2014年AT89C51火灾烟雾报警器论文【参考】.doc

摘 要 AT89C51单片机作为主控芯片，可分为主控模块、存储模块、人机对话模块(包括数码管和键盘)和无线射频通信模块。系统下位机以AT89C51系列单片机作为主控芯片，可分为主控模块、烟感探头以及无线射频通信模块。该系统具有很好的可靠性和实时性，具有广泛的市场前景。随着计算机技术和信息技术等高新技术的快速发展，无线火灾报警技术也得到迅速的推动。无线火灾报警技术的应用的 Abstract With the development of society and economy, the fire work is more and more important, but many of the current domestic research are focused on the large space fire alarm.Therefore, it is necessary to design a simple structure, economical and practical family smoke alarm to adapt to the needs of the market.The basic requirements of the smoke alarm for household use based on should have and function, this paper designs a smoke alarm is suitable for the. The design of the sensor and single-chip microcomputer as the core device smoke alarm design, with other devices can achieve sound and light alarm, automatic exhaust ventilation and fire extinguishing function.Design of single chip AT98C51 is selected as the control device, the selection of sensor for detection of MQ-2 type semiconductor gas sensitive element smoke sensor smoke.The smoke alarm is mainly composed of smoke signal acquisition and the preamplifier circuit, analog-digital conversion circuit, single-chip microcomputer control circuit, display circuit, alarm circuit and protection circuit, reasonable design, simple, low price, make full use of MCU alarm system in the control of the smoke, and has a certain practical value.The main thesis of the smoke alarm system for the various components and functions are introduced and explained, and the connection mode of the main control circuit and peripheral equipment circuit interface, and the software design of the system is analyzed and the explanation of the key. Key words: The smoke alarm MCU，Snsor AT98C51，ADC0832 目 录 1 1 1.1 课题研究的背景和意义 1 1.2 设计的概述 2 1.3 烟雾报警器在国内的现状 3 1.4 烟雾报警器现阶段的发展趋势 3 1.5 设计任务的系统分析 4 2 火灾报警系统整体方案设计 5 2.1 烟雾检测传感器的选型 5 2.2 单片机的选型 10 3 烟雾火灾报警系统的硬件电路 14 3.1 单片机的最小系统 14 3.2 单片机的时钟电路与复位电路设计 15 3.3 烟雾检测及AD采集电路 15 3.4 显示模块 16 3.5 声音报警电路 1