本科生毕业设计（论文）I摘 要温度是一种最基本的环境参数，人们的生活与环境的温度息息相关，工业生产过程需要实时测量和控制温度，农业生产也离不开温度的测量，因此研究温度的测量和控制方法和装置具有重要意义。测量温度的关键是温度传感器，温度传感器的发展经历了三个发展阶段：传统的分立式温度传感器。模拟集成温度传感器。智能集成温度传感器。目前，国际上新型温度传感器正从模拟式向数字式，从集成化向智能化，网络化的方向飞速发展。本文介绍了以 AVR 单片机核智能数字温度传感器 DS18B20 为核心设计的一种多功能热水控制器，通过 AT90S8518 单片机及软件编程，具有自动和手动加水、设置水温、实时显示水量及温度，漏电报警功能。目前，能源紧张和全球气候变暖使绿色节能产品已成为当今社会热点，家用太阳能热水器也随之兴起，本文所设计的控制器具有性价比高、工作可靠、精度高等特点，为太阳能热水器的进一步推广使用起到了一定推动作用。关键词：AVR；DS18B20；数字温度传感器；太阳能本科生毕业设计（论文）IIAbstractThe temperature is one kind of the most basic environment senate, peoples livelihood and the environment temperature is closely related, the industrial production process needs the real-time measurement and the control temperature, the agricultural production also cannot leave the temperature surveying. Therefore the research temperature survey and the control method and the equipment have the vital significance. The survey tempter and the control method and the equipment have the vital significance. The temperature sensor development has experienced there development phases: Traditional minute vertical temperature sensor. Simulation integration temperature sensor. Intelligent integration temperature sensory. At present, on international new temperature sensor from simulation type to digital, from the integration to intellectualized, the network direction rapidly develops from simulation type to digital, from the intergradations to intellectualized, the network direction rapidly develop.This article introduced take the AVR single-chip microcomputer and intelligent numeral temperature sensor DS18B20 as the core design one kind of multi-purpose hot water controller. Pass the AT90S8518 single-chip microcomputer and software programming, have auto and hand operation to fill with water, establish water temperature, real-time shows amount of water and temperature, the electric leakage reports to the police a function.Currently, energy crisis and global warming to green energy-saving products have become hot spots in todays society, home solar water heaters also will rise, the paper designed by the controller has cost-effective, reliable, high precision, for solar water heaters further promote the use played a certain role.KeyKey wordswords: AVR; DS18B20; 1-WireTM Digital Thermometer; Solar本科生毕业设计（论文）III目录第 1 章 绪论.11.1 引言.11.2 设计意义.1第 2 章 系统总体方案的设计.32.1 系统总体方案的设计.32.2 工作原理.42.3 器件选择.4第 3 章 单元电路设计及工作原理.53.1 传感器简述.53.1.1 温度传感器发展史.53.1.2 温度传感器分类.53.1.3 DS18B20 工作原理简介.73.1.4 DS18B20 具体参数及工作方式.93.1.5 光电液位传感器原理参数及应用.113.2 漏电保护器工作原理及应用.143.2.1 漏电保护器简述.143.2.2 漏电保护器工作原理.143.2.3 漏电保护器电路与单片机连接.153.3 时钟芯片介绍.153.3.1 DS1302 管脚名称及功能.153.3.2 时钟芯片 DS1302 与单片机连接.163.4 AT90S8515 单片机管脚定义及参数.163.4.1 AT90S8615 简介.