1.3 酒精浓度测试仪现状及发展趋势.......................................................................................3
1.3.1 目前酒精浓度测试仪普遍缺点................................................................................3
1.3.2 酒精测试仪的应用....................................................................................................3
1.4 设计酒精浓度测试仪的意义...............................................................................................4
2 硬件电路设计与实现......................................................................................................................4
2.1 单片机开发流程...................................................................................................................4
2.2 硬件系统框图.......................................................................................................................5
2.3 气体传感器...........................................................................................................................6
2.3.1 气敏传感器的分类....................................................................................................6
2.3.2 气体传感器的选择....................................................................................................6
2.3.3 气体传感器模块电路..............................................................................................10
2.4 单片机系统.........................................................................................................................10
2.4.1 STC12C5A60S2/AD/PWM 系列单片机简介........................................................10
2.4.2 单片机的选择..........................................................................................................11
2.4.3 单片机系统电路......................................................................................................14
2.5 晶振电路.............................................................................................................................15
2.5.1 单片机晶振的应用..................................................................................................16
2.5.2 晶振模块电路..........................................................................................................16
2.6 LCD 显示电路....................................................................................................................16
2.6.1 液晶显示模块..........................................................................................................16
2.6.2 液晶屏接口电路......................................................................................................18
2.7 阀值存储系统.....................................................................................................................18
2.7.1 I2C 总线简介...........................................................................................................18
2.7.2 AT24C04 简介..........................................................................................................19
2.7.3 EEPROM 存储电路.................................................................................................20
2.8 供电及程序下载电路.........................................................................................................21
3 系统软件的设计............................................................................................................................21
3.1 编程语言的选择.................................................................................................................21
3.2 软件流程图.........................................................................................................................22
3.3 阀值读写软件设计.............................................................................................................24
3.3.1 SDA 和 SCL 信号....................................................................................................24
3.3.2 阀值的读写操作......................................................................................................25
3.4 数据转换流程图.................................................................................................................26
3.5 按键程序流程图.................................................................................................................26
3.6 液晶显示程序流程图.........................................................................................................27
4 下载与调试....................................................................................................................................28
4.1 驱动安装.............................................................................................................................28
4.2 下载程序.............................................................................................................................29
5 结论................................................................................................................................................31
6 分析和总结....................................................................................................................................34
参考文献...........................................................................................................................................35
附录 1：电路图................................................................................................................................36
附录 2：主程序................................................................................................................................37
致 谢..................................................................................................................................................42
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2014-04-11
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skul_malke2014-05-28非常好，正好用上
