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20-Door-Bell-Designed-by-Timer
- 用定时器来设置门铃,每当按键按下的时候,单片机记录端口为低电平,导通门铃响铃电路,发出预置的铃声。-Use a timer to set the bell, when the button is pressed, the recorded port is low, conducting doorbell ringing circuit, a preset tones.
