I’ve been trying to make an Arduino emf because no brand makes a commercial one like a board/module. I’ve tried connecting ones that work (circuits from store bought devices) and making my own but they never seem to work despite being done correctly.

In the video linked above he says you can use an Arduino without any other components except a 3.3M ohm resistor to make a emf detector and in the video his is decently responsive! I don’t have a 3.3M ohm resistor I’m was using a 1M and and before that I was using three 1M and a 3K chained together but that didn’t works. I am now using them with shorter leads and only 3M. Also I’m using tinned copper wire for the antenna but that shouldn’t matter as I sanded it off. I’m extremely pissed because I’ve been trying to find some way to integrate an EMF sensor with an Arduino for months and all the different ways that work in videos online don’t for me. I’m powering it with a 9v battery and also tried powering it from my laptop. If I touch the bare antenna the led goes on but bringing my iPhone next to it does nothing or even the soldering iron, also I’ve tried multiple antennas. I really need help I’m not sure what the problem is. Also if there is any other way that you know of to implement a good EMF sensor with an Arduino that is compact I’m all ears. Thanks in advance.

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    You sound really angry. Most folks don’t like helping angry people. I know I don’t. It never goes well. Please edit your post and remove the profanity and talk more about the problem and less about your emotional state and you’ll probably get more help. A picture of your setup and a copy of your code would probably also be a lot more helpful than just ranting and cursing. – Delta_G Sep 29 '20 at 20:59
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    "It doesn't work" won't actually help anyone to help you analyse the problem. Tell us what you expect it to do, and what it is actually doing instead. Does the detector light stay on always? Does it never go on? If it always stays on, then it's likely that your laptop is indeed causing the interference. In such case: Try using a battery instead. If it never goes on, then there might be an antenna issue (e.g. antenna length or shape/polarisation) – Ken Van Hoeylandt Sep 29 '20 at 21:55
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    why do you believe what you see in the video? ... not everything on youtube is genuine – jsotola Sep 29 '20 at 23:01
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    Thank you for cleaning that up a little. Now that you’re a little calmer think about noise in your circuit. The one in the video had a single resistor. How was it connected? A breadboard isn’t the cleanest connection. There will be some capacitance there. Each one of those connections multiplies the amount of noise in your circuit. So using three resistors with tenuous connections isn’t quite the same thing. The idea isn’t just to recreate the circuit in theory. You have to think about how the thing works. – Delta_G Sep 30 '20 at 0:44
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    i would not put too much faith in the technical ability of a person that thinks that the antenna tip must have the insulation removed ... the antenna should be well insulated, if you plan to poke it near power outlets – jsotola Sep 30 '20 at 0:56

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