Re: Most Updated Design

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I am aware of what you want to accomplish, but I am not sure if it will
actually work well. There is reason why the OpenEEG is like that. Although
the best you can do is experiment... Try it and if it won't work, transform
it into something different. Or if you just want the EEG to work build
OpenEEG-like design. It's up to you.

2018-03-26 16:03 GMT+02:00 Houssam Eddine <[email protected]>:

> Hi Damian,
>
> 1-Yes you answered to the most important question to me so thank you (The
> question is if the design can do the aquisition (even if the signal is
> weak).
>
> 2-For the resolution I think a 12 bit A/D converter can do it (12b (4096
> values) across (0-Vdd (Vdd =3D 2-5V)  that means one step will be 0.80566=
4
> milivolt if I use 3.3 volts. (What is your opinion about that ?).
>
> 3-In this level I'm not too worried about the noise (Given the factors of
> time and cost), I'll try to use digital filtring later. For now I didn't
> expect perfect results.
>
>
> ------------------------------
> *From:* Dami=C3=A1n Filo <[email protected]>
> *Sent:* Monday, March 26, 2018 15:22
> *To:* Houssam Eddine
>
> *Subject:* Re: [Openeeg-list] Most Updated Design
>
> So I looked at what you are proposing and it won't work. Firstly the
> signal will be still too small to capture it properly, note that you are
> receiving hundreds of micro volts. This sole operational amplifier is not
> set to amplify the signal into volt level. The ATmega ADC definition is 1=
0b
> (1024 values) across 0-4V that means one step will be 3,90625 milivolt
> (0,00390625V). The signal will be still too weak. The active electrodes a=
re
> only for aqusition of the signal. The signal is sent to the analog/digita=
l
> PCB board for a reason... Your way you wouldn't have it accurate at all, =
of
> course the amplivier can do thousandfold amplification, but you won't avo=
id
> artifacts and noise... Of course it is possible to make complete EEG
> aparatus on head (view OpenBCI http://openbci.com/ ) But with OpenEEG it
> is not viable.
> As for the shielding on the electrodes, don't sweat it, I don't have
> shielding and it works, but I've got high DC noice as I've probably used
> not so appropriate contact material (silvered brass pins) and I'm not usi=
ng
> contact gel. But when measuring alpha waves while sitting still, I can ge=
t
> very good results. You can view my measurement in the documentation on pa=
ge
> 36.
> If you still don't get the idea on how to get it working, just go through
> the schematics and study some theory of what the used parts represent and
> what are they doing to the signal.
>
> I'm not sure if I answered your question completly, if so don't hesitate
> to ask further.
>
> 2018-03-25 23:40 GMT+02:00 Houssam Eddine <[email protected]>=
:
>
> Hello Tyler and Damian,
>
> I want to ask you Damian if you don't mind about this old design:
> http://uazu.net/eeg/ae.html
> I build 80% of the electrode, now Im so confused about the material of th=
e
> guarding box, and if I can use a normal battery (5v) for the amplifier.
> I want to use the analog signal (output of the TLC272) directly in an
> Analog to Degital converter.
>
> Please tell me if you have any suggestion, idea or orientation.
>
> Bests.
> ------------------------------
> *From:* Dami=C3=A1n Filo <[email protected]>
> *Sent:* Sunday, March 25, 2018 22:45
> *To:* Discussion of EEG hardware, software, training protocols, NFB
> theory - for developers and users.
> *Subject:* Re: [Openeeg-list] Most Updated Design
>
> Hello Tyler.
> As you might have noticed in recent discussions here in openeeg mailing
> list I've been designing updated version of EEG-SMT made by Olimex LTD..
> And I promised sharing it with anybody who would be interested in it. If
> you are electronic enthusiast or tinkerer, my version is what you've been
> looking for. I've taken EEG-SMT and made it modular again. Just take a lo=
ok
> at my design, which can be found here:
>
> https://mega.nz/#!JYQmgBZL!6P4nx13fcZs2gp65YZh18EGrOVqUzArJv753gL5m9bw
>
> And if you've got any other questions, just ask.
>
> Best regards,
> Dami=C3=A1n Filo.
>
> 2018-03-25 0:40 GMT+01:00 Tyler Foland <[email protected]>:
>
> Hi,
>
> I hope you are well. I am interested in building an EEG and am wondering
> what the most up-to-date design is currently. I would really appreciate a=
ny
> information you can provide!
>
> Best,
> Tyler Foland
>
> ------------------------------------------------------------
> ------------------
> Check out the vibrant tech community on one of the world's most
> engaging tech sites, Slashdot.org! http://sdm.link/slashdot
> _______________________________________________
> Openeeg-list mailing list
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/openeeg-list
> Go to the above address to change your
> subscription options, e.g unsubscribe.
>
>
>
>
> --
> Dami=C3=A1n Filo
>
>
>
>
> --
> Dami=C3=A1n Filo
>



