文件名称:51cuankoutongxin-fengmingqi
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由上位机发送1给单片机时，蜂鸣器以400ms频率发声，发2时以200ms频率发声，发3时以100ms频率发声，发4时关闲蜂鸣器。
-Sent by the host computer 1 to the microcontroller, the buzzer to 400ms frequency of sound, made 2 to 200ms frequency of sound, made 3 to 100ms frequency of sound, made 4 free off the buzzer.
-Sent by the host computer 1 to the microcontroller, the buzzer to 400ms frequency of sound, made 2 to 200ms frequency of sound, made 3 to 100ms frequency of sound, made 4 free off the buzzer.
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lesson7ϰ1.txt
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