Instructables
Picture of How to hack EEG toys with arduino
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i had heard a few years back about the ability of hooking up toy EEGs so you can interface them with your computer. 

I was reminded of this for a project i wanted to do for a class (instructable coming soon ;-)), and i also found a "Star Wars force trainer" on amazon for 30 bucks. 

Here is the simple step by step instructions on how to turn a force trainer into a working EEG you can see with your computer. 

special thanks to frontier nerds for the initial code and the hack of a similar toy. 


 
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Step 2: Modding the Force Trainer

After you're done messing with the force trainer (its a pretty cool toy), open it up.

You'll be looking for two spots, the ground and a pin labeled "t". make sure the solder doesn't get on any other pins and solder two wires, one from the ground and one from the t pin.

Once that is done, drill a small hold in the force trainer case and feed the wires through. 


Step 3: Programming the arduino

Picture of Programming the arduino
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Next you want to program the arduino. This code will take the data from the force trainer and spit out some pretty numbers. We will go over what the numbers mean in a later step.

Here is the code: Arduino Brain Library

Install that library and load the serial out example, verify you are getting data from the serial monitor. 

Now you are ready to combine the arduino and the force trainer. 

Step 4: Hooking up to the arduino

Picture of Hooking up to the arduino
Next, its time to wire the arduino up to the force trainer. Take the wire from ground and wire it to GND on the ardunio, and take the "t" pin wire and plug it into pin 0 (or RX)

I used some zip ties to keep the arduino attached to the top of the force trainer.

Fantastic work, awesome processing scripts. I'm trying to write my own, slowly getting there.

karimm1yesterday

my brother is a handicap he dosn't do any thenk but he now wathe we toking about and he anderstand move his ayes pleas need help contacte me

gimail or google+: karimmariami12@gmail.com

my email : amine_1997_aout@hotmail.com

AHHHHHHHH THE BRAIN TEST ARDUINO EXAMPLE SAYS


BrainTest:9: error: 'Brain' does not name a type
BrainTest.pde: In function 'void loop()':
BrainTest:26: error: 'brain' was not declared in this scope
BrainTest:34: error: 'brain' was not declared in this scope
make sure you have the brian library declared

Hello, i am also getting the same error. did your error resolve?

kingvicc1 year ago
After browsing through the frontier nerds' post, I noticed the comparisons between the force trainer (seen in this instructable) and the mindflex. The article mentions that while the mindflex has EEG Power Band Values, the force trainer does not. What exactly does that mean? Which one would you recommend? If they're the same I'd go with the force trainer ($30 cheaper on amazon), but again I'm not really sure what the differences are in terms of features and things we can tap into. Thank you in advance! Can't wait to try this instructable out this summer!
Screen Shot 2013-04-21 at 1.27.31 AM.png
The Frontier Nerds post has some great information, but they do say you can't get full raw EEG data from the MindFlex. I have managed to do this by making some extra changes to the TGAM1 board that is inside the headset. Basically, you will see a port called B1 on the board, and there is a 10K resistor connecting this to GND. If you remove this and replace it with a 10K resistor to VCC then you get full EEG data at 57600 baud, rather than just the summary values at 9600 baud that you get normally.

Could you elaberate more on where it is? I can't find B1 for the life of me.

there's a picture here... http://darrenmothersele.com/blog/2013/10/07/mindflex-raw-eeg-data/

bryce9108 months ago

I just saw this and it looks awesome! I actually have the star wars force trainer and am going to see what I can get working.

rinsonnraj8 months ago

http://arduinoz.blogspot.com for more details on eeg robot control http://youtu.be/fDrkZbU4zX8

Fairlane3 years ago
Ok so I originally get the 11 values when I first turn on the Force Trainer headset, however then I can only get the Attention, Meditation, and Connection Status information. Interestingly, if I turn the headset on and off continuously, the Brain Serial Output (Arduino Serial Monitor) shows 11 values again and again. It seems that after the initial check only 3 values are sent. Can you confirm? here's the pic of my hardware mod.

IMG_2580.JPG

The Force Trainer, unlike the Mindflex, only outputs the 3 values, not all 11.

