温度检测与超温报警系统一 概述.........................................................................................................................................................................4二 方案设计与比较.....................................................................................................................................................42.1 控制芯片的选择.....................................................................42.2 温度采集部分.........................................................................52.3 键盘显示部分.........................................................................6三 系统的硬件设计.....................................................................................................................................................63.1 系统框图如下.........................................................................63.2 报警电路.................................................................................73.3 按键显示电路.........................................................................73.4 温度数据采集部分.................................................................83.5 电源部分:.............................................................................9四 系统工作原理.......................................................................................................................................................104.1 DS18B20 工作原理.............................................................104.2 液晶显示 LCD1602 工作原理.............................................104.3 理论分析与计算...................................................................11五 系统软件设计.......................................................................................................................................................114.1 主程序流程图:...................................................................114.2 显示流程图...........................................