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
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)
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. ;)
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.
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.
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.
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.
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.
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.
@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.
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).
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 ?
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.
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.
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
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.
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.
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
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.
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)
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.
@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.
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.
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
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.
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?
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 ?
@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.
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?
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...
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 😉
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.
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.
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!!
Well I did get a high measurement from my laptop it seems to not be harmful because it is produced by DC current which produces a steady continuous field that is not harmful but a field produced AC which are changing 60 times every second is what causes biological affects.
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.
Can you helm me? I try make that project whit arduino nano use that code ,it not work,bargraph high all of them, What the difference of arduino uno and arduino nano,on code side ? Arduino nano use same ship on arduino uno
Where is this guy? I miss him. He had the best videos.
***** Worst switch ever. I feel like his videos on Make were way better than on adafruit.
Awesome project. Now add 2 or 3 more antenna's to help you triangulate the direction.
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
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)
@6x6F its an arduino shield.the sheind costs nothing but spare parts.auduinos can do almost anything with programing.
What 1980's 8-bit video game soundtrack is this? Loving it! Subtle,very subtle. :)
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. ;)
My Dad went hunting and he didn't come back yet. This will help during the night.
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.
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.
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.
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.
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.
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.
Can I use it to detect ghosts?
+Amalokch GHOSTFACERS!!
We face the ghosts when the others will not.
+R haha supernatural fandom YES!!
Amalokch if it generates emf it's possible
paranormal activity emits EMF's so chances are it will work
Totally did this, fun and simple project.
very neat Collin!!!
nice project u made with the led bar graph thing.
I don't normally favourite video's but this one is worth it.
Collin is awesome!
@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.
Amazing !! Just made one!
Placed the Bar graph further away from the antenna ;)
Thanks for the circuit diagram and the Bar graph program.
Extremely cool! I need to build one of these to play around with some day
Done! Works perfectly:) thanks again Colin
you uploaded this video the day after my birthday
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).
Would this work with a 3.9M ohm resistor?
@MrEinstain i kept it clear because it looks cool looking inside
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 ?
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.
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.
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.
with a IR-sensitive phototransistor, you could probably also make a quite useful remote tester out of this :)
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
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.
it's a programmable processor circuit board that allows for multiple functions and uses.
Very interesting project
Could you tell me the lenght of the wire probe ?
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.
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
Hello. This device can detect gold and silver frecuencys ?
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
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.
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)
That is pretty cool. Also, I feel the need to mention that you kind of look like David Cross, from scary movie 2.
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.
Can it sense emf from underground?
@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.
Kipkay only does weekend projects, and he already posted one this weekend.
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.
I like the "1st person shooter" style of video
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
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.
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.
Congratulations. Nice movie, i love that project :P
Will the sensor react to a turned off car/vehicle? If so, how well?
Thank you in advance!
What is the significance of the 3.3 MOHM resistor? does it make the antenna more or less sensitive as the resistance value changes?
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?
I wanna ask something. Why did you use a screw terminal? And which type of screw terminal did you use?
Could u please text a list of all the equipment used for the Arduino EMF bar graph project?
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!!
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 ?
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
EMF goes through wire coating. So what is the purpose of stripping the wire end?
would lead shielding stop this and if so, how thick?
Awesome, really need to get a couple of arduinos...
" Ahh Mr. Powers, We Developed this new gadget for you today!"
I think the Ghost hunters should make a lot of these and leave them along the paths of residual hauntings
@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.
neat, i would like to know your results from different antenas
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..?
to measure continous fields you can use a hall effect sensor
I wonder how well this would pick up the electromagnetic disturbance of a lightning/thunder storm?
I like it!
Where can I find the code for the LED bar graph version?
@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.
Why does this guy reminds me of Lester from GTA V ?
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?
Why not using torus shaped solenoid as the receiver/sensor?
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...
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 😉
thank you so much..:)
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.
what is the biggest potential difference that can develop by using the wire?
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.
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!!
I cant wait to get my arduino uno to test this.
Well I did get a high measurement from my laptop it seems to not be harmful because it is produced by DC current which produces a steady continuous field that is not harmful but a field produced AC which are changing 60 times every second is what causes biological affects.
And that looks like something straight out of Ghostbusters
Cool stuff so you can detect a spirit !
This is Cool - please will you tell exactly what this is picking up? Hz? V/m? uT?
Very cool!
i wonder would you get a better signal from a coiled antenna instead of a single wire?
what type of proto shield is that and where can you buy one, also the wire holder for the probe, where to buy? thank you for your help.
bernardo cervantes eBay for both...just search Arduino proto and pc power
Nice!
Do you have any idea what EMF strenght each level represents?
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
The LEDS are receiving DC current from the arduino, so they SHOULD NOT be interfering with the "antennae".
Great work.......... loved it
"Do not insert into wall outlet" LOL! :)
just a thought. put a fiber optic cable between the antenna and the meter?
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.
Shorter range will isolate the source more efficiently and accurately. That's what u want.
I have heard you can capture radio frequency in the form of power. Have you heard of something like that?
@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.
Can you helm me?
I try make that project whit arduino nano use that code ,it not work,bargraph high all of them,
What the difference of arduino uno and arduino nano,on code side ?
Arduino nano use same ship on arduino uno
there is somethin' strange in the neighborhood, who you gon' call? GHOSTBUSTERS! :D:D
im looking to buy a arduino and i want o make some of these cool projects but i dont wnt to spend alot .which arduino should i buy