本文所设计的智能家居烟雾报警器采用单片机AT89C51，其价格便宜且性能稳定。本设计能将处于测试环境中的烟雾传感器输出的模拟电压通过A/D转换器送入单片机中进行处理并通过数码管显示，通过预设报警值，当检测到的烟雾浓度达到或者超过设定值时，用单片机控制发光二极管发光报警，同时喇叭工作发出声音报警，来达到监控的目的，以防事故的发生。-In this paper, the design of smart home smoke alarm using SCM AT89C51, the price is cheap and stable performance. The design of analog voltage can be output in the smoke sensor in the testing environment through the A/D converter into the microcontroller for processing and through the digital display, the preset alarm value, when the smoke concentration detected reaches or exceeds the set value, MCU control LED light alarm at the same time, the horn sound alarm, to to achieve the purpose of monitoring, to prevent the occurrence of accidents.