酒精浓度检测仪的设计

毕业论文

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酒精浓度检测仪的设计

摘 要

本文研究设计了一种用于公共场所具有检测及超限报警功能的酒精浓度智能测试仪。其设计方案基于89C51单片机，MQ3酒精浓度传感器。系统将传感器输出信号通过A/D转换电路调理后，经由单片机进行数据处理，最后由LCD显示酒精浓度值。从而让驾车的人知道自己该在什么情况下可以开车，这是一个在现代生活很实用。

经过大量的验证，基于单片机的酒精浓度监测仪检测仪比传统的机械检测仪或酒精计灵敏，监测精度高，准确方便，可靠性好，扩展简单，控制功能强大。对超出阀值进行声光报警，直观准确。所以基于单片机的酒精浓度监测仪的研究具有一定的价值。

关键词：酒精浓度传感器；单片机；数模转换；硬件设计；数码管显示

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Alcohol concentration detector design

Abstract

This paper studies has been designed for public inspection and overrun alarm function with the alcohol concentration intelligent tester. Its design scheme based on 89C51, MQ3 alcohol concentration sensor. System will sensor output signal through the A/D circuit recuperation, data processing by MCU, finally by LCD display alcohol chroma value. So let the people know what oneself should drive in what circumstances can drive, this is a very practical in modern life.

After a great deal of verification, based on SCM alcohol concentration monitor detector than traditional mechanical detector or alcohol plans, monitoring high precision, sensitivity, good dependability, precise convenient extended simple, control powerful functions. Beyond the value of acousto-optic alarm, intuitive accurate. So based on SCM alcohol concentration monitor research has certain value.

Keywords：Alcoho concentration sensor; microcontroller; digital-to-analog;hardware design; digital pipe display

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目 录

摘 要 ...................................................................................................................... I- 2 - Abstract ........................................................................................................................ II 第1章 绪 论 .............................................................................................................. 1 1.1酒精浓度检测仪的背景 .................................................................................. 1 1.2酒精浓度检测仪现状及发展趋势 .................................................................. 1 1.3本课题实现目标 .............................................................................................. 1 1.4本章小结 .......................................................................................................... 1 第2章 设计方案和元器件选择 .................................................................................. 2 2.1设计方案 .......................................................................................................... 2 2.2元器件选择 ...................................................................................................... 2

2.2.1单片机的选择 ....................................................................................... 2

2.2.2传感器 ................................................................................................... 2 2.2.3数模转换器 ........................................................................................... 2 2.2.4 AT24C02存储器 .................................................................................. 2 2.2.5 LCD显示 .............................................................................................. 2

2.3本章小结 .......................................................................................................... 2 第3章 硬件设计 .......................................................................................................... 3 3.1硬件设计原理 .................................................................................................. 3 3.2硬件设计的外围电路 ...................................................................................... 3

3.2.1晶振电路 ............................................................................................... 3 3.2.2复位电路 ............................................................................................... 3 3.2.3报警设计 ........................................................................................ - 16 - 3.2.4电源电路 ............................................................................................... 3 3.2.5信号调制电路 ................................................................................ - 18 - 3.2.6 A/D转换设计 ....................................................................................... 3 3.2.7外围扩充存储器电路 ........................................................................... 3

3.3本章小结 .......................................................................................................... 3 第4章 系统软件的设计 .............................................................................................. 4 4.1主程序 .............................................................................................................. 4 4.2 A/D转换模块程序流程图 .............................................................................. 4 4.3液晶显示程序流程图 ...................................................................................... 4 4.4本章小结 .......................................................................................................... 4 第5章 本设计总结与展望 .......................................................................................... 5

参考文献 ........................................................................................................................ 6

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致 谢 ............................................................................................................................ 7 附录A ............................................................................................................................ 8 附录B ............................................................................................................................ 9

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