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How to hack EEG toys with arduino

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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

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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.
bryce9102 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.

rinsonnraj2 months ago

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

Fairlane2 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.
gerjimi adamsunny7 months ago
Any solution on this? I have the exact same problem. First read has all the values, but thereafter there is only 3.
Fairlane gerjimi7 months ago
I never heard back regarding this.
Matienzo5 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?
kingvicc12 months 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.
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?
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
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.
adamsunny1 year 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.
iMan12 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!
esqeezme2 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'barr2 years ago
so can re reverse this and put signals into the brain?
meztek2 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?
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