毕业设计基于单片机AT89C52的大棚温度控制系统PAGEIV目录TOC\o"1-3"\h\z\uHYPERLINK\l"_Toc293169406"第1章绪论PAGEREF_Toc293169406\h1HYPERLINK\l"_Toc293169407"1.1系统的概述PAGEREF_Toc293169407\h1HYPERLINK\l"_Toc293169408"1.2系统的要求PAGEREF_Toc293169408\h1HYPERLINK\l"_Toc293169409"1.3系统的主要模块PAGEREF_Toc293169409\h2HYPERLINK\l"_Toc293169410"1.3.1本系统的主要组成部分PAGEREF_Toc293169410\h2HYPERLINK\l"_Toc293169411"1.3.2各部分的功能PAGEREF_Toc293169411\h2HYPERLINK\l"_Toc293169412"1.3.3工作原理PAGEREF_Toc293169412\h2HYPERLINK\l"_Toc293169413"第2章设计的理论基础PAGEREF_Toc293169413\h3HYPERLINK\l"_Toc293169414"2.1AT89C52的工作原理PAGEREF_Toc293169414\h3HYPERLINK\l"_Toc293169415"2.1.1CPU的结构PAGEREF_Toc293169415\h3HYPERLINK\l"_Toc293169416"2.1.2CPU的结构I/O口结构PAGEREF_Toc293169416\h3HYPERLINK\l"_Toc293169417"2.1.3程序存储器PAGEREF_Toc293169417\h3HYPERLINK\l"_Toc293169418"2.1.4定时器PAGEREF_Toc293169418\h4HYPERLINK\l"_Toc293169419"2.1.5中断系统PAGEREF_Toc293169419\h4HYPERLINK\l"_Toc293169420"2.2单总线数字温度传感器DS18B20检测电路PAGEREF_Toc293169420\h5HYPERLINK\l"_Toc293169421"2.2.1DS18B20简单介绍PAGEREF_Toc293169421\h5HYPERLINK\l"_Toc293169422"2.2.2DS18B20的性能特点PAGEREF_Toc293169422\h5HYPERLINK\l"_Toc293169423"2.2.3DS18B20的测温原理PAGEREF_Toc293169423\h6HYPERLINK\l"_Toc293169424"2.3LCD1602液晶显示器PAGEREF_Toc293169424\h6HYPERLINK\l"_Toc293169425"2.3.1LCD1602简介PAGEREF_Toc293169425\h6HYPERLINK\l"_Toc293169426"2.3.21602LCD的指令说明及时序PAGEREF_Toc293169426\h7HYPERLINK\l"_Toc293169427"2.4直流马达PAGEREF_Toc293169427\h9HYPERLINK\l"_Toc293169428"2.4.1马达工作的原理PAGEREF_Toc293169428\h9HYPERLINK\l"_Toc293169429"2.4.2马达的基本构造PAGEREF_Toc293169429\h9HYPERLINK\l"_Toc293169430"2.5蜂鸣器PAGEREF_Toc293169430\h9HYPERLINK\l"_Toc293169431"第3章系统的硬件组成电路设计PAGEREF_Toc293169431\h11HYPERLINK\l"_Toc293169432"3.1系统总硬件设计PAGEREF_Toc293169432\h11HYPERLINK\l"_Toc293169433"3.2时钟电路PAGEREF_Toc293169433\h