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目录
前言 ...........................................................................................................................................................1
1 方案论证与系统总体框图..............................................................................................................1
1.1 方案论证 .................................................................................................................................1
1.1.1 方案一 .........................................................................................................................1
1.1.2 方案二 .........................................................................................................................1
1.2 系统设计框图 ........................................................................................................................2
2 主要器件功能介绍 ...........................................................................................................................2
2.1 STC89C52RC 单片机..........................................................................................................3
2.2 LCD1602 显示屏 ..................................................................................................................4
2.3 DS1302 时钟芯片 .................................................................................................................6
2.3.1 DS1302 的寄存器.....................................................................................................7
2.3.2 DS1302 的读写方式................................................................................................8
2.4 温度传感器 DS18B20..........................................................................................................9
2.4.1 DS18B20 接口电路 ...............................................................................................10
2.4.2 DS18B20 工作原理 ...............................................................................................10
2.4.3 DS18B20 工作时序 ...............................................................................................13
3 硬件电路 ...........................................................................................................................................16
3.1 单片机主控制模块设计....................................................................................................16
3.2 显示模块设计......................................................................................................................18
3.3 时钟电路模块设计.............................................................................................................18
3.4 温度测量电路模块设计....................................................................................................18
3.5 报警和按键模块设计 ........................................................................................................20
3.6 系统总体硬件电路.............................................................................................................20
4 软件设计 ...........................................................................................................................................21
4.1 系统软件程序设计.............................................................................................................21
4.2 液晶显示程序......................................................................................................................22
4.3 时钟芯片程序......................................................................................................................23
4.4 温度传感器程序 .................................................................................................................24