Re: [Openeeg-list] Re. interfacing to a slot car set

[chris v. <chr...@go...>]

Kent Martin schrieb:
> Chris,
> Thanks for the extra info, I will try and set up a similar design in
> bioexplorer. I see in your design the cars seemed to run quite smoothly, and
> mine is very jerky so hopefully I can emulate what you have done in
> bioexplorer. 

maybe enlarging the averaging period will help ...
> I will forward a copy of the design to you in case anyone asks
> you for a bioxplorer version.
>   

great, thank you !
regards,
chris


>  
> -----Original Message-----
> From: chris veigl [mailto:chr...@go...] 
> Sent: Wednesday, 23 December 2009 3:56 AM
> To: Discussion of EEG hardware, software, training protocols,NFB theory -
> for developers and users.
> Subject: Re: [Openeeg-list] Re. interfacing to a slot car set
>
> Kent Martin schrieb:
>   
>> Hi Chris,
>> The hardware I used was one I designed for controlling IC engines, and it
>> also has some generic configurable control over IO pins which is what I
>>     
> used
>   
>> to control the speed. The design and code of this is far more complicated
>> than is necessary for a slot car set (10K lines of code in the micro +
>>     
> even
>   
>> more in the PC interface software).
>> That is why I wanted to look for a "quick fix" solution that would allow
>> more lay people to make and use.
>> I am very impressed with your set though. Where was the video for the slot
>> car view coming from? Was this generated or on car cam?
>>   
>>     
> no. the landscape has a servo-actuated camera that films the EEG pilots 
> and the audience.
>   
>> I am using bioexplorer so don't know if I can do anything as fancy as
>>     
> yours.
>   
>> What was the head band you were using?
>>   
>>     
> just a self-sewed elastic fabric band to hold the sintered AgCl bridge 
> electrodes in place.
> (two electrodes = one channel per person, DRL to both persons, attached 
> at hand via self-adhesive surface electrode)
>   
>> The arduino was controlled by usb, so I assume brainbay has tools to allow
>> you to send messages to other device then? I didn't find a way to do that
>>     
> in
>   
>> bioexplorer, but would be nice if it could. Better than generating and
>>     
> audio
>   
>> signal. 
>>     
>
> actually i wrote a seperate application that handles the control of the 
> racing cars, servos and does the
> multimedia stuff (live comments, little movies etc). the application 
> gets the value of the EEG band-activity from BrainBay
> via two midi channels. (it uses the freeware "MidiYoke" as an internal 
> bridge for the midi data)
> -> can be fed from BioExplorer or any other software running on the same 
> PC, or from an external midi device.
>
>   
>> Look forward to reading the docco for this system, hopefully in
>> English?
>>
>>   
>>     
> well ... - hope i will find the time to do that ...
> i think the layout for the biofeedback protocol is worth to be outlined:
> the passband activity of alpha and beta waves is calculated using 
> magnitude elements.
> these values are averaged for an epoch of about 1 second. then the alpha 
> value is divided by the beta value
> to get the control signal for the slotcar-speed (per person). using the 
> alpha/beta ratio improved the gaming expierience a lot,
> compared to using only the alpha values (because alpha waves increase 
> heavily also when you have muscle movements or other artifacts in the EEG.)
>
>
> regards,
> chris.
>
>
>
>   
>>> From: chris veigl <chris.veigl@go...> - 2009-12-20 13:09
>>> Hi Kent,
>>>
>>> great work !
>>> is there a description of the hardware parts (schematics etc.) ?
>>>
>>> i built a similar system 8 years ago ("BrainRacing") ,
>>> http://shifz.org/race/race.htm (in german only..)
>>>
>>> I found the time this year to update this system for the "long night of
>>> science" of our university
>>> (I added USB connection using Arduinos fpr the PWM/landscape control,
>>> use a Bluetooth link for EEG transmission from ModularEEG to the PC
>>> to avoid safety problems etc.)
>>>
>>> there is a special software that connects to brainbay, which displays
>>> and comments the
>>> slotcar race, and detects car-falloffs by measuring the current through
>>> the tracks.
>>>
>>> it was really fun to operate the system, we had more than 50 races this
>>> night ...
>>>
>>>
>>> see video of the system:
>>> http://www.technikum-wien.at/student_life/multimedia/videos/?full=2322
>>>
>>>
>>> if i find the time i will document the BrainRace system on a page.
>>>
>>> best regards,
>>> chris
>>>     
>>>       
>>   
>>
>>     
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