I'm having the same problem - I can get the Attention and Meditation values to come up in a live feed and graph, but I can't get any of the other values (brain waves) to feed in except for the initial output when I first turn on the unit.
Any solution on this? I have the exact same problem. First read has all the values, but thereafter there is only 3.
I never heard back regarding this.
Matienzo11 months ago
Hi there
I keep getting 200,0,0 as the only values and I’ve already checked the connection with other wires and it seems fine. Numbers don’t lie so I'm doing something wrong. Here is what I get from first line to the sixth:
55,0,0,89718,14644,761,1032,1341,626,645,218
29,0,0
29,0,0
200,0,0
200,0,0
200,0,0
And so on..

I’m getting the data directly from the EEG chip (pin “t”) to the RX in my arduino and also sharing the ground.
Any clue?
I've successfully made one of these before, but am having the same problem as Fairlane--the repeated monitor output is:

[0] "200"
[1] "0"
[2] "0"

Does anyone have any info on this problem? Any info would be great!
Where you able to resolve this issue? I am getting the same problem here. At the beginning I got only the 3 first readings ok but now they are showing 200, 0, 0 and I am not getting any of the other readings.
200 means there is an issue with the connection. You will not see eSense values (attention/meditation) unless you have 0 where you have 200.
danielemur1 year ago
How would this compare to other EEG devices, specifically the Neurosky Mindwave? Would the sampling rate (I think that's what it's called) be less, or would it be significantly less accurate? Lastly, could this be used to measure sleep cycles of a person?
READ the readme
leonvaldez1 year ago
"Fairlane says: Oct 24, 2011. 3:07 PMReply
Ok so I originally get the 11 values when I first turn on the Force Trainer headset, however then I can only get the Attention, Meditation, and Connection Status information. Interestingly, if I turn the headset on and off continuously, the Brain Serial Output (Arduino Serial Monitor) shows 11 values again and again. It seems that after the initial check only 3 values are sent. Can you confirm? here's the pic of my hardware mod."

I'm having the same problem and I already made my own program using the brain.cpp functions and it cant get me the values. I thought maybe I damaged the eeg chip when i was soldering it, but I just put all the pieces together and check if the toy was working properly and it was. Also, I start my own serial reading code and I'm getting serial numbers, but I just need a reference to interpret correctly the data.

I would appreciate if somebody know how to solve the problem with the original code. It would save a lot of my hobby time
leonvaldez1 year ago
Same problem here
scci1 year ago
HELP????

Hey , it says serial does not run in 64 bit mode when i try to play it, suggestions???
I could have used this 'ible about six month ago. I have the Mindflex and I ended up getting the Neurosky Mindset, which is basically a version of the Mindflex headset streamlined for getting the FFT information. At a cost of $200. Yours does pretty much the same thing. But the Mindset is wireless, which is nice :)
What do you do when you desire a different derivation of EEG than FPz to A1? Can the user plug in different electrodes to use in the Mindset? Or do they have to use that stupid arm on the forehead?
You really don't have many options. I'm not an electrical engineer, but from what I've read from those who have taken the Neurosky EEG platform (which is the basis for Mindflex and the Mindset) apart, is that they use an active electrode with onboard signal processing.

It seems to me it would be easier to build your own EEG than to try to modify the Mindset to accept multiple electrodes.

I've stuck the Mindset to other parts of my scalp, which is awkward because of the armature, and tend to just get squirrely results and poor signal.
What do you suggest for a starter to begin desiging an arduino and learning the intrinsics of the coding, which I really have a tough time with.
a truely wonderfull iable, I love it. Also I wouldn't worry about the mains shock warning. As an EE I see it is possible for it to be hazardous but not likely.

I just wouldn't use it while taking abath licking an extension chord and making toast. Geez with these safety finatics these days we will soon have to install bumbers and airbags on our kids to keep them from getting hurt by playing together..somewhere you just got to come to terms we will all eventualy get it, untill then have fun..Kudos with the proj!
How about in the rain, or when sweaty and touching a ground TV cart. C'mon, the risk of electocution is there. I got shocked by an improperly grounded hospital bed once while performing a sleep study on someone.
adamsunny2 years ago
If you check out the demo video for the Emotiv Epoc, that is probably the closest you'll come to controlling a videogame with your mind. Their demo video shows a man learning to rotate a virtual cube in various directions and making it disappear and reappear on screen. The Epoc has more sensors than the NeuroSky, but it's about three times the price (NeuroSky $100 / Epoc $300), too, and their proprietary software is extremely expensive.
morlok2 years ago
My contribution to the community, Mindflex Duel hack, 50Hz conversion, and output raw.

http://morloklabs.blogspot.com/2011/12/mindflex-duel-hacking-conversion-50hz-y.html
Ok, I'm new here - does the author reply to these, or how does one get his attention?

