目录1 绪论.............................................................................................................................31.1 研究背景与意义..................................................................................................31.2 国内外研究现状..................................................................................................31.2.1 国外研究现状...............................................................................................31.2.2 国内研究现状...............................................................................................42 总体方案设计.............................................................................................................52.1 系统设计思想......................................................................................................52.2 单片机的论证与选型..........................................................................................52.3 显示模块设计与论证..........................................................................................62.4 传感器选型..........................................................................................................62.4.1 CO 传感器....................................................................................................62.4.2 PM2.5 传感器设计.......................................................................................72.4.3 甲醛传感器设计...........................................................................................83 硬件系统设计.............................................................................................................93.1 系统总体设计......................................................................................................93.2 控制模块设计....................................................................................................113.2.1 单片机引脚介绍..........................................................................
