毕业设计--单片机DS18B20水温控制系统设计.doc

摘 要 本论文主要阐述了在现代化的工业生产中，电流、电压、温度、压力、流量、流速和开关量都是常用的主要被控参数。例如：在冶金工业、化工生产、电力工程、造纸行业、机械制造和食品加工等诸多领域中，人们都需要对各类加热炉、热处理炉、反应炉和锅炉中的温度进行检测和控制。采用MCS-51单片机来对温度进行控制，不仅具有控制方便、组态简单和灵活性大等优点，而且可以大幅度提高被控温度的技术指标，从而能够大大提高产品的质量和数量。因此，单片机对温度的控制问题是一个工业生产中经常会遇到的问题。希望能收到举一反三和触类旁通的效果温度的测量和控制在激光器、光纤光栅的使用及其他的工农业生产和科学研究中应用广泛。温度检测的传统方法是使用诸如热电偶、热电阻、半导体PN结之类的模拟温度传感器。信号经取样、放大后通过模数转换，再交自单片机处理。被测温度信号从温敏元件到单片机，经过众多器件，易受干扰、不易控制且精度不高。因此，本文介绍一种新型的可编程温度传感器，他能代替模拟温度传感器和信号处理电路，直接与单片机沟通，完成温度采集和数据处理。与结合实现最简温度检测系统，该系统结构简单，抗干扰能力强，适合于恶劣环境下进行现场温度测量，有广泛的应用前景。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C机串口通讯程序。 关键词：单片机 DS18B20温度芯片 温度控制 串口通讯 Abstract：The caption In the modernization of industrial production,current, voltage, temperature, pressure, flow, flow rate and switches are commonly used in the main accused of parameters. For example: in the metallurgical industry, chemical industry, power engineering, paper industry, machinery manufacturing and food processing, and many other areas, people need for various types of furnace, heat treatment furnace and boiler in the reactor and the temperature detection and control. MCS-51 microcontroller used to control thetemperature,notonly has control of convenient,simple and flexible configuration big advantages, but can substantially improve the temperature was charged with the technical indicators, which can greatly enhance the quality and quantity. Therefore,the MCU to temperature control is a problem in industrial production often encounter problems. Wish to receive the effect of giving top priority to industrial and Chuleipangtong  Temperature measurement and control in laser, fiber grating and the use of other industrial and agricultural production and the application of extensive scientific research. The temperature detection is the use of traditional methods such as thermocouple, heat resistance, such as semiconductor PN junction of the analog temperature sensors. Signal sampling, amplified