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.

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Smoke detection system

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