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 20, 2013, 8:10am 12

Two resistors of 1K attached to the analogue input. The other ends go to +5V and ground. Then the input sits at 2.5V and your capacitor attaching it to the AC source can pull it up and down from this point.

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Analog read

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