change buzzer pin idle status to High voltage level (3.3v) #21
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this change will solve buzzer too heat issue
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i think add a param for buzzer pin idle status will be a better solution. |
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in original code, the buzzer is very hot.
the buzzer module schematic i used like below image, in original idle status,
self.buz.duty(0), the buzzer drive pin will be 0v in idle status, so the transistor is open, and there are current through buzzer coil, the result is that the buzzer is very hot. after change toself.buz.duty(1023), the buzzer drive pin will be 3.3v in idle status, transistor is closed, no current through buzzer coil and buzzer will be cool.