单片机论文.docx

摘要
      改革开放以来,随着我国人民生活水平的日益提高,人们对于防火工作逐渐重视起来,但是由于现阶段国内的大部分防火研究工作都偏向于公共场所的火灾报警。因此,有必要开发一种方便、经济、实用的家庭火灾报警系统,以满足人们的需求。基于火灾报警的基本要求和功能,我们设计一款合适的火灾报警系统。
      火灾报警系统以STC89C51单片机为核心,温度传感器和烟雾传感器和其他设备的实时温度和可燃气体监测。烟雾传感器选用MQ-2型半导体可燃气体敏感元件,实现对空气中可燃气体的检测。温度传感器选用DS18B20型温度传感器,实现对现场温度的实时检测。当检测到的温度或者可燃气体浓度超过提前预设的阀值,立刻发出光报警并启用喷水功能灭火。
      该火灾报警系统电路设计主要由单片机控制电路、温度信号采集及前置放大电路、烟雾信号采集及前置放大电路、模数转换电路、显示电路、声光报警电路和安全保护电路构成。本文主要针对火灾报警系统中的各个模块及功能进行了详细的说明和介绍。
      
      关键字:单片机,火灾报警系统,传感器 
      
      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 , it is necessary to design a simple structure, economical and practical family smoke alarm to adapt to the needs of 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 puter as the core device smoke alarm design, with other devices can achieve sound and light alarm, automatic exhaust ventilation and fire extinguishing of single chip STC89C51 is selected as the control device, the selection of sensor for detection of MQ-2 type semiconductor gas sensitive element smoke sensor smoke alarm is posed of smoke signal acquisition and the preamplifier circuit, analog-digital conversion circuit, single-chip puter 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. 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, sensor
      
      目录
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