1
目录
摘要 .........................................................................I
Abstract ....................................................................II
1 引言 .......................................................................3
2 设计要求....................................................................3
3 方案论证 ...................................................................3
3.1 方案论证与比较.......................................................4
3.2 核心处理模块的方案...................................................4
3.3 温度采集模块的方案 ...................................................5
3.4 控制执行的方案 .......................................................5
3.5 显示模块 ............................................................6
4 系统设计 ...................................................................6
4.1 单片机模块 ...........................................................6
4.1.1 复位电路的设计 ................................................6
4.1.2 时钟电路设计 ..................................................7
4.1.3 单片机的 I/O 口的分配 ..........................................7
4.2 LCD 1602 显示模块 ....................................................7
4.2.1 1602 接口信号说明 .............................................9
4.2.2 1602 操作时序 .................................................9
4.3 DS18B20 温度采集模块的设计 ..........................................10
4.3.1 DS18B20 的分辨率 .............................................11
4.3.2 DS18B20 工作时序图 ...........................................11
4.4 控制执行模块 ........................................................12
4.5 加热模块 ............................................................13
4.6 PID 控制算法 ........................................................13
4.7 增量式 PID 算法的参数确定............................................14
5 软件设计 ..................................................................15
5.1 主程序流程图 .......................................................15
5.2 子程序设计 ..........................................................16
5.2.1 温度采集模块子程序 ...........................................16
5.2.2 LCD 显示程序 .................................................17
6 实测结果 ..................................................................17
7 总结 ......................................................................20
参考文献 ....................................................................21
附录一：电路图 ..............................................................22
附录二：源程序 ..............................................................22
附录三：实物图 ..............................................................28
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