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lesson7_work3_16_
- 由上位机发送1给单片机时,蜂鸣器以400ms频率发生,2时200ms,3时100ms,4时关闭蜂鸣器-When sending a PC to the microcontroller, the frequency of occurrence of the buzzer to 400ms, 2:00 200ms, 3 时 100ms, 4 closing buzzer