用Arduino自制复古指针式电压表

Radio Magazine(2015)

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Abstract
电压表大家都很熟悉了,但是在万用表的功能越来越多了以后,很多人只能在初中电学题里面才能看到那种指针式的电压表了,很多东西都是这样,物以稀为贵,我们今天就用Arduino制作一个指针式的电压表,只不过精细的表针变成了转动起来会发出"沙沙"声的舵机,看起来很像一个"会测电压的机器人".
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