hey i read and old topic for fast analog read here Arduino Forum i try this code on my arduino to get ac signal from transformer 50hz. but why i did not have the sinus graph instead square wave i get here [image] what is wrong with result?

Analog read

Grumpy_Mike April 22, 2013, 7:21am 14

Yes it is wrong the capacitor should be between the two potential dividers.

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