基于单片机的火灾报警系统的设计与实现 电子与单片机专业毕业设计 毕业论文.doc

基于单片机的火灾报警系统的设计与实现 摘 要 烟雾检测报警器可避免火灾和爆炸事故以及煤气中毒的发生，它是防火、防爆和安全生产所必备的仪器，可保障生产与生活的安全，具有广阔的市场空间与发展前景。 本论文内容主要对火灾报警控制器的理论做了研究，并全面阐述了一个能实际应用的火灾报警控制器硬件部分和软件部分的方法和过程。信号送给单片机，对火灾情况进行判断，根据判定情况来Microcontroller-based fire alarm system design and implementation ABSTRCT The smoke detector alarms can prevent fires and explosions and gas poisoning occurs, it is a fire and explosion preventing equipment that necessary for safety production, and can protect the safety of production and life, and has broad market space and development prospects.  This paper mainly on the study of the theory of fire alarm control ,and make a detailed analysis and design of overall design and the various components, and a comprehensive exposition of the hardware and software components methods and processes of a practically applicational fire alarm controller. Thesis of the smoke alarm consists of smoke signal acquisition circuit and MCU control circuit.  According to design requirements, the use of environment, cost and other factors, we chose NIS-09C type semiconductor resistance smoke sensor and DS18B20 type temperature sensor. NIS-09C is a good semiconductor-sensitive devices that sensitive to CO, CO2, gas and other gas. Its sensitivity is moderate, with a good characteristics of the response and recovery, long-term stability, little impact to environmental. Signal transmitted to the microcontroller after through by the A / D conversion, and then judge of the situation of the fire. According to the judgement, MCU determines whether alarm or not, and display the relevant information at the same time. When the chroma of smoke or the temperature reached the set value levels, audible and visual alarm. As to MCU control circuit in the system design, we make full use of its high-speed data processing capabilities and a wealth of on-chip peripherals to achieve the miniaturization and intelligent of the instrumentation.  Centered with STC89S52 microcontroller and ionic NIS-09C semiconductor