Recent content by kriscpm

Will it help more if i use a LM193 Comparator? I have corrected my schematic where i put a ground on V- instead of -5V. With this, there will not be anymore negative voltage. Does this help to avoid my Arduino from being damaged?

If i convert the AC signal to a square wave, then i can use Arduino to capture the rising pulse in order to count the frequency. Is this way correct and accurate? I have run the simulation and the result is as attached. Please correct me if I'm wrong.

Hi all, I would like to ask for suggestions on how to measure the frequency from my main supply which is 240V? As i know the frequency varies very little, hence i would like to measure it as accurate as possible. The reason for this is because I'm doing a smart meter project with Arduino...