文件名称:menling
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单片机模拟简易门铃；且有关闭门铃功能。当按下HJ-3G上的S2键后，蜂鸣器会发出十次短暂的“嘟嘟”声作为呼叫。S3用于关闭或者打开门铃。
当门铃处于关闭时，按下S2不会有呼叫效果。-Simple single-chip analog doorbell and have closed door function. When you press the S2 key HJ-3G on, the buzzer emits ten times short " beep" as the call. S3 is used to close or open the door. When the door is closed, there will be no call by pressing S2 effect.
当门铃处于关闭时，按下S2不会有呼叫效果。-Simple single-chip analog doorbell and have closed door function. When you press the S2 key HJ-3G on, the buzzer emits ten times short " beep" as the call. S3 is used to close or open the door. When the door is closed, there will be no call by pressing S2 effect.
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menling.c
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