文档介绍：目录
摘要 2
Abstract 3
第1章绪论 4
、课题研究的背景 4
、课题研究的目的 5
、国内外研究现状及发展动态 5
、研究内容 7
第2章系统总体设计 8
8
方案的选择 8
9
9
10
10
单片机选择 12
X5045看门狗及复位电路 16
18
HD7279A电路模块 20
数据采集单元 23
放大器的选择 27
DS12887实时时钟芯片及其电路 29
排气扇控制系统与切断阀 30
设计心得 33
参考文献: 35
谢辞 36
附录A:原理图 37
摘要
如今人类生活里面煤气已成为人们生活中必不可少的能源了,在越来越多的人使用煤气的同时,煤气泄漏引起的事故发生的频率也越来越高,从而给人们的人身安全和财产安全带来了很多隐患,,出现了许多煤气报警器,而这些产品大都是针对煤气的泄漏所做出的相应的报警,即为家庭式煤气报警器。随着社会的发展,煤气报警器也在发展。微机控制技术、传感器在工业控制、机电一体化、智能仪表、通信、家用电器等方面得到了广泛应用,显著提高了各种设备的技术水平和自动化程度。
本课题设计煤气报警采用了AT89S52单片机为报警器的核心部件,对煤气报警器进行控制。用单片机实现定时控制,电路简单、价格便宜、可靠性好。由一氧化碳气体传感器对煤气进行检测,将所得的浓度值与设定浓度值相比较得到偏差。通过对偏差信号的处理获得控制信号,去调节煤气出气阀的通断,八个单元的煤气浓度对应模拟量利用A/D转换为数字量,并加入了键盘输入,从而实现对家用煤气漏气的控制。整个系统的硬件电路设计合理,性能安全可靠。
关键词:单片机煤气浓度报警器
Abstract
Now the human life inside the gas has e essential to life energy, in more and more people use gas at the same time, gas leakage accidents caused by more and more is also high frequency, thus to people's personal safety and property safety brought many hidden problems, so how to prevent gas poisoning and explosion has e the urgent needs of the people. In today's society, appeared a lot of gas alarm, but these products are mostly for the coal gas leak made corresponding alarm, is a family type gas alarm. With the development of the society, gas alarm also in development. The puter control technology, the sensor in industrial control mechanical and electrical integration, intelligent instrument, communication, household appliances, etc to a wide range of applications, improved the each .
This topic design gas alarm used for alarm AT89S52 SCM core part, gas alarm to control. With the single chip puter timing control, circuit is simple, cheap, good reliability. Carbon monoxide gas by electrochemical sensors to detect gas, took the density and setting pared to get deviation. Through to the deviation