基于单片机的温度控制系统毕业论文（设计）完整版.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 关键词：AT89S51单片机 DS18B20温度芯片 温度控制 串口通讯 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 录 摘要………………………………………………………………………………1 Abstract …………………………………………………………………………2 1引言……………………………………………………………………………4 2设计要求………………………………………………………………………4 3工作原理………………………………………………………………………5 4方案设计与论证………………………………………………………………6 4.1主控部分…………………………………………………………………… 6 4.2测量部分 …………………………………………………………………7 5各单元的设计 ………………………………………………………………14 5.1键盘单元……………………………………………………………………14 5.2温度控制及超温警报单元…………………………………………………16 5.3温度控制器电路……………………………………………………………17 5.4温度测试单元 ……………………………………………………………17 5.5七段数码显示单元 ………………………………………………………18 5.6接口通讯单元 ……………………………………………………………20 6电源输入单元 ………………………………………………………………21 7程序设计 ……………………………………………………………………22 7.1概述 ………………………………………………………………………22 7.2程序结构分 析……………………………………………………………23 7.3主程序 ……………………………………………………………………24 8