目录摘要............................................................................I第一章任务与要求...............................................................1L1课题背景..................................................................11.2本课题研充意义...........................................................11.3本课题的任务.............................................................21.4系统整体目标.............................................................2第二章方案论证比较与选择......................................................32.1设计方案一................................................................32.2设计方案二................................................................32.3设计方案三................................................................32.4方案的比较与选择.........................................................4第三章硬件设计.................................................................53.1温度传感器选用细则.......................................................53.2温度传感器DS18B20..............................................................................................................63.3单片机型号选择..........................................................123.4显示电路设计............................................................153.5键盘电路设计.............................................................173.6报警电路设计.............................................................183.7通信模块设计............................................................193.7.1RS-232接口简介....................................................193.7.2MAX232芯片简介..................................................203.7.3PC机与单片机的串行通信接口电路..................................21第四章软件设计...............................................................234.1软件开发工具的选择.....................................................234.2系统软件设计的一般原则.................................................244.3系统软件设计的一般步骤.................................................244.4软件实现................................................................254.4.1系统主程序流程图.......