The Design Of Temperature And Humidity Acquisition System Based On WSN

Brewing is one of the necessary processes of production for the wine and medicine corporations. The technical parameters, such as the strict control of temperature and humidity, directly concern product quality. It is significant for the monitors to perceive the problems of quality in the processes of brewing and to solve the problems immediately. Accordingly, spot-check to finished product is meaningless. In a word, it is crucial to detect the process of brewing uninterruptedly.Taking the control of brewing temperature as an example, the usual wired observation system is unpractical in respect that the range of operating and the working environment is restricted by the length of wire. Another shortcoming is that the fixed position determines the fixed quantity of bleeding points,which can not be enhanced facilely. The third disadvantage is that the cost of system expansion is expensive. Besides, the quantity of data collection is finite. Even so, lots of corporations are unable to adopt the wired observation system because of the abominable working environment and the corrosive liquid. The method these corporations customarily use is to engage veteran technicians who can experientially control the process of brewing by sight and touch of hands. Consequently, the situations mentioned above conduce to the qualitative instability, and to weaken the modernization of brewing.In order to satisfy the modern corporations'factual needs of brewing, this project accomplish the thermostatic system which is designed for supervising the process of brewing, combining the techniques of wireless sensor network(WSN).First of all, I will introduce the naissance and development of WSN, which can be divided into four periods:The first generation of WSN adopts the traditional sensor which is able to receive simple informational signals. The network is made up of sensor and controller, which are connected by point-to-point transmission.The second generation of WSN possesses the integrated abilities for receiving different kinds of informational signals. This sensor network can synthesize kinds of information, which is connected with the controller by series-wound and shunt-wound interfaces (e.g. RS232, RS485 unit).The third generation of WSN emerged between the late 1990s'and the beginning of the 21century. The intelligent sensor network is a local area network, made up of an intelligent sensor receiving kinds of informational signals and connected with the controller by locale trunk line.The fourth generation of WSN is being invented. This network is made up of many multifunctional sensors, which have abilities for receiving different kinds of informational signals, automatically connected with wireless network and linked with the controller of sensor network. The characteristics of this system are large-scale, dynamic, self-organizing, limitedly battery-conserving, redundancy, amalgamation of node code, dependability of network, data as linchpin, and so on.Secondly, I will introduce the application of the WSN to military affairs, the public and academia. Besides, I will recommend the pivotal techniques of this network.Based on these techniques, we are able to build up the hardware circumstance. In this project, I will interpret detailedly the principles of the system's hardware framework and the design of this machine's exterior. Furthermore, regarding to the environmental requirements of this project, I will design correspondingly the appropriate outer cover.According to the circuit design, I will expatiate on the chipsets and their main functions, such as microcontroller MSP430F149, temperature sensor DS18B20, and temperature humidity sensor SHT11. Simultaneity, I will give a brief introduction on the voltage monitoring module MAX708s and resetting module 809.I will give a detailed statement of the software adopted as designing in two chapters, concerning towards its significant and difficult roles in this project. In this part, in the first instance, I will expound the operating system TinyOS and nesC, which play important technical roles in this project. Moreover, there will be a detailed statement on closely mutual relationship among module, groupware, and interface. In the end of this part, I will deliver the main course of the software and the indispensable source program of C language with the intention of readers'deeper understanding on the working process of this system.The main achievement of this thesis is scheming out a node gathering the thermometric information, based upon the principle of WSN. This frame can be used in uninterruptedly inspecting and controlling the surroundings of fermentation in the process of brewing. These techniques will be adopted by a wine corporation instantly.The practice of manipulating according to the thesis provides the referenced value in the applications of temperature sensor and temperature humidity sensor to the WSN. Another achievement of this thesis is to present a primary template generalizing the utility of WSN. Nevertheless, for the limit of time, there must be several mistakes in this thesis. Undoubtedly the design needs precise amelioration.