saving irrigation, water and fertilizer integration and automatic soil moisture content monitoring.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a functional block diagram of an integrally designed soil moisture content internet of things monitoring system according to embodiment 1 of the present invention;
fig. 2 is a comparison diagram of a discrete multi-device integrated large system and an integrally designed soil moisture content internet-of-things monitoring system provided in embodiment 1 of the present invention;
FIG. 3 is a schematic diagram of a main controller and peripheral circuits of the STM32F072CBT6 microprocessor provided in embodiment 1 of the present invention;
fig. 4(a) is an external view of an L651 wireless communication module provided in embodiment 1 of the present invention, and (b) is a size information diagram of the L651 module provided in embodiment 1 of the present invention;
fig. 5 is a schematic diagram of an L651 wireless communication circuit provided in embodiment 1 of the present invention;
fig. 6(a) is a schematic diagram of a dual-channel SIM card multiplexing analog switch circuit provided in embodiment 1 of the present invention, and (b) is a schematic diagram of a dual-SIM card interface and peripheral circuits provided in embodiment 1 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or quantity or location.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
Example 1:
as shown in fig. 1, the integrally designed soil moisture content internet of things monitoring system provided by the embodiment includes a soil moisture sensor, a central control unit of the monitoring system, and a two-dimensional code for data receiving and terminal display;
soil moisture content thing networking monitoring system's structure divide into the triplex: the pipe feeding machine box, the middle pipe machine box and the pipe discharging machine box are arranged in the middle pipe machine box; the central control unit of fixed monitoring system in the top tube machine box slot, central control unit includes: the solar tube installing machine comprises a solar photovoltaic panel, a charging and power management circuit, a data acquisition and wireless transmission circuit, an environmental parameter sensor and a GPS positioning chip, wherein the solar photovoltaic panel is installed on the upper surface of a tube installing machine box; a soil moisture sensor is fixed in the middle pipe machine box; a rechargeable lithium battery is fixed in the tube discharging machine box; the data line and the power line are respectively connected with the soil moisture sensor in the middle pipe and the rechargeable lithium battery power line in the lower pipe, and the pipe feeding machine box, the middle pipe machine box and the lower pipe machine box are in screwed connection by threaded openings with waterproof sealing rings;
the soil moisture sensor is a multi-depth soil moisture sensor, is used for sensing soil moisture data and processing signals, and comprises a plurality of sensing probes, a soil moisture simulation detection circuit and a single chip microcomputer; the sensing probe is used as a reactance element of the analog detection circuit and is connected into the analog detection circuit, the soil moisture detected by the sensing probe is calculated through the output voltage of the analog detection circuit, the output voltage is directly input into the singlechip, and the singlechip performs storage, digital amplification and A/D conversion;
the central control unit of the monitoring system is used for storing the data of the soil moisture sensor and wirelessly transmitting the data, wherein the data acquisition and wireless transmission circuit comprises a main control circuit MCU, an NB-IoT wireless communication module, an NB-IoT module, a radio frequency antenna and an SIM card;
the solar photovoltaic panel, the charging and power management circuit and the rechargeable lithium battery form a solar power supply module which is used for supplying power to the soil moisture content Internet of things monitoring system, and the charging and power management circuit is connected with the solar photovoltaic panel through a wire to charge the rechargeable lithium battery; the solar power supply module is respectively connected with the soil moisture sensor and a central control unit of the monitoring system;
specifically, the MCU main control circuit adopts an ARM series STM32F072CBT6 type chip and 48-pin patch packaging, integrates a high-performance ARM Cortex-M032 bit RISC (Reduced Instruction Set Computing) core, has the working frequency of 48MHz, can work within the temperature range of-40 to +85 ℃, and has the power supply range of 2.0 to 3.6V. The lowest energy consumption of the equipment is realized by supporting three low-power consumption modes of sleeping, stopping and standby; the sleep current is only 1-2 uA, and the low-power-consumption design concept of the embodiment is met.
