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1. System background
People are paying more and more attention to environmental issues. For this reason, Beijing Chuangyi Xingsheng Technology Development Co., Ltd. has developed a variety of LoRa products, such as LoRa control terminal CY-LRB-102, LoRa detection terminal CY-LRB-101, LoRa control terminal CY- LRW-102, LoRa detection terminal CY-LRW-101 and other product models, as well as a number of products are under development, through LoRa narrowband IoT technology to achieve the environment in the place, including pm2.5, CO2 content, light, dust particle concentration , The monitoring of ambient temperature and air pressure, etc., to create a LoRa environment monitoring IoT system, through the monitoring of the environment to achieve early warning of the environmental state, and to achieve the transition from passive tolerance to active defense.
A LoRa control terminal can connect 16-32 environmental sensors. LoRa long-distance communication greatly reduces the cost of relaying. The system can be applied to various scenes that need to monitor real-time environmental status, such as industrial parks, residential areas, schools, etc., to realize real-time monitoring and early warning of the environment.
2. System composition and overall design
The LoRa environment monitoring IoT system is composed of various environmental sensors, LoRa control terminal CY-LRB-102, LoRa detection terminal CY-LRB-101, DDC equipment and cloud data management platform.
The overall network topology of the system is shown in Figure 1, which mainly includes the environmental data management center, LoRa control terminal CY-LRB-102, LoRa monitoring terminal CY-LRB-101 and DDC equipment. The system LoRa control terminal CY-LRB-102 and All kinds of sensors are connected in a wired one-to-many manner to collect the analog data of the sensor; LoRa control terminal CY-LRB-102 and LoRa monitoring terminal CY-LRB-101 adopt LoRa wireless one-to-one communication to transmit the analog data of the sensor Data: The LoRa monitoring terminal CY-LRB-101 is connected to the DDC equipment in a wired many-to-one manner, sending environmental information to the DDC equipment, and uploading the data to the environmental data management center.
The LoRa control terminal CY-LRB-102 connects with the sensor through RS485 according to the modbus communication protocol, and communicates with the LoRa monitoring terminal CY-LRB-101 through the ultra-long-distance wireless communication capability of the LoRa network; LoRa monitoring terminal CY-LRB- 101 is connected to the DDC device through RS485 according to the bacnet communication protocol, and the collected environmental data is transmitted back to the environmental data management center through the DDC device. Both the LoRa control terminal CY-LRB-102 and the LoRa monitoring terminal CY-LRB-101 have a modbus/bacnet communication protocol mechanism, and the communication mechanism can be switched as needed. If an obstacle is severely blocked and the LoRa control terminal CY-LRB-102 and the LoRa monitoring terminal CY-LRB-101 cannot communicate normally, a relay node can be added to transmit the collected data to the LoRa monitoring terminal CY-LRB-101 .
Through the analysis and processing of the collected data, the environmental data management center intelligently analyzes the status of each connected sensor and converts it into valuable information for authorized users to access and use. It can be seen that the system can realize functions such as power-on and ready-to-use, simple network, data upload, data distribution, anti-interference, etc., and realize the collection and management of environmental data. The system not only provides convenient query and management for the environmental data management center, but also provides intelligent decision-making to help the management center improve its service level.
Figure 1 System topology diagram
Figure 2 Detailed data transmission diagram
Three, the main function of the system
3.1 Data collection
Data such as environmental smoke, pm2.5, CO2, temperature and humidity are transmitted to the cloud center through the wireless network for intelligent analysis and processing;
3.2 Data storage
The system can store historical data to form a knowledge base for processing and query at any time;
3.3 Data analysis
The system will display the collected values to the user in an intuitive form of time distribution status (line chart) and spatial distribution status (field chart), and provide historical reports such as daily and monthly reports;
3.4 Remote control
Users can remotely view data such as environmental smoke, pm2.5, CO2, temperature and humidity at any time and any place through any terminal with Internet access;
3.5 Mobile phone monitoring
4G mobile phones can achieve the same functions as computer terminals, real-time viewing of various data sent by sensors.
Figure 4 System interface
Four, system characteristics
The system adopts a 4G+LoRa full wireless architecture, no wiring construction is required, and maintenance costs are low.
The green, environmentally friendly, and radiation-free sensor network has the characteristics of ultra-low power consumption that is synchronized across the entire network. The wireless collection terminal can work for more than 3 years using two alkaline batteries; the network is automatically load balanced, and the power consumption of all wireless nodes in the network can be evaluated. And the power consumption is similar to automatic networking, self-maintenance, network connection visible, stable operation around the clock without manual intervention, various management methods, all monitoring can be managed by directly accessing the gateway or network server; the management software has a good interface, powerful functions, and guarantees Data recording and analysis are timely, accurate, stable and reliable. The wireless sensor network works independently without paying any fees. Data from multiple collectors is sent through one gateway in a unified manner, saving 4G data charges.
Five, product introduction
5.1 LoRa control terminal CY-LRB-102
Product Image
Figure CY-LRB-102
DO1~DO8: Switch control interface, which can control the switch status of relay terminals 1~8.
DI1~DI5: It is the detected switch, which maps the switch status detected by the terminal.
Power indicator: It is the power indicator.
Signal control feedback light: Every time the control terminal changes, it will be accompanied by a signal feedback, and the light will flash once.
Product specifications
5.2 LoRa monitoring terminal CY-LRB-101
Product Image
Figure 5 CY-LRB-101
Product specifications
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