Smart greenhouse wireless temperature and humidity acquisition system program
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The intelligent greenhouse system is a resource-saving and high-efficiency facility agriculture technology that combines computer automatic control technology, intelligent sensor technology and other high-tech means. It is mainly based on factors such as environmental temperature, humidity, carbon dioxide content, light, rainfall, and soil conditions. , To control various indicators and various nutrient element formulas in the greenhouse to create the best environment suitable for crop growth. Obviously, how to obtain these environmental information accurately, stably and conveniently has become the key to the entire system. With the development of short-range wireless communication in recent years, the emerging wireless sensor network technology provides a strong technical guarantee for the sensor link in the intelligent greenhouse system.
Relying on years of accumulation in the fields of short-range wireless communication standards, chips and product technology, Beijing Weixun Amethyst Technology Co., Ltd. independently developed a protocol stack that can support large-scale self-organization and self-maintenance wireless sensor networks, namely USSN (Ultra- Scale Sensor Networks) technology, and based on this technology, has developed a smart greenhouse wireless temperature and humidity collection system with independent independent intellectual property rights, which can provide all-weather, unattended, maintenance-free and power-independent wireless temperature and humidity collection services.
USSN refers to a network formed by a number of wireless collection terminals connected to each other in a wireless manner. If there are several wireless collection terminals within a certain range, the data at any point can be forwarded by other neighboring nodes. Data forwarding can multiply the communication distance between two points and expand the network coverage. The terminal data is finally transmitted through the network and then collected to the data collection terminal, and then transmitted from the collection terminal to the upper computer through other communication protocols and methods. The schematic structure is as follows:
System significance:
The intelligent greenhouse is the result of applying the intelligent control system to the greenhouse planting, using the most advanced technology to simulate the most suitable environment for the growth of plants in the greenhouse. Compared with manual control, the biggest advantage of intelligent control is the relatively constant control of the environment inside the greenhouse. For plants with higher environmental requirements, it can better avoid production losses due to human factors. The intelligent control system will greatly improve the yield and quality, especially for high-grade cash crops.
Function description:
The whole system is composed of wireless data collector, wireless switch controller, wireless data gateway (multiple), PC and network server (optional). The gateway, collector and controller adopt USSN sensor network technology for wireless connection. Each gateway can connect to hundreds of terminal devices at the same time, and all terminals are automatically networked and work synchronously. The gateway and PC or web server are connected via Ethernet or mobile communication network.
The collection terminal integrates a high-precision temperature and humidity sensor. All terminals are connected wirelessly, and all of them can be powered by batteries, which eliminates the installation problem of power cords and data lines, and makes it possible to change positions at will. In practical applications, the collection terminal can integrate various sensors such as temperature, humidity, light, carbon dioxide concentration, and soil environment according to actual needs.
The wireless sensor data collector is equipped with reserved terminals, which can be connected to various sensors such as soil temperature, humidity, and light as required.
The wireless switch controller can be connected in parallel with the original electric control system, and can be used to control film rolls, curtain rolls, fans, irrigation devices, etc.
The gateway is at the core of the system. The data collected by all sensors must be collected in the gateway, and all control commands to the terminal must also be sent down through the gateway. The gateway has a built-in powerful operating system that can maintain and store the network and data. After the PC directly logs in to the gateway through a network cable or a local area network, operations such as system settings, network management, data viewing, graphing, and data export can be performed. The gateway also has the remote transmission capability, and all configuration data and collected data are transmitted to the network server through the local area network or 3G. This mode supports multiple users to log in to the network server at the same time to view the data of the gateway.
Both the wireless data gateway and the network server provide powerful and user-friendly software. After logging in to the gateway or network server according to different operating permissions, users can perform system settings, network management, data viewing, charting, data export, alarm management and other operations.
typical application:
We take centralized greenhouse farming as an example to explain the typical application of wireless temperature and humidity acquisition system in practice, please see the following figure:
In actual greenhouse planting, different crops may be cultivated in various regions, and their requirements for temperature and humidity are not the same. Therefore, these indicators need to be tested regularly in order to take corresponding measures to provide the most suitable growth environment for the crops. According to actual testing needs, the wireless temperature and humidity collection terminal can be installed in the corresponding location. All temperature and humidity collection terminals are battery-powered and data transmission is performed wirelessly, so there is no need to consider the installation of power cords and data lines. It can be plug and play.
During the installation process, you need to ensure that each terminal can connect to the wireless network. If there are individual monitoring points located far away, consider increasing the number of terminals in the communication path and forwarding the data of the farther terminals to ensure the stability of the network.
After all terminals are normally installed, they will automatically set up a wireless network according to the instructions of the data collector, collect temperature and humidity values at preset time intervals, and collect the data into the wireless data gateway. Eventually all data will be transmitted to the remote management center via GPRS or 3G network.
Each such network can accommodate hundreds or even thousands of collection terminals. Each large area is equipped with a gateway. The data is effectively uploaded without collision or loss. The gateway transmits the data to the large network in time, as long as it passes through the network. Access the gateway, you can get data at any time.
System Features:
The system adopts 3G+USSN full wireless architecture, no wiring construction is required, and maintenance cost is low
USSN wireless sensor network technology complies with IEEE802.15.4C international standard and CWPAN national standard, green, environmentally friendly, and non-radiation
The USSN sensor network has ultra-low power consumption characteristics that are synchronized across the entire network. Energy-saving sensor nodes can work for more than 1 year using ordinary battery power.
Automatic network load balancing, the power consumption of all wireless nodes in the network can be evaluated, and the power consumption is similar
Automatic networking, self-maintenance, visual network connection, stable operation around the clock, without manual intervention
All wireless collectors are easy to install, plug and play, and the installation position can be changed arbitrarily without being restricted by cables
Good network expansion capabilities, increase and decrease the number of collection terminals at will, support hundreds of collectors and controllers in the same network
Frequency hopping and encryption authentication mechanism to ensure the safe and reliable operation of the system
Various management methods, users can directly access the gateway or network server to manage all monitoring
The management software has a friendly interface and powerful functions to ensure timely and accurate data recording and analysis, and the system is stable and reliable
The wireless sensor network works independently and does not need to pay any fees. The data of multiple collectors are sent through a gateway in a unified manner, saving 3G data charges.
Technical index:
*In order to meet the general needs of the system, the system terminal only integrates temperature and humidity sensors, and other sensors can be customized.
Temperature and humidity collection terminal: high-precision temperature and humidity sensor
Temperature measurement: range -20℃～100℃ accuracy +0.4℃
Humidity measurement: range 0%～99% accuracy +3%
RF parameters: working frequency band ISM 2.4GHz transmission power 1mW
Communication distance: 30 meters indoor between two points, 100 meters outdoor
Energy consumption index: when the collection interval is 15 minutes, two Nanfu AA1.5V batteries can work for 2 years, and the time fluctuates according to the collection interval and the actual environment
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