Arduino EMF detector

[@ch0c4]

Where is this guy? I miss him. He had the best videos.

[@JakeDancel]

***** Worst switch ever. I feel like his videos on Make were way better than on adafruit.

[@therevoman]

Awesome project. Now add 2 or 3 more antenna's to help you triangulate the direction.

[@elootz1895]

What 1980's 8-bit video game soundtrack is this? Loving it! Subtle,very subtle. :)

[@JerryEricsson]

I love this setup, however I was having problems with the sketch. I finally discovered the problem "index" was being used in the code, however an upgrade to the ARDUINO programming software declared index as a reserved word. I used the replace and find option on the ARDUINO software to change the name 'index' to 'dindex' and it all came together. Of course you can choose any non reserved word and the problems end! I hope this will solve problems for anyone trying to use this old code to build one of these. I realize this is a very old video but it is still relevant to today's needs.

[@Rendogfan27]

My Dad went hunting and he didn't come back yet. This will help during the night.

[@wmcneal42]

Kinda cool with the bar graph. You can buy a similar device at any Home depot or Lowes in the electrical dept. Electrcians call it a "tick tracer". It does not have a bar graph though. It just makes a chirping sound when it gets near an alternating EM field.

[@greywolf271]

Having learnt programming on a Synertek Sym-1 SBC in the '80s, I can assure anyone new to embedded programming that Arduino is a whole lot more fun and easier to program. Also, look up Pachube (or Cosm)

[@tche68]

Nice idea yours. Try add some sort of amplifier, with a really high sensivity like a FET, and then we will be talking about detection! And why not give some sound feedback to it? It may be the first digital theremin ever made

[@synapticaxon9303]

Wire moving all around, would be interested to see it more solid. I built one of those mosfet-enabled electrostatic polarity detectors. How does this do with static fields? I noticed that my "antenna probe" was actually being pulled towards the static charge, and using it near my Wimshurst machine once, it attracted a spark and fried the mosfet. Good thing I ordered 50 of them. ;)

[@fourthlifeproduction]

@6x6F its an arduino shield.the sheind costs nothing but spare parts.auduinos can do almost anything with programing.

[@arthurthegreat216]

Cont'd: So the M.F is oscillating at the frequency of the AC current. Also, even if it were DC, the guy is still moving around as he tests possible sources, which creates changes in magnetic flux even if the field itself is constant (again, Faraday's law), which in turn induces an emf in the probe. An electric field will also induce a current in this probe since the charges in the probe are free to move (unlike on a capacitor for example) and since it'll move charges, it'll induce a M.F too.

[@RadioEnhancedBear]

cool project! as an electrical technician i'm certainly gonna have to make one of these, with a bit of tweaking it would be an excellent transformer tester.

[@tmdrake]

They would share the same current so brightness would be affected the more LED's turned on at the same time (unless the sketch is updated so that only one LED is turned on at a time). Using one resister would mean all LED's share the same current limitation provided by that one resister.

[@mike060187]

nice project u made with the led bar graph thing.

[@Jonnysea1986]

Also each LED is connecting to its own output pin so each LED can be controlled individually, if you tried what you are suggesting every time one pin goes high all of the LED would see the voltage.

[@wtforkdrums]

with a IR-sensitive phototransistor, you could probably also make a quite useful remote tester out of this :)

[@fourthlifeproduction]

@TheMagicalTouch no, when an EMP goes off it gives off EMP waves, and if an EMP went off aroud this toy, the leds would get so hot, they would melt the pcb.an EMP is a pulse of an EMF.

[@JerryEricsson]

Extremely cool! I need to build one of these to play around with some day

[@PhysicsOfParkour]

Amazing !! Just made one! Placed the Bar graph further away from the antenna ;) Thanks for the circuit diagram and the Bar graph program.

[@NvPGulstab]

Kipkay only does weekend projects, and he already posted one this weekend.

[@kevinaldrichFL]

Your sketch link no longer works. Can I please get a link to the sketch, I'm trying to figure out how the multi-led works. Thanks.

[@Amalokch]

Can I use it to detect ghosts?

[@Ripaltico]

+Amalokch GHOSTFACERS!!

[@liamels6282]

We face the ghosts when the others will not.

