【毕业设计】煤气报警器设计.doc

毕业设计(论文)
煤气警报器设计
学院: 信息科学技术学院
专业:
姓名:
指导老师:
电子科学与技术
李俊鸿
学号:
职称:
0601531003
谢海军
讲师
中国·珠海
二○一〇年五月
北京理工大学珠海学院毕业设计
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煤气报警器设计
摘要
当今社会上,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。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。通过NAP-505电化学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,发生报警信号,并把报警通道显示并储存在DS12887的RAM中,八个单元的煤气浓度对应模拟量利用A/D转换为数字量,并加入了键盘输入控制,从而实现对家用和工业煤气漏气的监控。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
Design of the coal gas’ alarm device
ABSTRACT
There are many coal gas alarm’s devices in our lives. These devices will alarm after the coal gas leaking. We call them household or industy appliances. This paper introduces the design of a coal gas alarm’s device that use the AT89S52 SCM as the most important controller. It is a ponents that control the whole programs and circuit of the coal gas alarm’ device. The appliance monitors the density of coal gas with the sensor of NAP-505 pares the current density with the setting density. We get the control signal through the dealing with the deviation signal and then sent a alarm signal that is memoried in a RAM of DS12887. The analog signal of eight densities of the coal gas are transformed into the digital signal with the A/D converter, in addition which is cotrolled with the keyboard. We can monitor the leak of coal gas in the house or industy. The hardware design of circuits is reasonable and the performance of the coal gas alarm’s device is safe and reliable.

Keywords: SCM Density Alarm’ device
目录
摘要 I
ABSTRACT II
1 前言 1
1
2
2
2 系统总体设计 3
3
3
3 硬件系统设计与传感器选用 4
4
4
6
8
电源电路 9
9
10
12
15
16
17
18
-505型电化学式传感器 19
-9半导体气体传感