目 录
摘 要 .............................................................................................................................I
1 绪论 ..........................................................................................................................1
1.1 选题背景和意义 ...........................................................................................1
1.2 发展现状及前景 ...........................................................................................1
1.3 设计任务 .......................................................................................................2
2 系统硬件设计 ..........................................................................................................3
2.1 总体设计 .......................................................................................................3
2.2 单片机模块 ...................................................................................................4
2.2.1 单片机介绍 ........................................................................................4
2.2.2 单片机的特点 ....................................................................................5
2.2.3 单片机最小系统 ................................................................................6
2.3 传感器模块 ...................................................................................................8
2.3.1 温湿度传感器选择方案 ....................................................................8
2.3.2 DHT11 数字温湿度传感器 ................................................................9
2.3.3 传感器电路 ......................................................................................12
2.4 液晶显示模块 .............................................................................................13
2.4.1 显示器的设计方案 ..........................................................................13
2.4.2 1602 字符型液晶显示屏 ..................................................................13
2.4.3 1602LCD 电路 ..................................................................................16
2.5 报警电路模块 .............................................................................................16
2.6 按键模块 .....................................................................................................17
2.6.1 输入设计方案 ..................................................................................17
2.6.2 按键电路 ..........................................................................................18
2.7 系统电路工作原理 .....................................................................................19
3 系统软件设计 ........................................................................................................20
3.1 主程序设计 .................................................................................................20
3.2 温湿度检测控制模块设计 .........................................................................21
3.3 液晶显示模块设计 .....................................................................................22
