With the acceleration of agricultural modernization, agricultural management has become more centralized, and intelligent management of agriculture has gradually emerged. Managers can remotely monitor the growth of crops while sitting in the office or at home. This depends on the rapid development of wireless communication technology. ZigBee technology is characterized by high reliability, low cost, low power consumption, and high security. It is widely used in industrial control, smart homes, commercial buildings, and agricultural automation. Intelligent monitoring of vegetable plants is a typical case.
How does ZigBee achieve vegetable plant monitoring?
One, ZigBee wireless sensor technology
ZigBee defines a series of communication protocols needed for short-range, low-data-rate wireless communications. The ZigBee protocol standard adopts a hierarchical structure. Each layer provides a series of special services for the upper layer: data entities provide data transmission services; and management entities provide all other services. The Zig Bee protocol is divided into two parts. IEEE 802.15.4 defines the physical layer and the media access control layer. The ZigBee Alliance defines the network layer and application layer architecture on this basis, and provides application support sublayers and ZigBee devices in the application layer. Object.
Second, vegetable plant monitoring system overall control framework
The overall control framework of the vegetable plant monitoring system consists of three parts: the master control unit, the room node monitoring unit, and the food monitoring unit. There are multiple rooms in the vegetable factory. Each room is equipped with a room node monitoring unit. Each room has a plurality of shelves and each shelf is equipped with a monitoring unit for the food shelf nodes.
The function of the main control machine: 1) As a server, receives and stores the data of each room node and the food shelf node, realizes the overall monitoring of the vegetable factory through the web browser; 2) After obtaining the corresponding authority, the relevant room node and The vegetable rack node sends control commands or data acquisition commands.
The function of the room node monitoring unit (including the overall monitoring unit): 1) The room node monitoring unit is responsible for air conditioning control, CO2 concentration collection and power management in each room; 2) The overall monitoring unit is responsible for the central air conditioning control, CO2 generator control and the entire Power plant management.
The function of the monitoring unit of the food shelf node: 1) After receiving the data acquisition command of the host computer, the temperature, humidity, and image data of the Penley rack are collected, and the data is sent to the master computer; 2) The master control is received After the control command of the machine, the brightness and darkness of the LED lamp of the vegetable dish, the nutrient solution circulation pump and the solenoid valve are controlled.
Third, wireless transmission network module
The vegetable factory monitoring system is based on ZigBee's 485 wireless communication module. In the wireless network, a coordinator, a router, and multiple terminal nodes are configured. The coordinator communicates with it through RS485, and forwards wireless network data through routers. Terminal nodes are used to send and receive data and commands for each room and dish rack.
Four, 4-20mA acquisition module (4-20mA signal / data acquisition module)
In the vegetable plant monitoring system, a 4-20mA acquisition module based on ZigBee was used to collect relevant data such as carbon dioxide concentration, temperature and humidity inside the room.
The vegetable factory monitoring system is based on the ZigBee wireless sensor network, realizing intelligent monitoring of crops in real time, and the system is stable and reliable.
Shanghai Shunzhou Intelligence has been engaged in research and development in the ZigBee field since 2004. The current achievements involve ZigBee-based 485 wireless communication modules/devices, 4-20mA acquisition modules/devices, intelligent gateways, intelligent single-light controllers, smart light poles, etc. .
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