基于SPCE061A的酒精浓度监测论文.doc

毕业设计说明书 基于SPCE061A的酒精浓度 检测仪的设计 学 院：电气与电子工程学院 专 业：电子信息科学与技术 姓 名： 学 号： 指导教师： 2013 年 6 月 摘 要 本设计实现了对不同浓度酒精的检测和显示，通过适当改进可以用于检测酒后驾车。本文用SPCE061A单片机与MQ-3型气体传感器实现了对酒精浓度的测量，并对测量数据进行显示，同时利用二极管简单显示浓度的高低，在设计允许值时发出报警。? 论文主要研究了（1）硬件方面，MQ-3气体传感器技术参数的检测和将它接入到酒精浓度检测模块中；将模拟电压信号放大驱动发光二极管点亮报警；将采集到的模拟电压信号通过单片机控制经A/D转换，得到数字电压信号；用于显示浓度的数码管显示模块。（2）软件方面，主要研究了电压到浓度的线性转换和最终浓度值的数码管显示。（3）对设计的传感器进行了标定。设计的传感器对酒精气体反应灵敏，能在有效范围内测量它的浓度值。并且在检测低浓度酒精时误差较小，最大误差为8.2%满足设计要求。? 本文的特色在于标准的确定。对于流动空气，样品的稳定性和水蒸气的影响，提出了解决方案和验证方法。对不同的区间浓度和电压转换关系做线性化处理，简化了硬件电路的设计。设计的传感器可以检测不同浓度的酒精气体，改进之后对解决酒后驾车事故和特殊场合酒精检测都可以使用。? 关键词：气体传感器，模数转换，单片机 Abstract ? Different?concentrations?of?alcohol?solution?are?detected?and?showed?in?the?design.?The?design?can?be?used?to?the?detection?of?drunk?driving?through?improvement.?In?this?thesis,?the?concentration?of?alcohol?can?be?measured?and?displayed?by?using?the?gas?sensor?based?on?SPCE061A?MCU?and?MQ-3.?At?the?same?time?the?concentration?is?displayed?by?LED,?and?the?system?allow?to?alarm?in?the?certain?value.? ?In?the?thesis?Major?researches?are?three?points.?(1)?In?the?hardware,?detecting?the?technology?parameters?MQ-3?gas?sensor,?and?connecting?it?to?a?testing?part?of?the?alcohol?gas?concentration;?Analog?voltage?signal?amplification?to?drive?light-emitting?diode?light?to?alarm;?conversing?the?voltage?signal?through?the?A/D?conversion?at?the?control?of?the?single-chip,?obtaining?the?digital?voltage?signal;?displaying?the?concentration?in?the?digital?tube?display?module.(2)In?the??Software,?linear?conversion?between?the?concentration?of?the?alcohol?and?the?voltage?and?the?digital?display?of?the?final?concentration?value.(3)?The?designed?sensor?is?calibrated.?The?design?of?gas?sensor?is?responsive?to?the?alcohol,?can?measure?concentration?in?the?effective?range?of?its?concentration.?And?in?the?low?concentration?of?alcohol?in?the?test?the?error?is?small?with?the?maximum?error?8.2%,?meeting?requirements?of?the?design.???? ?The?characteristics?of?the?thesis?are?to