[@Darth_JarJar1967]

+R haha supernatural fandom YES!!

[@jacobmissbrenner5429]

Amalokch if it generates emf it's possible

[@KingNothing22]

paranormal activity emits EMF's so chances are it will work

[@pistolpeteski]

Are you referring to merely a meter such as the one in this video? If so, that is only indicating that there is a field with the intensity increasing as it moves closer to the source. This is the same exact thing as a voltage sensor for $12.97 at Home Depot. Go check it out. If you need a more accurate measurement such as direction of magnetic field and specific intensity then you are talking about a different animal with the Gauss.

[@Techmatt167Official]

@MrEinstain i kept it clear because it looks cool looking inside

[@MrThomasdm]

praps by using a shielded bit of cable for the probe and then space that block a bit and cover in anti static stuff. would be the budget way to go

[@EDH83]

That is pretty cool. Also, I feel the need to mention that you kind of look like David Cross, from scary movie 2.

[@ELMAESTROTARASCO]

Hello. This device can detect gold and silver frecuencys ?

[@cldream]

it's a programmable processor circuit board that allows for multiple functions and uses.

[@snaprollinpitts]

very neat Collin!!!

[@tmdrake]

I own dozens of K2 and several Gause Meter. The answer is maybe, but its not calibrated. Both K2 and Gauss Meter used a pickup coil & amplifier and some Low frequency filtering. The only filtering this has is the input capacitance of the MCU's IO lines, which is a good amount seeing that they are FET's (hence almost no loading and needing that 2.2Mohm resister to drive it back to ground).

[@crionro]

Totally did this, fun and simple project.

[@kd1s]

I don't know. Easiest test is to build an RF quite box and test in there. I bet you'll see the level drop to zero. But I doubt you're getting internal noise. My DMM can sense RF current in the air too. I've noticed if I put it in voltage sense mode I get a wild display of numbers.

[@Forewarned76]

I think the Ghost hunters should make a lot of these and leave them along the paths of residual hauntings

[@antonioperezsaavedra7423]

Very interesting project Could you tell me the lenght of the wire probe ?

[@Techmatt167Official]

you uploaded this video the day after my birthday

[@compgeek]

You could, but with a current limit applied to the total of all the LED elements, as more light up (draw current), the current available to each element decreases, meaning more lit up = less brightness each

[@LouisNaber]

Would this work with a 3.9M ohm resistor?

[@diglo]

There is a backgound mistake: a monopole antenna like the one you made with that wire does NOT pick the EM field in the direction of the wire, but orthogonally! Its radiation patter is something like a donut around the wire... (telecomm engineer)

[@xzerobit]

As far as I understand, the only thing that should be affecting the "antennae", which in this case is just a wire, should be EM waves. I dont think static magnetic fields should have any effect on an antennae.

[@uvman707]

Consider adding a speaker. Would be very interesting to hear what it's picking up. I built one without Arduino and it is very sensitive. Picks up EMF and RF.

[@vgbhg9540]

Can it sense emf from underground?

[@3hornthrasher815]

That's some boss tool, I wonder how much that will cost if you sold it.They have volt detectors, but the good ones are like $30.00, and you can make it into a box, so it would be worth less from how bulky, but its so cool

[@kriptonis]

@gandulfo77 Since the basic energy type is electromagnetic, and there is no magnetic energy other than electromagnetic, then this is in fact an Electromagnetic field detector. It might detect only some electromagnetic fields, but the uploaded didn't spoke about it's sensitivity. Of course if the field is too low it will not detect it. But it's still an electromagnetic field detector. All electromagnetic energy is the same, magnets, wires or electromagnets.

[@tigrouind3813]

Very interesting project. What make the wire so sensitive? Is it because of the pull-down resistor or because the arduino internally amplify signal received on the input pin ? Is it sensible enough to detect wires behind the walls ?

[@theintelarif]

Its the electromagnetic induction that creates a very small voltage across the resistor. And arduino's analog pin reads that voltage and shows the LED bar accordingly. And Arduino Uno has a 10-bit ADC, so it can't measure voltage less than 4.8mV. You can try detecting wires behind walls. If the current through the wire is high enough, you might be able to detect that.

