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Hello, I want to create a handheld electric field meter to measure the strength at a certain point with an arduino. I have seen various ideas online but I am still not sure what kind of design to use.

Is the right concept to use two antennas. Measure the voltage on each and then calculate the difference to get so many v/m? If so do I have to run a small current through the plates at a certain voltage? I am just not quite sure where to go with this.

I would like to be able to get a relatively accurate readout onto my arduino. Does the design I chose affect this or are they all the same? I really appreciate any guidance with this.

I did find a design online (using the op amp) which I tried out. I supplied it with the 5v but I got 2.7 out and had no idea whether I was actually measuring electric field or something else.

Thanks, John

Is the right concept to use two antennas. Measure the voltage on each and then calculate the difference to get so many v/m? If so do I have to run a small current through the plates at a certain voltage? I am just not quite sure where to go with this.

I would like to be able to get a relatively accurate readout onto my arduino. Does the design I chose affect this or are they all the same? I really appreciate any guidance with this.

I did find a design online (using the op amp) which I tried out. I supplied it with the 5v but I got 2.7 out and had no idea whether I was actually measuring electric field or something else.

Thanks, John