【精品】基于单片机的数字电压表--毕业论文51995.doc

摘 要 单片机是一种集成电路芯片，采用超大规模技术把具有数据处理能力(如算术运算，逻辑运算、数据传送、中断处理)的微处理器(CPU)。单片机可单独地完成现代工业控制所要求的智能化控制功能，这是单片机最大的特征。单片机控制系统能够取代以前利用复杂电子线路或数字电路构成的控制系统，可以软件控制来实现，并能够实现智能化。 关键字：电压测量换档1602液晶模块 ABSTRACT SCM is a kind of integrated circuit chip, using VLSI technology have data processing capabilities (such as arithmetic, logic operation, data transmission, interrupt processing) microprocessor (CPU).SCM can be done alone by the request of modern industrial control intelligent control function，this is the biggest feature of SCM .Single chip microcomputer control system to replace the use of complex electronic circuits or digital circuit control system, software control can be achieved, and to achieve intelligent. This paper introduces a 89S52 microcontroller as the main control device, adopts the common ADC0809 as A/D converter, a voltage measuring circuit .Mainly includes the design of hardware circuit and software program design. The hardware electric circuit mainly comprises a data acquisition module, data processing module (SCM system) and the output display module .In the data acquisition module, mostly in the voltage signal before sampling, with operational amplifier voltage amplification, after using ADC0809 conversion, will convert the received signal into the microcontroller, using 74HC4051 to realize automatic measurement .In a data processing module (SCM system), through the 89S52 single-chip A/D converted signals are processed .The display module, using LCD liquid crystal display module 1602.In software design, including initialization, interrupt, AD conversion process, gear selection procedures and display program, subroutine module. The system can realize the measurement of the DC voltage range of 0-20V, can be realized 20V files, 2V files, 200MV files shift, the use of LCD liquid crystal display measured voltage value. Keywords: Voltage measurement; automatic shift; ADC0809; 1602 LCD module 目 录 第1章 绪论 1 1.1 本设计的研究背景和研究目的 1 1.2 单片机 1 1.2.1 单片机简介 1 1.3 数字电压表 2 1.3.1 数字电