CN104717306A - Greenhouse Internet-of-Things measurement and control system, and data synchronization method thereof - Google Patents

Abstract

The invention discloses a greenhouse Internet of things measurement and control system and a data synchronization method thereof. The system is composed of modules such as a data acquisition unit network group, a convergence node, an intelligent gateway, a remote server, and a remote monitoring device browser. In view of the need for data acquisition units and sensors to be easily changed due to changes in the greenhouse environment, or users need to increase the number of sensors of the same type to monitor environmental differences in the greenhouse, in order to realize the automatic processing and transmission of greenhouse environment monitoring information To adapt, the data synchronization method designed is as follows: the intelligent gateway adaptively analyzes the monitoring parameter values of the data flow by querying the pre-set data acquisition unit configuration table, and realizes the data synchronization between the data acquisition unit network group and the intelligent gateway. The intelligent gateway uses the XML data structure to encapsulate information such as data acquisition unit configuration and monitoring parameter values, and realizes data synchronization with the remote server through the Http Post transmission communication mechanism. The invention can be applied to the data transmission of the greenhouse environment measurement and control system based on the internet of things.

Description

A greenhouse IoT measurement and control system and its data synchronization method

technical field

The invention belongs to the technical field of the agricultural internet of things, and in particular relates to a greenhouse measurement and control system based on the internet of things and a data synchronization method thereof.

Background technique

With the rapid development of information technology, Internet of Things technology has been more and more applied in facility agriculture. The development of sensor technology, wireless network, microcomputer technology and Internet has further promoted the monitoring and management of greenhouse environmental information. A typical greenhouse IoT system includes three levels: perception, transmission, and application. The perception layer uses sensor technology to obtain environmental information, mainly including climate information such as temperature, light, humidity, and _CO2 concentration in the greenhouse, environmental information such as soil moisture, pH value, and EC value, and outdoor meteorological information. The transport layer transmits to the gateway of the Internet of Things through wireless network technology, mainly Zigbee technology. The gateway realizes the unified aggregation and calculation processing of information, and transmits it to the Internet. The remote application server realizes the storage of the greenhouse monitoring data, realizes the user-oriented portal website or realizes the greenhouse environment monitoring in the form of the client. Considering that the data acquisition unit and sensors are susceptible to factors such as changes in the greenhouse environment and often need to be changed, or the user needs to increase the number of sensors of the same type to monitor environmental differences in the greenhouse. How to realize the information processing and transmission of the intelligent gateway brought about by the change of the sensor and the data acquisition unit and the self-adaptation of the information processing and transmission of the remote server is a core of the intelligent operation of the greenhouse IoT.

Contents of the invention

The purpose of the present invention is to provide a greenhouse IoT measurement and control system and its data synchronization method to realize the self-adaptation of intelligent gateway information processing and transmission and remote server information processing and transmission brought about by the change of sensors and data acquisition units.

In order to solve the above technical problems, the specific technical scheme adopted in the present invention is as follows:

A greenhouse Internet of things measurement and control system, comprising a data acquisition unit network group (1), a convergence node (2), an intelligent gateway (3), a remote server (4), and a remote monitoring device browser (5); it is characterized in that: The data acquisition unit network group (1) adopts solar energy and storage battery system for power supply, connects sensors through Zigbee data acquisition unit, and collects light, temperature, humidity, _CO2 concentration and meteorological information outside the greenhouse respectively; adopts star-shaped Zigbee communication The protocol self-organization forms a wireless transmission network group and conducts wireless communication with the convergence node (2); the convergence node (2) converts the Zigbee protocol data flow and the serial communication data flow and then synchronizes them to the intelligent gateway (3); the intelligent gateway (3) Access the Internet through 3G or Wi-Fi module, and establish data synchronization with the remote server (4) based on the HttpPost transmission communication mechanism (6); the remote server (4) adopts B/S structure to construct the user monitoring device browser (5) WEB access.

The data synchronization method of the described a kind of greenhouse Internet of Things measurement and control system is characterized in that comprising the following steps:

Step 1, the intelligent gateway (3) defines the data acquisition unit configuration table, which includes: data acquisition unit ID, monitoring parameter name, monitoring parameter ID, unit, location, monitoring parameter value in the initial byte of the data stream, Monitoring parameters in the final byte of the data stream, offset, numerical conversion coefficient, minimum value of monitoring parameters, maximum value of monitoring parameters;

Step 2, the intelligent gateway (3) obtains the hexadecimal data stream collected by each data acquisition unit in the data acquisition unit network group (1) through the convergence node (2), and according to the data acquisition unit ID corresponding to the first byte of the communication data stream, Query the configuration table of the data acquisition unit to obtain the descriptive information such as the first byte, the last byte, and the monitoring parameter ID of each monitoring parameter value in the data stream; After the monitoring parameter value is extracted and converted into decimal, the actual value is calculated according to the offset and numerical conversion coefficient, and a monitoring parameter value table with the monitoring parameter ID as the column description name is generated;

