《基于AT89S51单片机的涂层测厚系统（测量单元）》-毕业论文设计（学术).doc

摘 要 本设计以AT89S51单片机为核心的温度控制系统的工作原理和设计方法。温度信号由温度芯片DS18B20采集，并以数字信号的方式传送给单片机。文中介绍了该控制系统的硬件部分，包括：温度检测电路、温度控制电路、PC机单片机串口通讯B20温度芯片 温度控制 串口通讯Title Based on at89s51Temperature Control Systems Design Abstract This design take at89S51 monolithic integrated circuit as core temperature control systems principle of work and design method. The temperature signal by the temperature chip DS18B20 gathering, and transmits by digital signals way for the monolithic integrated circuit. In the article introduced this control systems hardware part, including: Temperature examination electric circuit, temperature-control circuit, PC machine and monolithic integrated circuit serial port communication channel and some interface circuit. The monolithic integrated circuit through carries on corresponding processing to the signal, thus realizes the temperature control goal. In the article also emphatically introduced the software design part, uses the modular structure in here, the main module includes: Nixietube display sequence, keyboard scanning and pressed key disposal procedure, temperature signal processing procedure, black-white control procedure, excess temperature warning procedure. Keywords：AT89S51 Monolithic Integrated Circuit ；DS18B20 Temperature Chip；Temperature Control；Serial Port Communication 目 次 1 引言…………………………………………………………………………………1 2 设计要求……………………………………………………………………………1 3 工作原理……………………………………………………………………………1 4 方案设计与论证……………………………………………………………………2 4.1 主控制部分 ………………………………………………………………………3 4.2 测量部分………………………………………………………………………… 3 5 各单元的设计……………………………………………………………………… 8 5.1 键盘单元……………………………………………………………………………8 5.2 温度控制及超温和超温警报单元……………………………………………… 10 5.3 温度控制器件电路……………………………………………………………………11 5.4 温度测试单元…………………………………………………………………… 11 5.5七段数码管显示单元…………………………………………………………………11 5.6 接口通讯. 测设分析温度控制系统广泛应用于社会生活的各个领域 ,如家电、汽车、材料、电力电子等 ,常用的控制电路根据应用场合和所要求的性能指标有所不同 , 在工业企业中,如何提高温度控制对象的运行性能一直以来都是控制人员和现场技术人员努力解决的问题。这类控制对象惯性大,滞后现象严重,存在很多不确定的因素,难以建立精确的数学模型,从而导致控制系统性能不佳,甚至出现控制不稳定、失控现象。传统的继电器调温电