| Flow totalizer is an important component of intelligent apparatus . With the development of modern computer technology , flow totalizer develops correspondingly quickly . Aiming at being small and intelligent, we use P89C51RD2 MCU as main controller of the system, which has the ability to download programs . To provide workers a friendly interface, we design a controlling board with LEDs and a mini-keyboard;Acording to requirement .printing and data storing and switch output are also designed ; We choose AC-DC power module as the system power. So all above compose of a high precise platform.Firstly, there is a synopsis of intelligent apparatus and flow totalizer ;In the 2nd chapter, many measuring principals and methods about flow are analyzed, corresponding compensation and errors are also analyzed;In the chapter 3, the function of ISP and the IAP in MCU, especially the application of ISP on system development is specified in detail, we also discuss other function electric circuits in this chapter, including clock/calendar circuit, input and output signal translating circuit, displaying and keys circuit, and printing output circuit. In the chapter 4, some mathematic modules are constructed , which are rules of the system programs, we use second-grade parameters to identify input signals. Based on mathematic modules and second-grade parameters, system programs using "Top-Down" designing idea are divided into some module programs in the chapter 5, At the end of this chapter, questions and resolutions in testing are introduced; In the last chapter .application of download characteristics of MCU is used on long distance update , so the totalizer can be used in broad fields if software designed reasonably .General speaking, the intelligent flow totalizer possesses a steady structure, optimized software and hardware, an excellent operating platform , high precise measuring methods , a convenient way to update and provides us a system with novelty as well as practicality.
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