Specifically, as shown in FIG. 3, a schematic diagram of a main controller STM32F072CBT6 (MCU) and peripheral circuits is shown. The MCU is powered by 3.3V external power supply and is connected with a 32.768kHz external passive crystal oscillator through pins 3 and 4 of the MCU for waking up the MCU for timing; the MCU is provided with an independent watchdog circuit, adopts an internal low-speed (37kHz) clock source and is used for monitoring the running state of the internal program of the module and preventing the program from running away; when the system works normally, the MCU outputs a pulse to the watchdog every 28s, and if the program fails to operate and the watchdog circuit cannot feed the watchdog on time, the watchdog circuit automatically resets the program. The main working frequency of the MCU is 2MHz, and the working current is 200 uA;
the work flow of the master controller is as follows:
(1) initializing a perception module: a SENSOR _ EN (pin 42) of the MCU controls a power supply switch of a sensor sensing module to supply power to the sensing module, and the sensing module acquires data;
(2) data reception: pins 2 and3 of an N76E003AT20 singlechip of the soil moisture sensor are connected through pins 13 and 12 of the MCU to receive the collected data of the soil moisture sensor;
(3) starting the NB-IoT wireless communication module: the NB _ EN (pin 46) of the MCU gives a high level, controls the NB-IoT module to enable power on, and starts NB-IoT work through the NB _ PWR (pin 16) of the MCU at a low level of 1 s;
(4) data transmission: transmitting the data to an NB-IoT wireless communication module through pins 10 and 11 of the MCU for further data processing and wireless transmission;
(5) and (3) finishing transmission: and a buzzer connected through a 32 pin of the MCU prompts the NB-IoT wireless communication module to successfully transmit data to the terminal display platform. After the data are successfully transmitted, the MCU gives NB _ PWR high level to shut down, and NB _ EN pin low level disconnects the power supply switch;
specifically, as shown in fig. 4, the NB-IoT wireless communication module adopts a three-in-one wireless communication module of L651 NB-IoT + GSM/GPRS + GNSS, and is further connected to the radio frequency antenna and the internet of things SIM card, and the L651 module has the advantages of ultra-high sensitivity, ultra-small volume, ultra-low power consumption, ultra-wide operating temperature range (-40 to +85 ℃), output power: 23dBm 2 dB. LCC (lead Chip carriers) which is easier to weld is adopted for packaging, and rich hardware interfaces are supported: UART/ADC/SPI/I2C/GPIO and the like, embedded with rich network protocols (such as UDP/TCP/IP/MQTT/HTTP and the like), supporting Band3/5/8 frequency bands, supporting standard AT instruction sets (Attention), supporting GPS function positioning accuracy, and providing wireless mobile communication and accurate navigation positioning functions;
the NB-IoT wireless communication module workflow is as follows:
(1) the MCU main control circuit controls the NB-IoT wireless communication module to be powered on and started, and receives the data of the soil moisture sensor sent by the MCU through an asynchronous serial communication UART protocol;
(2) as shown in fig. 5, the NB-IoT wireless communication module is powered on through pins 16 and 17, receives a module start command through pin 40, enters an operating state, is connected to pins 13 and 12 of the MCU master controller through pins 43 and 44, respectively, and transmits data from the MCU to the NB-IoT wireless communication module;
(3) SIM card identity authentication accesses the NB-IoT network;
(4) the NB-IoT wireless communication module performs data processing and then sends the processed data to a data receiving and terminal display platform for data storage, display, analysis and processing;
(5) after data transmission is finished, the main control circuit MCU controls the NB-IoT wireless communication module to close and cut off power supply;
specifically, the radio frequency antenna is a Noll signal professional antenna with frequency ranges of 806MHz-960MHz and 1710MHz-1880MHz, the length of the antenna is 50mm, and an SMA-KWHD radio frequency connector is adopted;
specifically, the L651 module supports NB-IoT special SIM cards provided by three operators in China, and in order to improve the sensing transmission compatibility, the system uses a bidirectional and low-power-consumption FSA2567 type double-channel double-throw analog switch to realize the multiplexing of the double-channel SIM cards, and the design realizes the coexistence of telecommunication and mobile communication. Fig. 6(a) shows a dual-channel SIM card multiplexing chip, which receives power supply via SIM _ VDD (power supply method is the same as L651), and SIM _ SEL pin is directly connected to a pin corresponding to MCU, and MCU uses the SIM card by controlling the pin to switch between high and low levels. The SIM common ports SIM _ VCC, SIM _ DATA, SIM _ RST and SIM _ CLK of the multiplexing module are respectively connected with corresponding pins of the L651 module, SIM1_ VCC, SIM1_ DATA, SIM1_ RST and SIM1_ CLK are connected with corresponding pin controls of the dual SIM cards to realize telecommunication NB-IoT communication, and SIM2_ VCC, SIM2_ DATA, SIM2_ RST and SIM2_ CLK are connected with corresponding pin controls of the dual SIM cards to realize mobile NB-IoT communication.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. An integrally designed soil moisture content Internet of things monitoring system is characterized by comprising a soil moisture sensor, a central control unit of the monitoring system, a data receiving and terminal display two-dimensional code; the method comprises the following steps of integrally designing an analog sensor, a data acquisition instrument, a wireless transmission circuit, a solar power supply, a two-dimensional code of equipment and a microprocessing master control circuit (MCU);
