单片机的参数放大检测系统.doc

毕业论文 单片机的参数放大检测系统 摘 要 先进行系统功能的介绍，针对该功能列出系统框图，对各个硬件部分进行元器件的选择对比后选择最佳的方案，后对开发工具软件进行介绍主要对硬件的各个部分做介绍对各个元器件做简介，介绍单片机与硬件的接口电路与各个部分使用元件的计算对软件部分的设计思路做系统概述，分块对各个部分进行讲解，画出各个部分的流程图进行详细的讲解设计以单片机ST为，信号A/D转换，：单片机；A/D转换This paper is divided into three part introduces based on single chip multi-function parameter detection system design process. The first part, first for the introduction of system function, and then according to the function list system block diagram for each part, hardware components selection, choose the best scheme comparison, finally, the software development tools are introduced; The second part, mainly to the parts of hardware is introduced and do for each components do introduction, it introduces microcontroller and hardware interface circuit and each part use element calculation; The third part, the software part of the design ideas do system overview, block to each part in the lecture, and then draw each part of the flow chart and detailed interpretation; STC89C52 system uses A single chip microcomputer as the core, including current voltage conversion module, A/D module conversion block, display module, sound and light alarm module. Software part, the data collection part, A/D conversion parts, data display part of the design. This design with the single chip microcomputer as the controller STC89C52 chip, using current voltage conversion circuit, 4-20 mA temperature, pressure, flow, liquid level signal conversion of 1-5 v dc voltage signal to A/D chip for collection. ADC0809 use as A/D conversion chip, the current voltage switching circuit converted into voltage signal as the input of the A/D, A/D output digital signal to single chip microcomputer through the CPU internal processing to implementing LCD1602 display parameters. Key words: A/D conversion; LCD1602: sound and light alarm;single chip microcomputer; Current voltage conversion; 绪 论 数据采集系统，从某种意义上来说，是用计算机控制的多路数据自动检测或循环检测的、能够对数据实行存储、处理、分析计算以及从检测的数据中提取有用的信息，并能够供显示、记录、打印功能的系统。在过去的几十年里，随着信息领域技术的发展