目录一、任务与要求...............................................................IIIi.i课题概述........................................................................ni1.2设计内容和功能..................................................................ni1.2.1M主要设计内容..........................................................Ill1.2.2功能.......................................................................Ill二、酒精测试仪产品设计分析....................................................42.1设计背景........................................................................42.2设计目的及意义...................................................................42.3功能要求.........................................................................42.4产品设计实施计划................................................................4三、方案设计与论证............................................................63.1总体方案框架设计分析............................................................63.1.1系统概述...................................................................63.2方案的选择与设计1..............................................................................................................................63.2.1单片机的选择...............................................................63.2.2显方案的选择.............................................................73.3方案确定.........................................................................73.4成本预算.........................................................................7四、各单元设计.................................................................94.1硬件原理设计.....................................................................94.1.2传感器模块................................................................124.1.4液晶电路模块..............................................................124.1.3A/D转换模块...............................................................134L5按键电路模块..............................................................144.1.6灯光电路模块..............................................................154.1.7