桂林电子科技大学毕业设计（论文）报告用纸 第 3 页 共 4
页
引 言 ........................................................................................................1
1 系统设计 ..............................................................................................1
1.1 设计任务................................................................................................................1
1.2 设计要求........................................................1
2 方案论证 ..............................................................................................1
2.1 系统构成方案........................................................................................................2
2.2 控制器系统方案....................................................................................................2
2.3 A/D 转换电路方案 ................................................................................................2
2.4 显示电路方案........................................................................................................3
2.5 人机交流电路方案................................................................................................3
2.6 声光报警电路方案................................................................................................4
2.7 控制电路方案........................................................................................................4
3 系统框图及主要部分介绍 ..................................................................4
4 硬件电路设计与调试 ..........................................................................4
4.1 单片机最小工作系统电路....................................................................................4
4.2 数据采集电路........................................................................................................6
4.2.1 MQ-5 简介 ............................................................................................................6
4.2.2 数据采集电路.......................................................................................................8
4.3 A/D 转换电路 ....................................................9
4.4 人机交流电路........................................................................................................9
4.5 显示电路..............................................................................................................10
4.6 声光报警电路......................................................................................................11
4.7 控制电路..............................................................................................................11
4.7.1 电磁阀控制模块.................................................................................................11
4.7.2 风扇驱动模块.....................................................................................................12
5 软件设计与调试 ................................................................................13
5.1 软件设计方法......................................................................................................13
5.2 程序流程图..........................................................................................................13
5.3 电压-浓度曲线的拟合........................................................................................15
5.4 软件部分的调试..................................................................................................20
6 测试结果 ............................................................................................20
6.1 测试仪器..............................................................................................................20
6.2 煤气控制器的测试..............................................................................................21
6.3 CO 参数测试.........................................................................................................21
