Cross Strait Quad-Regional Radio Science and Wireless Technology Conference, Vol. 2, p.p. 980 – 984, July 2011 Cross Strait Quad-Regional Radio Science and Wireless Technology Conference, Vol. 2, p.p. 980 – 984, July 2011
Abstract Introduction Overall design of monitoring system System hardware design Fuzzy PID control strategy and design System software design System test results and analysis Conclusions Reference Outline
Aiming at the actual demand of environmental information monitoring, an indoor temperature and humidity monitoring system based on fuzzy-PID strategy is designed. The system uses CC2430 as the core to develop wireless sensor nodes which follow the ZigBee communication protocol, uses the data collection terminal with high- precision temperature and humidity sensor to collect temperature and humidity data of the environment, uses ZigBee technology to achieve networking of wireless sensors and the automatic aggregation of monitoring data, and uses the fuzzy PID control algorithm to improve the accuracy of test data. Abstract
The indoor temperature and humidity regulation is achieved based on fuzzy PID control technology. The management function of various sensor nodes and a large number of environmental data is achieved based on embedded database. The monitoring results for temperature and humidity have shown that this system is stable, high reliable in data transmission and easy to use, and can be widely used in various areas of automatic monitoring of environmental parameters. Abstract
People's daily life is closely related to temperature and humidity of the surrounding environment, and there are also higher requirements for temperature and humidity in industry, agriculture and other fields. Therefore, it has become a very important technology on the temperature and humidity monitoring and control in the production process [1]. Introduction
The layout of traditional indoor temperature and humidity monitoring system are mostly wired communication, such as field bus, distributed control bus, which is complicated wiring and is not conducive to change and maintain the system layout [2-4] An indoor temperature and humidity intelligent control system is designed using wireless sensor network technology, advanced computer technology, microprocessor control technology and intelligent sensor data acquisition technology. Data collection terminal is made up of the CC2430 wireless communication modules, which can monitor continuously onsite environmental temperature and humidity in real-time. Introduction
Fuzzy PID control algorithm is applied to process parameter values, which improve the control accuracy. The PC in the monitoring center can effectively control the data collection terminal and can display, storage, analysis and process data in real-time, which achieve the control purposes to the indoor environmental parameters. Introduction
A. System Requirements Analysis : Through investigation and analysis, the applications of environmental monitoring system include that the factors of environment are sampled and processed in real-time in 24 hours and put into a database for the query, the sampled data are transmitted and aggregated in real-time by low-cost, low- power wireless communication in order to provide diagnosis, limit alarm function, the intuitive system management platform is provided to complete functions such as sensor management, environmental information processing, storage, analysis and so on, information is processed on the basis of the detection, and control signals are formatted and output based on predetermined control strategy. Overall design of monitoring system
B. System Architecture Design : The overall structure of system is shown in Figure 1, which is based on ZigBee tree topology and includes sensor nodes composed of ZigBee terminal nodes, gateway nodes served by the ZigBee coordinator, and the monitoring center composed of a PC and related management software. The task of sensor node is to collect indoor temperature and humidity and transmit the data to the gateway node. Gateway node is responsible for receiving data information and communicating with the monitoring center by the serial port. The monitoring center provides a graphical operating environment and displays data for the staff to query Overall design of monitoring system
System hardware design
Fuzzy PID control strategy and design
System software design
System test results and analysis
Aiming at the disadvantage existing in the current monitoring system of indoor environment, a real-time indoor temperature and humidity monitoring and controlling system based on ZigBee CC2430 and fuzzy PID strategy was designed. The management system of indoor environmental parameters based on embedded database can effectively manage various sensor nodes and a large number of environmental data. The system has the advantages of low-cost, low power, no wiring, flexible networking and friendly interface and so on. The results have shown that this system can promptly detect changes in indoor temperature and humidity and can control the decisions. Conclusions
Reference