目 录 1 前 言 ....................................................................................................................................1 2功 能 描 述 与总 体 方 案 …....................................................................................................2 2.1 功 能 描 述 ..................................................................................................................2 2.2 系 统 组 成 ....................................................................................................................2 3 硬 件 设 计 .............................................................................................................................3 3.1 时 钟 电 路 ......................................................................................................................3 3.2 复 位 电 路 ......................................................................................................................3 3.3 DS1302 时 钟 电 路 .......................................................................................................4 3.4 DS18B20 温 度 计 电 路 .................................................................................................4 3.5 按 键 电 路 ....................................................................................................................5 3.6 显 示 电 路 .....................................................................................................................6 3.7 闹 铃 模 块 电 路 .............................................................................................................7 4 软 件 设 计 .............................................................................................................................8 4.1 主 函 数 流 程 图 ............................................................................................................8 4.2 18B20 温 ...
