AT89C51单片机家用天然气检测报警系统设计+电路图+程序
毕业论文关键词：单片机；A/D转换器；报警系统
The Design of Gas Detection Alarm System Using at Home
Abstract: Aiming at China’s recent improper use of natural water and the different degree of economic lost brought by it, as well as personal injury problems, this paper study the alarm system design of adomestic natural gas detection. The system adopts the AT89C51 chip, the whole system is mainly composed of gas signal acquisition circuit, A/D conversion circuit, alarm the system consists of main circuit and circuit and microcontroller. According to the requirements of SCM,to determine whether the concentration of flammable gas is beyond the safe range is possible. If beyond the requirements of the alarm circuit, an alarm signal is generated by alarm circuit. The higher concentration of gas，the greater the sound of the alarm,playing the role of security protection. The system has the characters of fast speed , simple structure, accurate detection and easy operation so that the majority of families love and attention. The use of natural gas brought security people.
Key words:MCU; A/D converter; Alarm system
目 录
摘要 1
引言 1
1.家用天然气检测报警系统的概述及现状趋势与意义 2
1.1家用天燃气检测报警系统的概述 2
1.2 家用天燃气检测报警系统的现状 3
1.3 家用天燃气检测报警系统的发展趋势 3
1.4 家用天燃气检测报警系统研究意义 4
2.系统的整体设计 4
3.系统的硬件设计 5
3.1主控模块 5
3.2时钟和复位电路 6
3.3气体浓度检测模块 7
3.4信号转换模块 8
3.5显示模块 9
3.6报警模块 10
3.7事故处理模块 10
4.系统的软件设计 11
4.1程序流程图 11
4.2程序设计 12
5.程序的仿真与调试 13
5.1该系统最终的仿真电路如图11所示 13
5.2程序调试的步骤 13
6.总结 14
参考文献 15
附录 16
致谢 18
家用天然气检测报警系统设计
引言
随着天然气使用范围的不断增大，从工农业生产到人们日常生活的各个方面，人们直接或者间接能够接触到天然气气体的机会越来越大。因此由于各种原因，例如储存燃气的设备的老化而造成的燃气泄漏的问题而引起的经济损失和人身伤亡不计其数。人们对环境中气体浓度的检测和观察的研究不断得到重视。以前人们检测空气中气体浓度的时候，常常采用色谱法，该方法的主要优点是测量的准确度和精度比较高，其缺点是操作起来比较复杂，耗费的时间长，并且无法对有毒气体是哪种做出准确的检测。随着气体传感器的相继出现，有些人研制了一种基于单片机的检测报警装置，该装置不仅可以克服以往方法的不足，并且能精确的检测出气体的泄漏，及时发出声光警示信号，及时通风排气[1]。