[EEG] low budget EEG project

Dan Brown danbrown at gmail.com
Tue Jul 13 20:18:59 PDT 2010


Tracy- that reminds me of something I saw recently about generating an
audio signal to control a servo. Not sure what setup you have in mind,
but just in case it's helpful, here it is:
http://hackaday.com/2010/05/26/sound-card-driven-servo-motor/
and when I was trying to find it just now, this also this came up in a search:
http://webcache.googleusercontent.com/search?q=cache:DKbthE-GyGcJ:www.scary-terry.com/audioservo/audioservo.htm
Dan

On Tue, Jul 13, 2010 at 7:56 PM, Tracy Jacobs <kinetical at comcast.net> wrote:
> I have a concrete goal of getting servos to move from Brainbay and EEG
> data.  Also to get the extra board hooked up in the EEG and to make
> electrode cables that work.
>
> Tracy
> On Jul 13, 2010, at 6:17 PM, Kelly wrote:
>
>> We could plan for Wed evening instead if folks want. I could be
>> there then.
>>
>> Dan, I think you're the only one with a concrete goal, and that's a
>> useful focal point for a group.
>>
>> -Kelly
>>
>> On Tue, Jul 13, 2010 at 17:18, Dan Brown <danbrown at gmail.com> wrote:
>>> Thanks for the advice and suggestions! I hope to get something built
>>> up to a state where it can be compared with existing EEG products,
>>> like OpenEEG and the Zeo sleep monitor. I'll report back to this
>>> group
>>> if/when I'm ready to test.
>>>
>>> I won't be able to make it on Sunday, but I will be there working
>>> next
>>> Tues and Wednesday in the afternoon and evening. I will attempt to
>>> get
>>> data moving through a mindflex+bluetooth into a linux laptop. Come by
>>> and say hello! And I will try to make it to one of the upcoming
>>> Sunday
>>> sessions eventually.
>>>
>>> For those that are interested in building one, too, here are the
>>> parts
>>> I will be using:
>>> mindflex http://www.walmart.com/ip/Mindflex/11004056
>>> bluetooth radio http://rovingnetworks.com/rn-41-sm.php
>>> usb dongle for bluetooth http://www.dealextreme.com/details.dx/sku.11866
>>>
>>> Dan
>>>
>>> On Tue, Jul 13, 2010 at 4:26 PM, Kelly <hurtstotouchfire at gmail.com>
>>> wrote:
>>>> Andreas is around. Looks like Sunday afternoon works for us? I'll
>>>> try
>>>> to drag Andreas. He lives across the street from me now.
>>>>
>>>> -Kelly
>>>>
>>>> On Tue, Jul 13, 2010 at 16:24, Tracy Jacobs
>>>> <kinetical at comcast.net> wrote:
>>>>> Sunday afternoon works for me, I agree it would be good to set a
>>>>> time,
>>>>> because it has been varying a lot.  Is Andreas still here?
>>>>>
>>>>> Tracy
>>>>> On Jul 13, 2010, at 3:16 PM, Vicente Malave wrote:
>>>>>
>>>>>> Hi. I am interested in meeting up on Sunday too. I also do EEG
>>>>>> for a
>>>>>> living, and I'm less interested in the hardware than in what
>>>>>> happens
>>>>>> after you record some data.
>>>>>>
>>>>>> I'm also completely unconvinced (having been a user of both) that
>>>>>> active electrodes solve a useful problem. Far more important is
>>>>>> taking
>>>>>> the time to make sure you attach the electrodes properly, obtain a
>>>>>> good electrical connection to the scalp to begin with, and
>>>>>> control or
>>>>>> shield the ambient electromagnetic fields if you can.
>>>>>>
>>>>>> Vicente Malave
>>>>>>
>>>>>>
>>>>>>
>>>>>> On Tue, Jul 13, 2010 at 2:09 PM, Robert Picone <rpicone at gmail.com>
>>>>>> wrote:
>>>>>>> On Tue, Jul 13, 2010 at 1:28 PM, Maria Mouk <mariamouk at gmail.com>
>>>>>>> wrote:
>>>>>>>>
>>>>>>>> itd be my first visit to noisebridge
>>>>>>>> so i can be there on sun
>>>>>>>> just give me a time =D
>>>>>>>>
>>>>>>>> mm
>>>>>>>
>>>>>>> I'm probably going to be hopping in the first-visit boat with you
>>>>>>> in that
>>>>>>> case, as I'm rather interested in the topic and have been meaning
>>>>>>> to show up
>>>>>>> at NB for something one of these days anyway.
>>>>>>>
>>>>>>>>
>>>>>>>>>>>> On Tue, Jul 13, 2010 at 11:20 AM, Kelly <hurtstotouchfire at gmail.com
>>>>>>>>>>>>>
>>>>>>>>>>>> wrote:
>>>>>>>>>>>>>
>>>>>>>>>>>>> Given the charts in the first link, it should be
>>>>>>>>>>>>> possible. I'm
>>>>>>>>>>>>> skeptical of their gamma, but the <35Hz data is totally
>>>>>>>>>>>>> reasonable.
>>>>>>>>>>>>> I
>>>>>>>>>>>>> think that the big win is that it's a fully packaged device
>>>>>>>>>>>>> already,
>>>>>>>>>>>>> with bluetooth/wireless built in. A lot of the hassle
>>>>>>>>>>>>> with eeg
>>>>>>>>>>>>> comes
>>>>>>>>>>>>> in just tweaking little stuff to get good contact and
>>>>>>>>>>>>> shield
>>>>>>>>>>>>> from
>>>>>>>>>>>>> noise. Do you know if the Neurosky electrodes are active? I
>>>>>>>>>>>>> have
>>>>>>>>>>>>> trouble imagining they could get that data from passive
>>>>>>>>>>>>> electrodes.
>>>>>>>>>>>>> And if they're active, that's a pretty big win, because
>>>>>>>>>>>>> active
>>>>>>>>>>>>> electrodes are a little bit of a hassle to build. It would
>>>>>>>>>>>>> probably
>>>>>>>>>>>>> be
>>>>>>>>>>>>> worth trying to hack directly into the connection and get
>>>>>>>>>>>>> the
>>>>>>>>>>>>> raw
>>>>>>>>>>>>> data
>>>>>>>>>>>>> if they're active, because then we could harvest readymade
>>>>>>>>>>>>> active
>>>>>>>>>>>>> electrodes... That sounds nice.
>>>>>>>
>>>>>>> While for the Mindflex technically has Bluetooth-band wireless is
>>>>>>> built in,
>>>>>>> nobody has yet been able to get much use out of it because by
>>>>>>> default a
>>>>>>> significant portion of the useful data is filtered out before
>>>>>>> it is
>>>>>>> reached.
>>>>>>>  The $200 standalone model does have full serial over Bluetooth
>>>>>>> built in if
>>>>>>> that's what you mean.
>>>>>>> As for the electrodes, from what I've seen it would seem that
>>>>>>> they
>>>>>>> aren't
>>>>>>> active (though what I've seen isn't hugely informative on the
>>>>>>> subject), but
>>>>>>> the amplification/analysis of the system is entirety done inches
>>>>>>> away from
>>>>>>> them anyway, so you might get some of the advantages of an active
>>>>>>> electrode
>>>>>>> system.  If you were talking about the same data I'm thinking of,
>>>>>>> it seems
>>>>>>> that they may have also been using higher quality electrodes,
>>>>>>> distinct from
>>>>>>> the ones in their actual consumer products, as a proof-of-concept
>>>>>>> for their
>>>>>>> dry electrode system.
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>>>>>>>
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