AT89S51单片机家用煤气报警控制系统设计
关键词：AT89S51；传感器；煤气报警器
Design of Control System for Household Gas Alarm
Abstract: Nowadays, there are a lot of gas alarms, however, most of these products are using PC complex to make corresponding alarm for gas leakage, they can not respond to the concentration level of different. This paper takes AT89S51 as the main chip, the main composition of MQ-7 gas sensor in the indoor gas (carbon monoxide) concentrations were detected, and relevant information will be converted to analog signal, which can be converted into electrical signal through the A/D converter and will be sent to the MCU AT89S51. Through a series of changes, the data will be showed in the seven digital tubes, after a series of operations in the MCU, the two settings were compared with the data, when it is lower than the low value of gas pipeline is normal supply. When it is between the two values, system will shutdown the valve and open the ventilation device until it is below the small value. It will close the ventilation device and open gas source at the same time if it is lower than the lower set value. When it is surpassing the high value, the sound-light alarm will warn the danger, close the valve and open the ventilation device until it is lower than the big value and higher than the small value.
Key Words: AT89S51; Sensor; Gas alarm
目 录
摘要 1
引言 2
1.研究的现状及意义 2
1.1研究的现状 2
1.2研究的意义 3
2.硬件设计 4
2.1总控制原理 4
2.2气体检测模块 5
2.3A/D转换模块 6
2.4主控模块 8
2.5显示模块 10
2.6驱动模块 11
2.7声光报警模块 12
3.软件设计 13
3.1主程序设计流程图 13
3.2 A/D转换控制程序设计流程图 14
3.3显示子程序的设计流程图 14
4.仿真结果及分析 15
5.结论 18
参考文献 19
附录 20
附录1：浓度与电压值的对应关系 20
附录2：煤气检测系统的源程序 21
致谢 25
家用煤气报警控制系统设计
引言
随着现代科技和国民经济的日益发展，人民生活水平生活质量不断提高，煤气的变革及西气东输工程的进行，使得煤气的应用越来越广泛，虽然，现在人们已经意识到安全使用煤气的重要性，但是，每年由于使用不当和设备老化导致的煤气中毒事故时有发生，因室内煤气浓度过高，引起煤气爆炸的事故也不少见。因此，煤气报警控制系统的研究日益重要，能否精确地检测出煤气的浓度直接关系到人民的人身安全及财产安全。