[@DarcyWhyte]

I like the "1st person shooter" style of video

[@darepunk999]

Can some please post all parts needed to build this including batteries and what kind and its build , wires , cable the case used and other stuff like a really really detailed list Please?

[@mikemackenziegrieve]

neat, i would like to know your results from different antenas

[@tmdrake]

We do it buffer-less all the time...its not like your driving an inductive load or heavy resistive load. Atmega can easy do 20ma (possibly 40)...but LEDs would light up as easy as 1mA depending on resister selection (if you are really concerned). the Atmega used in this project is probably

[@WooWhoWho]

An Uno or Leonardo. The Leonardo is the latest and slightly cheaper but you need a USB cable with a micro plug while for the Uno you need a B plug like a printer cable which you might already have. Also the Uno micro-contoler is replaceable if you damage it.

[@shodanxx]

fluoride lamp ? also EMF isn't dangerous to have in a laptop so it isn't a good or bad thing, health wise (except if you mean that it's a good thing because low emf = low battery usage !) bargraph isn't going to generate any EMF that can be picked up by your probe , its eletro-magnetic field far weaker than the inductive loads of the fluorescent lamp (like 100 dB at least) or the dremel's motor what's that shield's name ? it looks great !!! keep posting, it's great ,I'm going to try this now

[@PureCarbon]

Collin is awesome!

[@gabrielinfante]

to measure continous fields you can use a hall effect sensor

[@1337Bez]

i wonder would you get a better signal from a coiled antenna instead of a single wire?

[@Crixe]

Ghost Busters own-ages, Add those little antenna. Could probably find the toy that was made to look like it package this into that and you'd have a real EMF machine.

[@antonnpn9063]

Done! Works perfectly:) thanks again Colin

[@goldeneye007662]

And that looks like something straight out of Ghostbusters

[@DudeInAMotorhome]

I wonder how well this would pick up the electromagnetic disturbance of a lightning/thunder storm?

[@MadmanDKDK]

I really doesn't know much about Arduino programming, only web programming. My question is, as a programmer, would it be possible to program the LED bars, to show bars according to how much current or whatever type of electricity is detected with the probe wire ?

[@TheNoPig]

you can also use a AM radio on band 3

[@northstarmohican]

Maybe add a second probe and set of LED's. Then add a number screen to display the difference between them. The device could be used to guesstimate current strength of two areas. Helpful when looking for shorts or other problems.

[@Ericspasstime]

I have heard you can capture radio frequency in the form of power. Have you heard of something like that?

[@DevilMaster]

Could you use 3 "wire probes" (one pointing 45° to the left, one pointing straight ahead, one pointing 54° to the right) to get 3 readings, to have a better understanding of the spatial layout of the EMF? And could you use an LCD to display the obtained data as bars *and* numbers?

[@MatrixOfDynamism]

what is the biggest potential difference that can develop by using the wire?

[@videofan88]

do all Arduino's come with a proto shield under them and if not were can i get one and how do you install it

[@UnderMan]

could you use a wire coil instead of an antenna? After all, you are detecting the magnetic flux, which induces a current in the wire.

[@electromagneticprojects1253]

Hello; I built an Arduino EMF Detector but i have a problem. The values on the EMF screen are unitless. I see huge numbers like 500.000 , 200.000, 300.000 when an electromagnetic field occurs. Also there is always a constant value just about 50.30, 49.32, etc. 1)I want to see the values as frequency. How can i convert it to the frequency? Is it possible? If it is, could you help me? 2)I use a copper cable as antenna. What is the reason of constant value? Is it because of antenna or because of crircle? Thank you...

[@theintelarif]

Electromagnetic Projects Those huge numbers are ADC values. You have to convert them to analog voltage. For example: 500*(5/1023)= 2.44V And the constant value is most probably caused by random noises, which may come from radio waves, or even from your home AC power supply 😉

[@electromagneticprojects1253]

thank you so much..:)

[@hockeycrazy165]

I don't normally favourite video's but this one is worth it.

[@nemesisdog2]

no its just that pin 12 has a built in resistor none of the others do. PS never put a wire from the 5v pin to the gnd pin

[@venomgaming3569]

Could u please text a list of all the equipment used for the Arduino EMF bar graph project?

