2014届毕业生毕业设计说明书题目:用于气调粮库的气体检测仪设计院系名称：专业班级：学生姓名：学号：指导教师：教师职称：教授2014年月日目录1概述............................................................................................................................................11.1国内外发展状况.......................................................................................................................11.2课题研究的意义.......................................................................................................................22系统总体方案..............................................................................................................................32.1方案选择...................................................................................................................................32.1.1传感器的选择........................................................................................................................32.1.2单片机的选择........................................................................................................................32.2系统结构框图与工作原理.......................................................................................................43系统各单元硬件设计说明..........................................................................................................53.1传感器介绍及放大电路...........................................................................................................53.1.1二氧化碳传感器....................................................................................................................53.1.2氧气传感器............................................................................................................................73.1.3磷化氢传感器........................................................................................................................93.2数据处理...................................................................................................................................93.2.1引脚介绍..............................................................................................................................103.2.2时钟电路..............................................................................................................................103.2.3复位电路..............................................................................................................................113.3光报警电路.............................................................................................................................113.4液晶显示电路.........................................................................................................................124总体软件设计............................................................................................................................144.1系统总体流程设计.................................................................................................................14结论..............................................................................................................................................19致谢..............................................................................................................................................20...