--=20
Dami=C3=A1n Filo

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<div dir=3D"ltr">I am aware of what you want to accomplish, but I am not su=
re if it will actually work well. There is reason why the OpenEEG is like t=
hat. Although the best you can do is experiment... Try it and if it won&#39=
;t work, transform it into something different. Or if you just want the EEG=
 to work build OpenEEG-like design. It&#39;s up to you.<br><div><div class=
=3D"gmail_extra"><br><div class=3D"gmail_quote">2018-03-26 16:03 GMT+02:00 =
Houssam Eddine <span dir=3D"ltr">&lt;<a href=3D"mailto:houssem.boukhemis@ho=
tmail.com" target=3D"_blank">[email protected]</a>&gt;</span>:<=
br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left=
:1px #ccc solid;padding-left:1ex">




<div dir=3D"ltr">
<div style=3D"font-family:Calibri,Helvetica,sans-serif;font-size:12pt;color=
:rgb(0,0,0);background-color:rgb(255,255,255)">
Hi Damian,<br>
<br>
1-Yes you answered to the most important question to me so thank you (The q=
uestion is if the design can do the aquisition (even if the signal is weak)=
.<br>
<br>
2-For the resolution I think a 12 bit A/D converter can do it (12b (4096 va=
lues) across (0-Vdd (Vdd =3D 2-5V)=C2=A0 that means one step will be 0.8056=
64 milivolt if I use 3.3 volts. (What is your opinion about that ?).=C2=A0
<br>
<br>
3-In this level I&#39;m not too worried about the noise (Given the factors =
of time and cost), I&#39;ll try to use digital filtring later. For now I di=
dn&#39;t expect perfect results.<br>
<br>
<br>
</div>
<hr style=3D"display:inline-block;width:98%">
<div id=3D"m_-4993698696925378471divRplyFwdMsg" dir=3D"ltr"><font style=3D"=
font-size:11pt" face=3D"Calibri, sans-serif" color=3D"#000000"><b>From:</b>=
 Dami=C3=A1n Filo &lt;<a href=3D"mailto:[email protected]" target=3D"_blan=
k">[email protected]</a>&gt;<br>
<b>Sent:</b> Monday, March 26, 2018 15:22<br>
<b>To:</b> Houssam Eddine<div><div class=3D"h5"><br>
<b>Subject:</b> Re: [Openeeg-list] Most Updated Design</div></div></font>
<div>=C2=A0</div>
</div><div><div class=3D"h5">
<div>
<div dir=3D"ltr">
<div>
<div>So I looked at what you are proposing and it won&#39;t work. Firstly t=
he signal will be still too small to capture it properly, note that you are=
 receiving hundreds of micro volts. This sole operational amplifier is not =
set to amplify the signal into volt
 level. The ATmega ADC definition is 10b (1024 values) across 0-4V that mea=
ns one step will be 3,90625 milivolt (0,00390625V). The signal will be stil=
l too weak. The active electrodes are only for aqusition of the signal. The=
 signal is sent to the analog/digital
 PCB board for a reason... Your way you wouldn&#39;t have it accurate at al=
l, of course the amplivier can do thousandfold amplification, but you won&#=
39;t avoid artifacts and noise... Of course it is possible to make complete=
 EEG aparatus on head (view OpenBCI
<a href=3D"http://openbci.com/" target=3D"_blank">http://openbci.com/</a> )=
 But with OpenEEG it is not viable.<br>
</div>
As for the shielding on the electrodes, don&#39;t sweat it, I don&#39;t hav=
e shielding and it works, but I&#39;ve got high DC noice as I&#39;ve probab=
ly used not so appropriate contact material (silvered brass pins) and I&#39=
;m not using contact gel. But when measuring alpha waves
 while sitting still, I can get very good results. You can view my measurem=
ent in the documentation on page 36.<br>
</div>
If you still don&#39;t get the idea on how to get it working, just go throu=
gh the schematics and study some theory of what the used parts represent an=
d what are they doing to the signal.<br>
<div>
<div>
<div><br>
I&#39;m not sure if I answered your question completly, if so don&#39;t hes=
itate to ask further.<br>
</div>
</div>
</div>
</div>
<div class=3D"m_-4993698696925378471x_gmail_extra"><br>
<div class=3D"m_-4993698696925378471x_gmail_quote">2018-03-25 23:40 GMT+02:=
00 Houssam Eddine <span dir=3D"ltr">
&lt;<a href=3D"mailto:[email protected]" target=3D"_blank">hous=
[email protected]</a><wbr>&gt;</span>:<br>
<blockquote class=3D"m_-4993698696925378471x_gmail_quote" style=3D"margin:0=
 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir=3D"ltr">
<div style=3D"font-family:Calibri,Helvetica,sans-serif;font-size:12pt;color=