[@EnergeticWaves]

would lead shielding stop this and if so, how thick?

[@cyaxeres]

what kind of arduino should we use to get it? How can i explain it to radio shack to buy it? Any model, serial number, or else..?

[@MeneGR]

Don't know if it's inappropriate or something, but I will just say it. I just saw Collin on a video about Adafruit's Circuit Playground, here on youtube!!

[@arthurthegreat216]

EM fields, not waves. Anything that can induce a current in the probe. Throughout the vid he points it at an outlet and a drill and gets a reading. Surely there is no EM radiation coming from the outlet and drill. The current in the connected cords to the outlet induce a current in the 'probe' (Faraday's law) which lights up the LED. Also, the magnetic field in these cases is not static since it's probably AC current in the outlets.

[@russotragik]

you can detect ghosts?

[@makyoch]

@gandulfo77 yea, its probably EMF, depending on the use. if you mean for "ghost hunting" then this is not the right thing to be using.

[@besteceltek3842]

I wanna ask something. Why did you use a screw terminal? And which type of screw terminal did you use?

[@toougly2]

" Ahh Mr. Powers, We Developed this new gadget for you today!"

[@rushoffman965]

I remember when this was first uploaded..

[@marcovalentinoalvarado3290]

Why does this guy reminds me of Lester from GTA V ?

[@daniellaguerrero9131]

thats really cool. Could you help me with how to program it?

[@Kitver0]

@KC2VDM You can't find any 3.3m. At least i can't. Using a color chart people are saying that he uses 3.3k. Haven't checked myself though.

[@AbilayKu]

Will the sensor react to a turned off car/vehicle? If so, how well? Thank you in advance!

[@mikkelhougs]

It makes sense if EMF stands for Electromotive Force rather than the Electomagnetic field.

[@pashzot]

I like it! Where can I find the code for the LED bar graph version?

[@mister35mmuk]

I am trying to find a decent Arduino metal detector project. Nothing decent found so far. I'd really like a kit as I am lazy, and hate wasting time hunting around for parts.

[@arthurthegreat216]

?? The weak current still produces a magnetic field in its surroundings and there is a weak electric field from the charges themselves as well. What he said is very possible.

[@GameOfThePlanets]

just a thought. put a fiber optic cable between the antenna and the meter?

[@exproducermichael]

GameOfThePlanets Shielding would work better and effectively cost less than the expensive opto-electric converters. All he needs to do is put some tinfoil over everything that isn't the antenna and then connect it to ground.

[@peterluxus7382]

I used a small 2,2" TFT Display for this.

[@suupertramp]

does this only work with AC? or am i making a hugh mistake?

[@Londrino]

he suspects he's getting feedback from the LEDs? do LEDs create a lot of emf?

[@ericdelarosa2184]

What is the significance of the 3.3 MOHM resistor? does it make the antenna more or less sensitive as the resistance value changes?

[@AnnaVahtera]

Search ebay for "iduino nano". Got "everything" that the full-blown Arduino has, but in a smaller package and costs around $9, including shipping.

[@CrossEyedLarry]

its a little microcontroller, sort of like a computer that you can mod for different projects

[@NicolasTsagarides]

@TechnoMaple Just use a 0.125m long antenna

[@MyBigThing2010]

WTF? the sketch link is removed from the website! anyone have the sketch that they can paste as a reply here? Thanks!

[@shamleekshirsagar4483]

We can read frequency of these waves, using LCD, can you upload a video of the circuit? It'd be really kind of you. Thank you!!

[@dylanpdx]

Does anybody know how much a LED bar graph costs? Or if it's in Radio shack?

[@buzzwerd8093]

Why do you strip the end of the probe wire? The insulation is not going to make a difference unless the probe touches something it shouldn't, in which case you're screwed. You're just begging for a Murphy there. Also why not use a loop or coil and get some directionality?

[@irgski]

you could add an amplifier and place the electronics in a metal (shielded) box.

[@StevenAtkinson1988]

"Do not insert into wall outlet" LOL! :)

[@thegoodhen]

@matthewtchernev123 Not really that hard. There is just a problem with switch. I reccomend using magnetic switch and magnetic bracelet mounted on bottle. That way it'll be 100% waterproof.