Step 3, the intelligent gateway (3) uses the XML data structure description standard to encapsulate the data acquisition unit configuration information and monitoring parameter values, and store them in the local XML file library;

Step 4, the intelligent gateway (3) initiates the data acquisition unit configuration information, "heartbeat" count value, monitoring parameter value described in the XML data structure to the remote server (4) through the HttpPost transmission communication mechanism (6), and the remote server (4) according to The XML encapsulation protocol analyzes the configuration information of the data collection unit and the value of monitoring parameters and updates the database. Remote server (4) parses the "heartbeat" connection process, judges the synchronous command sign of monitoring equipment browser (5), if effective then uses the XML data structure description standard to carry out encapsulation to the data acquisition unit configuration information of remote server (4) The intelligent gateway (3) is synchronized.

The present invention has beneficial effects

By defining the configuration table of the data acquisition unit, the present invention realizes the adaptive analysis of the monitoring parameter value of the data stream of the data acquisition unit and the adaptive encapsulation of the XML data structure description standard of the synchronous data, and performs data transmission through the HttpPost transmission communication mechanism , realizing the data synchronization method between the intelligent gateway and the server, which is conducive to the rapid deployment and application of the Internet of Things measurement and control system, and effectively solves the problem of the Internet of Things measurement and control system caused by the dynamic increase or decrease of sensors or data acquisition units in the greenhouse Internet of Things application. The secondary development provides a general method for the monitoring and management of agricultural information.

Description of drawings

Fig. 1 is a system structure diagram of the present invention;

Fig. 2 is a flow chart of the data synchronization work of the system of the present invention.

In the figure: 1. Data acquisition unit network group, 2. Convergence node, 3. Intelligent gateway, 4. Remote server, 5. Remote monitoring device browser, 6. HttpPost transmission communication mechanism.

Detailed ways

In order to make the content of the present invention more clearly understood, the technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific examples.

The system structure of the present invention is shown in Figure 1.

1. Data acquisition unit configuration: the user sets the basic information of the data acquisition unit through the intelligent gateway 3, including the data acquisition unit ID, monitoring parameter name, monitoring parameter ID, unit, location, and monitoring parameter value in the first byte of the data stream, The monitoring parameters are configured and registered at the end byte of the data stream, the offset, the numerical conversion coefficient, the minimum value of the monitoring parameter, and the maximum value of the monitoring parameter, and the configuration table of the data acquisition unit is established, and stored in the intelligent gateway 3 in the database.

2. Zigbee network data synchronization: Zigbee network data synchronization is mainly to realize the Zigbee network group 1 formed by the data acquisition unit in the greenhouse to extract the actual value of the monitoring parameters collected by the sensor from the data stream sent to the intelligent gateway 3 through the convergence node 2. The specific method is: first, take out the data acquisition unit ID corresponding to the first byte of the serial communication data stream, query the data acquisition unit configuration table in the database to obtain the first byte, the last byte, and the monitoring parameter ID of each monitoring parameter value in the data stream and other description information. Then, according to the values of the first byte and the last byte, the initial value of the hexadecimal monitoring parameters in the communication protocol data stream is extracted, converted into decimal, subtracted the offset, multiplied by the numerical conversion coefficient, and calculated actual value. Finally, a monitoring parameter value table with the monitoring parameter ID as the column description name is generated and stored in the database of the intelligent gateway 3 . For example, the hexadecimal data stream of air humidity collection is (F1 0302 03 11 78 51), the air humidity value is the 4th to 5th bytes of the data stream, the offset is 0, and the conversion factor is 0.1. Firstly, according to the 4th to 5th bytes, the initial value is extracted as 0311 (hex). After converting it into decimal, subtract 0, and then multiply it by the conversion factor 0.1. It can be known that the value of air humidity is 78.5.

3. Encapsulation of transmission data: the intelligent gateway 3 encapsulates the configuration information of the data acquisition unit by describing and encapsulating the XML data structure, as shown in Table 1.

Table 1 XML-based encapsulation of data acquisition unit configuration information

The monitoring parameter values parsed from Zigbee network data are described and encapsulated in XML data structure, as shown in Table 2, and stored in local XML files.

Table 2 XML-based monitoring parameter numerical encapsulation

4. Internet data synchronization: the intelligent gateway 3 initiates the HttpPost transmission communication mechanism 6 request to the remote server 4 and processes the response information of the remote server 4 to realize data synchronization. The workflow is shown in Figure 2, including 3 types of data communication:

a. The user clicks on the control to trigger the smart gateway 3 to synchronize the message content of the XML-encapsulated data acquisition unit configuration information to the remote server 4 . The remote server 4 parses the message content to obtain various description information of the configuration of the data acquisition unit, updates the configuration table of the data acquisition unit in the database, and responds to the intelligent gateway 3 about data synchronization. The intelligent gateway 3 receives and judges the response information to prompt.

