目 录
第 1 章 绪 论 ...........................................................................................................1
1.1 课题背景 .....................................................................................................1
1.2 果园大棚温湿度控制现状 ........................................................................1
1.3 本文的主要工作 ........................................................................................2
第 2 章 方案论证 .....................................................................................................3
2.1 系统的总体方案及技术指标 ....................................................................3
2.2 系统的方案论证 ........................................................................................3
第 3 章 硬件设计 .....................................................................................................6
第 3 章 硬件设计 .....................................................................................................6
3.1 温度检测电路的设计 ................................................................................6
3.1.1 温度传感器 .....................................................................................6
3.1.2 温度检测电路 .................................................................................6
3.2 湿度检测电路的设计 ................................................................................7
3.2.1 湿度传感器 .....................................................................................7
3.2.2 湿度检测电路 ...............................................................................10
3.3 主芯片的选择 ..........................................................................................11
3.4 单片机最小系统的设计 ..........................................................................13
3.4.1 MAX813L 芯片简述 .....................................................................13
3.4.2 最小系统 ........................................................................................14
3.5 键盘和显示电路 ......................................................................................15
3.5.1 显示电路 .......................................................................................15
3.5.2 键盘电路 .......................................................................................18
3.6 转换电路的设计 ......................................................................................19
3.6.1 TLC0834 芯片介绍 .......................................................................19
3.7 控制电路的设计 ......................................................................................21
3.8 电源电路的设计 ......................................................................................22
3.9 扩展电路的设计 ......................................................................................23
3.9.1 I/O 口的扩展..................................................................................23
3.9.2 数据、程序存储器的扩展 ...........................................................23
3.10 报警电路的设计 ....................................................................................24
