AT89S52单片机进行巡回检测，当检测到火灾信号时，单片机进行声光报警，并与上位机进行通信，同时单片机驱动步进电机打开水阀，喷淋装置进行灭火。当火灾信号消失时，与上述过程相反。-AT89S52 microcontroller circuit detection, fire alarm is detected, the microcontroller for sound and light alarm, and to communicate with the host computer, while single-chip stepper motor driver open the valve, sprinklers for fire fighting. When the fire signal disappears, and the process is reversed.