Being a PIC micro person myself, I was inquiring what the baud rate is - 9600, 8 data, 1 stop bit???

YAG
ThePablo692 years ago
I am going to see if I can attach this to one of those t-shirt equalizers. An EEG t-shirt haha :D
valexander22 years ago
C:\Users\Vincenzo\Documents\arduino-1.0-windows\arduino-1.0\libraries\Brain/Brain.h:14: note: Brain::Brain(const Brain&)
BrainSerialOut.cpp: In function 'void loop()':
BrainSerialOut.pde:-1: error: 'class Brain' has no member named 'update'

I keep getting this error in Arduino and I don't know what it means. Please help?

Thanks you~
seems to be a defective brain
kolp2 years ago
Help Needed: Does anyone know how to make a EEG/windows laptop interface that would allow one to record P300 brainwave "latency" (speed) and "amplitude" (power) readings using the oddball paradigm evoked potential? There are university neuro labs with big-time equipment to take such measurements. Someday maybe there will be a simple IPAD application. Thanks, guys.
would anyone feel like making me one of these? I'm trying to do some research on Binaural Beats. and would like to have a "EEG" that doesn't break my bank.
iMan13 years ago
Hi, so this is REALLY great, except that when i run the processing code, it says, ArrayIndexOutOfBoundsException: 0 in the following line of code:
serial = new Serial(this, Serial.list()[0], 9600); please help!
esqeezme3 years ago
This is my first time working with Arduino. I managed to make all connections and see lines of three number values scrolling in the serial monitor window when running serial out example. I need help getting the graphs to pop up. Step by step instructions would be great. Also, should there be more than three values displayed in the serial monitor? Thanks for a great project.
This stumped me at first, too. I realized that he means you should load that visualizing code to Processing. You can download it here: http://processing.org/ You load the code and run it much the same way as you would Arduino. Also, you'll probably have to create a sketchbook folder called "libraries" for the library (controlP5) you'll need to run it. Mine went to: /Users/*myname*/Documents/Processing/Libraries. You can see where your sketchbook folder location is by checking your preferences in Processing. Hope that helps!
Thanks for the quick response. I must be doing something wrong. I keep getting errors. I hate to ask but, can you give me an "idiot-proof" step-by-step instruction list? I understand if this is too much, I am very new to Arduino but would like to sue this set-up.
Thanks
to'barr3 years ago
so can re reverse this and put signals into the brain?
meztek3 years ago
Wow! As soon as I saw this, I simply had to give it a try. Brain wave reading is one of those things I've always wanted to do.

So I have a properly hacked headset and the graph program works on my computer. However, when I connect the headset to my computer, only attention and meditation give values. The other columns of the graph remain empty.

Any suggestions? How can I fix it?
jmellen3 years ago
I wonder if this process would work with the NEO alarm clock sensor. I bought one a while back (poor choice) and it might get higher resolution results. Assuming that more $$$ = better info but I could be wrong. The sensor is wireless but I'm guessing encrypted.
lucek3 years ago
As a note a simpler system can be made from a broken pare of headphones microphone or speaker.
How?
All you need to monitor brainwaves is a electrode. You can take the end of a broken audio jack and simply crimp a piece of metal to it to use as an electrode. It takes some testing but with this you can take junk and depending on your computer setup have a 6 input system in 30 minutes.
Umm, no. You need some serious amplification for these ranges, and your audio devices will generally filter out the waves you get, which come at anywhere from 1-50 hz. The voltages are in the microvolts.

Have you actually implemented this? I'd love to be proven wrong.
Honestly I've built an EKG using this but not an EEG I've only read about how to build an EEG like this.
frenzy (author)  lucek3 years ago
post your instructable then
yeah, how? it is eaier to bust some of these for an experiment!
I'm curious to see if you are able to train yourself to manipulate the various wave measures independently. My initial suspicion is that we only have one variable (concentrating and unconcentrating) which doesn't leave us with much. But if we can train our brains to increase/decrease alpha, gamma, theta, et al waves independently, then screw tetris we can make mind controlled quadcopters.
eecharlie3 years ago
Not to be a wet blanket, but there's a safety oversight here that is very important to be aware of. Have you noticed that every consumer EEG toy on the market is wireless? Not a single one has a cable to your computer, which might be annoying but imagine at how much higher bandwidth you could record signals from the brain. Why is this?