the soil moisture content thing networking monitoring system's structure divide into the triplex: the pipe feeding machine box, the middle pipe machine box and the pipe discharging machine box are arranged in the middle pipe machine box; fixed monitoring system's central control unit in top tube machine box slot, central control unit include: the system comprises a solar photovoltaic panel, a charging and power management circuit, a data acquisition and wireless transmission circuit, an environmental parameter sensor and a positioning GPS chip; the solar photovoltaic panel is arranged on the upper surface of the tube installing machine box, a small hole is formed in the upper surface of the tube installing machine box, a power line of the solar photovoltaic panel is connected with the charging and power management circuit through the small hole, and the small hole is blocked by waterproof glue; a soil moisture sensor is fixed in the middle pipe machine box; a rechargeable lithium battery is fixed in the tube discharging machine box; the data line and the power line are respectively connected with the soil moisture sensor in the middle pipe and the rechargeable lithium battery power line in the lower pipe, and the pipe installing machine box, the middle pipe machine box and the lower pipe machine box are in screwed connection by threaded ports with waterproof sealing rings;
the soil moisture sensor is a multi-depth soil moisture sensor, is used for sensing soil moisture data and processing signals, and comprises a plurality of sensing probes, a soil moisture simulation detection circuit and a singlechip; the sensing probe is used as a reactance element of the analog detection circuit to be connected into the analog detection circuit, the soil moisture detected by the sensing probe is calculated by the output voltage of the analog detection circuit, the output voltage is directly input into the singlechip, and the singlechip performs storage, digital amplification and analog-digital conversion A/D conversion;
the central control unit of the monitoring system is used for storing the data of the soil moisture sensor and wirelessly transmitting the data, wherein the data acquisition and wireless transmission circuit comprises a microprocessing main control circuit MCU, an NB-IoT wireless communication module, an NB-IoT module, a radio frequency antenna and an SIM card;
the solar photovoltaic panel, the charging and power management circuit and the rechargeable lithium battery form a solar power supply module which is used for supplying power to the soil moisture content Internet of things monitoring system, and the charging and power management circuit is connected with the solar photovoltaic panel through a wire to charge the rechargeable lithium battery; the solar power supply module is respectively connected with the soil moisture sensor and the central control unit of the monitoring system;
the MCU is connected with an external passive crystal oscillator and used for waking up the MCU for timing; controlling a sensor sensing module switch to supply power to a sensing module through a SENSORS _ EN pin of the MCU, and acquiring data by the sensing module; receiving the collected data of the soil moisture sensor through an asynchronous serial communication port of the MCU; controlling the NB-IoT module to be powered on by giving NB _ EN high level to the MCU, and starting NB-IoT work by giving NB _ PWR low level 1s to the MCU; transmitting the data to an NB-IoT wireless communication module through other UART pins of the MCU for further data processing and wireless transmission; prompting the NB-IoT wireless communication module to successfully transmit data to the terminal display platform through a buzzer connected with the MCU; the MCU gives NB _ PWR high level to shut down, and NB _ EN pin low level disconnects the power supply switch.
2. The soil moisture content internet of things monitoring system of claim 1, wherein the main control circuit MCU is a control center of the soil moisture content internet of things monitoring system, the MCU data acquisition channel 1 is connected with the soil moisture sensor circuit, the MCU data acquisition channel 2 is connected with the environmental parameter sensor, the MCU data acquisition channel 3 is connected with the NB-IoT wireless communication module, and data are transmitted to a memory of a cloud server through a radio frequency antenna of the NB-IoT wireless communication module.
3. The soil moisture content internet of things monitoring system of claim 1, wherein the environmental parameter sensor comprises an air temperature sensor, an air humidity sensor and an atmospheric pressure sensor, and the environmental parameter sensor senses, acquires and processes environmental parameters, stores the environmental parameters in the main control circuit MCU, and packages and transmits the environmental parameters with soil moisture data.
4. The Internet of things monitoring system for soil moisture content according to claim 1, wherein the rechargeable lithium batteries are 2-3 rechargeable lithium batteries with a capacity of 2000mAh and are connected in parallel to form a rechargeable lithium battery with a capacity of 4000-6000 mAh, a power supply voltage range is 3.6-4.2V, and a charging current is 300 mA; the charging management circuit controls the charging process: the battery is protected from over-discharge, over-voltage, over-charge and over-temperature.
5. The soil moisture content internet of things monitoring system of claim 1, wherein the main control circuit MCU is responsible for data acquisition, data processing and transmission control, and the work flow of the main controller is as follows:
(1) initializing a perception module: controlling initialization and data acquisition of a soil moisture sensor and an environmental parameter sensor;
(2) receiving data: receiving data of a soil moisture sensor and an environmental parameter sensor;
(3) starting the NB-IoT wireless communication module to search a communication network;
(4) data processing: controlling data transmission to the NB-IoT wireless communication module for data processing;
(5) data transmission: and controlling the NB-IoT wireless communication module to transmit data to a cloud server.
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