b. The intelligent gateway 3 initiates a "heartbeat" count with a small amount of data to connect to the remote server 4 at a period of 20 seconds. The remote server 4 judges whether the remote monitoring device browser 5 has the command flag for synchronizing the intelligent gateway 3 data acquisition unit configuration: if there is, the remote server 4 queries the database and carries out the description encapsulation of the XML data structure of the data acquisition unit configuration information, and combines " Heartbeat" confirmation message is responded to the intelligent gateway 3. The intelligent gateway 3 receives and updates the configuration form of the data acquisition unit in the database, and sets the communication status as normal communication; if not, initiates a "heartbeat" confirmation response with a small amount of data to the intelligent gateway 3, and the intelligent gateway 3 receives and sets the communication status For normal communication. If the intelligent gateway 3 does not receive a response message from the remote server 4 within 6 seconds, the communication status is set as abnormal communication.

c. The intelligent gateway 3 synchronously monitors the parameter value information with a period of 1 minute. First, read the content of the local XML file used to store the monitoring parameter values. Whenever the transmission cycle arrives, judge whether the communication is normal: if the communication is normal, write the XML encapsulation description of the monitoring parameter value to the end of the root node of the local XML file, and then read the content of the local XML file (if the communication is abnormal before There are multiple records, and there is one record if the communication was normal before), and uploaded to the remote server 4 through the HttpPost transmission communication mechanism 6. The remote server 4 judges the number of records of the encapsulated monitoring parameter data, analyzes each monitoring parameter ID and value from top to bottom, updates the monitoring parameter value table in the database, and responds to the intelligent gateway 3 about data synchronization. The intelligent gateway 3 judges the data synchronization situation: if the response is correct, the record in the local XML file will be cleared; otherwise, the record will be kept. If the communication status between the intelligent gateway 3 and the remote server 4 is failure, the XML encapsulation description of the monitoring parameter value is written to the end of the root node of the local XML file, and the HttpPost transmission communication mechanism 6 request is not initiated.

The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (3)

1. a greenhouse Internet of Things TT&C system, comprise data acquisition unit network group (1), aggregation node (2), intelligent gateway (3), remote server (4) and remote supervisory and control(ling) equipment browser (5), it is characterized in that: described data acquisition unit network group (1) adopts solar energy and battery system to power, by Zigbee data acquisition unit connecting sensor, gather warm indoor illumination, temperature, humidity, CO respectively ₂weather information outside concentration and greenhouse; Star-like Zigbee communication protocol ad hoc mode is adopted to form wireless-transmission network group and aggregation node (2) carries out radio communication; Aggregation node (2) is synchronized to intelligent gateway (3) after Zigbee protocol data flow and serial port communication data stream being changed; Intelligent gateway (3), by 3G or Wi-Fi module accessing Internet, is set up and the data syn-chronization of remote server (4) based on Http Post transport communication mechanism (6); Remote server (4) adopts the WEB access of B/S structure construction user monitoring device navigator (5).

2. the method for data synchronization of a kind of greenhouse according to claim 1 Internet of Things TT&C system, is characterized in that comprising the following steps:

Step one, intelligent gateway (3) definition data acquisition unit allocation list, comprises in described table: data acquisition unit ID, monitoring parameter title, monitoring parameter ID, unit, place, monitoring parameter at the beginning byte of data flow, monitoring parameter in whole byte, side-play amount, numerical value conversion coefficient, monitoring parameter minimum value, the monitoring parameter maximum value information of data flow;

Step 2, intelligent gateway (3) obtains each data acquisition unit in data acquisition unit network group (1) by aggregation node (2) and gathers 16 binary data streams, the data acquisition unit ID corresponding according to communication data stream first byte, data query collecting unit configuration form obtains each monitoring parameter numerical value to be begun the descriptors such as byte, whole byte, monitoring parameter ID in a stream; According to the numerical value of beginning byte, whole byte, 16 system sensor values in communication protocol data stream are carried out extracting and after changing into 10 systems, calculate actual value according to side-play amount, numerical value conversion coefficient again, generate with the monitoring parameter numerical tabular of monitoring parameter ID for row description name;

Step 3, intelligent gateway (3) adopts XML data structure description standard to encapsulate data acquisition unit configuration information, monitoring parameter numerical value, is stored to local XML file storehouse;

Step 4, intelligent gateway (3) initiates to remote server (4) data acquisition unit configuration information, " heartbeat " count value, the monitoring parameter numerical value that XML data structure describes by Http Post transport communication mechanism (6), and remote server (4) carries out parsing according to collecting unit configuration information, monitoring parameter numerical value according to XML tunneling and more new database.

3. the method for data synchronization of a kind of greenhouse according to claim 2 Internet of Things TT&C system, it is characterized in that: remote server (4) is resolved in " heartbeat " connection procedure, judge the synch command mark of watch-dog browser (5), if effectively, use the data acquisition unit configuration information of XML data structure description standard to remote server (4) to encapsulate to intelligent gateway (3) synchronous.