The GNU OpenEEG project has a fairly clear explanation and warning on this, and states unequivocally that you should never build a system that has both electrodes in contact with your head and a connection to an AC mains supply (however indirect):
http://openeeg.sourceforge.net/doc/WARNING.html
It's not only that the EEG electrodes could potentially electrocute you if you made an amazing mistake, but (much more likely) that if you happened to electrocute yourself via AC mains in some other way while wearing the EEG, then the AC current would be highly likely to travel through your brain on its way to ground via the EEG system. That would be very bad.

You'll find an abbreviated version of this warning in the hardware hack instructions by the author of the Arduino Brain Library: http://frontiernerds.com/brain-hack

A friend of mine makes an Arduino variant with built-in Zigbee communication capabilities that might be a good substitute for this application, allowing the EEG measurement circuit to be battery-powered and wireless, although I have not investigated thoroughly: http://www.logos-electro.com/zigduino/

A much quicker fix is to only use this system with a laptop (that is not plugged in).

Frenzy, I think you'd be doing a favor to the community if you added these caveats to your instructable for those who don't read all the comments.
Does any part of the main board of the computer have mains voltage?
Well, technically all of it does, just regulated.

You don't really need it wireless, you can just use an isolator (which fails open, so no electrocution) for the data line, and use batteries to power the arduino. That way nothing can happen.

But then, the whole issue is really paranoia. Just because the health risk is higher when it does fail doesn't mean it'll fail more often.
The correct answer is "No". That regulated power is DC, not AC, it is plus and minus 12 and 5 volts and nowadays I believe even regulated to 3 or less for certain components. I've had my bare hands touching the bare wires on a live board before.... and nothing happened. On top of that, you have a port that the 'EEG' goes through, which has its own safety measures, then you have to go through the arduino board. Doesn't sound like a big safety hazard to me. Quite frankly, the safety measures that most engineers want you to take in regard to communications ports is for the safety of the port and internal electronics, because they burn out faster than a light bulb on a paint mixer. Personally, from lots of experience I wouldn't worry too much about the 'safety' factor on this one. If you must, use an emitter/collector LED setup (comes in a single package) and isolate with light!

I must agree, though, there is a lot of paranoia about very many of the projects listed on this sight, thanks to a lot of dubious lawsuits on commercial products, including hot Mickey D's coffee. A simple, 'Do this at your own risk' disclaimer is sufficient. Apparently the author is still around and kicking, so I wonder what the fuss is really all about. Eh?
For commercial EEG products, they actually require a $9000 license from a test for ability for power surges to alter the connections hooked to the electrodes. Paranoia for sure, but still necessary.

An "at your own risk" wouldn't hold up too well against a dead person, or a vegetable, which is what you'd be dealing with in a bad situation.
azigta3 years ago
Please, could you report on progress with this project, updating in the instructable your progress? This is awesome!
mikeasaurus3 years ago
Rad! How long before mind controlled NES Tetris is set up?
No! Make a mind controlled pc Diablo 3!!!
SHIFT!3 years ago
Cool, the Star Wars Force Trainer is definitely one of the cooler toys out there for DIY hackers. Nice job, although I'm not sure how the transition from Graphs to "Mind Controlled Piano" would work.
chrwei SHIFT!3 years ago
math and training! my understanding is that the better, more sensitive, more expensive, brain-computer interface systems can take a few hours of training just to reliably move a mouse around the screen, and that's just "up/down/left/right". a piano would take quite some time. Also maybe you could trigger notes on mid-point values as well. I don't think you could play many recognizable songs, but it would certainly be fun and interesting
SHIFT! chrwei3 years ago
If what you're saying is true, I'm just going to lay this down now: Mind Controlled Tetris. Of course, it'd have to be a simpler controlled, custom game (no 'Hold/ Substitute' or 'Fast Drop') but you might be able to rig a simple system that only utilizes the counter+ clockwise rotations.
foobear3 years ago
Holy zomg. This is my favorite instructable ever. I really would love to try this.
splazem3 years ago
Awesome. I will definitely do this project with my new arduino kit.