This paper expounds a design with Holtek microcontroller as the control core.The system adopts a power circuit system composed of a three terminal integrated voltage regulator,a photoelectric smoke sensing system,and a sound and light alarm system to construct a smoke alarm system.The key circuit diagram and system main program flowchart provided by it can achieve smoke concentration detection,sound alarm,and flashing alarm functions.The system has the characteristics of sensitive detection and stable performance.
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