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【小常识】从按钮开关看上拉pull-up电阻、下拉电阻 - CSDN博客

https://www.arduino.cn/thread-13186-1-1.html到底啥是上拉(pull-up)電阻和下拉(pull-down)電阻?在用Arduino 做實驗時, 按鈕開關(Button/Switch)是很 ...

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