Research On The Intelligent Instrument Based On Internet Using Embedded System

At present, kinds of temperature controllers used at home and abroad have many shortcomings, such as big errors, low demonstration precision, single function, too simple controlled algorithm and so on. So a kind of brand-new temperature controller is designed by using the embedded controlled technology and Ethernet which is widely used in-door and out-door to enhance the various functions of the temperature control system. The temperature control system turns the collected simulated voltage signals into a normal voltage signal through A/D conversions, intelligent operation of CPU, getting relevant outputting control flows and D/A conversions, which controls rock-bottom performing framework. The data is displayed in LCD and transmited to UMB by Ethernet interface. Realizing intelligent controlling, field displaying and high-speed data transmission of temperature controllers is completied, and the shortcomings of current temperature controllers are offset.The dissertation is composed of several parts: Firstly, an simple introduction of the development of the popular embedded system and the intelligent instruments is given; Secondly, an overall explanation of the structure of the intelligent instrumentbased on internet using embedded system——temperature controller is given; thirdly,the intelligent control algorithm of the whole temperature controller is illustrated ,and fuzzy self-adapting PID algorithm is used to control in the design of the temperature controller; fourth, the hardware of the temperature controller is designed, mainly the expansion of the CPU external memory units, LCD interface, Ethernet interface, A/D, D/A interface and so on; fifth, the software of the temperature controller is designed ,it includes two main parts :the design of lower-driven software and the design of upper application software; sixth, an introduction of uClinux operating system which is used in the temperature controller and the revision and transplantation of the system parameters of it is given. Finally, the conclusion and prospect of this subject is given, and the shortage is pointed out in the design.The embedded controlled technology and the new industrial Ethernet are used in the study of intelligent instruments. With integrated application of the high-speed computing capacity of the embedded Microprocessor, the intelligent control capacity of the fuzzy self-adapting PID control algorithm and the high-speed data transmission capacity of industrial Ethernet, such requirements as the low power consumption, high response speed and high accuracy of data collection can be realized in application process of spot industry.