:rgb(0,0,0);background-color:rgb(255,255,255)">
Hello Tyler and Damian,<br>
<br>
I want to ask you Damian if you don&#39;t mind about this old design:<br>
<a href=3D"http://uazu.net/eeg/ae.html" id=3D"m_-4993698696925378471x_m_-48=
11807007422236789LPNoLP795161" target=3D"_blank">http://uazu.net/eeg/ae.htm=
l</a><br>
I build 80% of the electrode, now Im so confused about the material of the =
guarding box, and if I can use a normal battery (5v) for the amplifier.<br>
I want to use the analog signal (output of the TLC272) directly in an Analo=
g to Degital converter.<br>
<br>
Please tell me if you have any suggestion, idea or orientation.<br>
<br>
Bests.<br>
</div>
<hr style=3D"display:inline-block;width:98%">
<div id=3D"m_-4993698696925378471x_m_-4811807007422236789divRplyFwdMsg" dir=
=3D"ltr"><font style=3D"font-size:11pt" face=3D"Calibri, sans-serif" color=
=3D"#000000"><b>From:</b> Dami=C3=A1n Filo &lt;<a href=3D"mailto:nogaii34@g=
mail.com" target=3D"_blank">[email protected]</a>&gt;<br>
<b>Sent:</b> Sunday, March 25, 2018 22:45<span><br>
<b>To:</b> Discussion of EEG hardware, software, training protocols, NFB th=
eory - for developers and users.<br>
</span><b>Subject:</b> Re: [Openeeg-list] Most Updated Design</font>
<div>=C2=A0</div>
</div>
<div>
<div class=3D"m_-4993698696925378471x_h5">
<div>
<div dir=3D"ltr">
<div>Hello Tyler. <br>
</div>
<div>As you might have noticed in recent discussions here in openeeg mailin=
g list I&#39;ve been designing updated version of EEG-SMT made by Olimex LT=
D.. And I promised sharing it with anybody who would be interested in it. I=
f you are electronic enthusiast or tinkerer,
 my version is what you&#39;ve been looking for. I&#39;ve taken EEG-SMT and=
 made it modular again. Just take a look at my design, which can be found h=
ere:<br>
<br>
<a href=3D"https://mega.nz/#!JYQmgBZL!6P4nx13fcZs2gp65YZh18EGrOVqUzArJv753g=
L5m9bw" target=3D"_blank">https://mega.nz/#!JYQmgBZL!6P4<wbr>nx13fcZs2gp65Y=
Zh18EGrOVqUzArJv<wbr>753gL5m9bw</a><br>
<br>
</div>
<div>And if you&#39;ve got any other questions, just ask.<br>
<br>
</div>
<div>Best regards,<br>
</div>
<div>Dami=C3=A1n Filo.<br>
</div>
</div>
<div class=3D"m_-4993698696925378471x_m_-4811807007422236789x_gmail_extra">=
<br>
<div class=3D"m_-4993698696925378471x_m_-4811807007422236789x_gmail_quote">=
2018-03-25 0:40 GMT+01:00 Tyler Foland
<span dir=3D"ltr">&lt;<a href=3D"mailto:[email protected]" target=3D"_blank=
">[email protected]</a>&gt;</span>:<br>
<blockquote class=3D"m_-4993698696925378471x_m_-4811807007422236789x_gmail_=
quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1=
ex">
<div dir=3D"ltr">Hi,
<div><br>
</div>
<div>I hope you are well. I am interested in building an EEG and am wonderi=
ng what the most up-to-date design is currently. I would really appreciate =
any information you can provide!</div>
<div><br>
</div>
<div>Best,</div>
<div>Tyler Foland=C2=A0</div>
</div>
<br>
------------------------------<wbr>------------------------------<wbr>-----=
-------------<br>
Check out the vibrant tech community on one of the world&#39;s most<br>
engaging tech sites, Slashdot.org! <a href=3D"http://sdm.link/slashdot" rel=
=3D"noreferrer" target=3D"_blank">
http://sdm.link/slashdot</a><br>
______________________________<wbr>_________________<br>
Openeeg-list mailing list<br>
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[email protected]<wbr>.net</a><br>
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=3D"noreferrer" target=3D"_blank">https://lists.sourceforge.net/<wbr>lists/=
listinfo/openeeg-list</a><br>
Go to the above address to change your<br>
subscription options, e.g unsubscribe.<br>
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</div>
<br>
<br clear=3D"all">
<br>
-- <br>
<div class=3D"m_-4993698696925378471x_m_-4811807007422236789x_gmail_signatu=
re">Dami=C3=A1n Filo</div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
</div>
<br>
<br clear=3D"all">
<br>
-- <br>
<div class=3D"m_-4993698696925378471x_gmail_signature">Dami=C3=A1n Filo</di=
v>
</div>
</div>
</div></div></div>

</blockquote></div><br><br clear=3D"all"><br>-- <br><div class=3D"gmail_sig=
nature" data-smartmail=3D"gmail_signature">Dami=C3=A1n Filo</div>
</div></div></div>

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