摘要：现阶段，随着电子类产品在人们生活中的使用越来越频繁，由此引发造成的火灾也呈现上升趋势，在我们生活的周围到处都存在着火灾隐患。为了避免和减少火灾造成的人员和财产的损失，我们必须严格按照“隐患险于明火，防患胜于救灾，责任重于泰山”的理念设计并且完善火灾自动报警装置，及时发现并将火灾发现和控制在初发生阶段，尽可能地减少人民群众伤亡和财产的损失。

　　设计一种应用在各种场所的防火报警装置。将AT89S52 单片机作为主控制器, 火焰检测传感器检测热源,烟雾检测传感器MQ-2检测烟雾，并把信号传给单片机，做出火情判断，并实现火灾声光报警;利用 HC-SR501人体感应模块，对所发生火灾的空间进行检测，判断是否有人，便于救助；用PL2302实现电脑和单片机实现串口通信能进行远程监控。是一种结构简单、性能稳定、使用方便、价格低廉、智能化的报警器，具有一定实用价值。

关键词：AT89S52；火焰检测传感器；HC-SR501；烟雾传感器；上位机

ABSTRACT：At the present stage, with the frequent use of electronic products in people's daily life, the resulting fire accidents appear a rising trend; hidden dangers of fire exist around us.In order to prevent and cut the losses of human life and property, we must design and perfect the fire autoalarm on the base of such concept “Hidden danger is far more perilous than visible fire. Prevention is better than cure. Duty is more important than anything else”, detecting and bringing the fire situation under control when it is at the start stage, so as to minimize damage.

To design a fire autoalarm which can be used in various places, taking AT89S52 SCM as main controller, the flame detection sensor detect heat producer and smoke detection sensor MQ-2 do smoke detection, then transmit signals to SCM which will make judgment on the fire situation and to achieve the fire acoustoopic alarm task; Taking advantage of HC-SR501 Human Body Induction Module to detect the fire space obtaining judgment on whether there is person to rescue, use PL2302 to achieve serial communication between computer and SCM for remote monitoring. This simple structured intelligent alarm with stable function which have certain practical value is convenient to use and cheap.

Key words: AT89S52；Flame detection sensor；HC-SR501；Smoke detection sensor；Host computer