Re: OpenEEG Questions

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You're really knowledgable about this Damian!  How do you work around the
challenges with multiple leads, will each lead require it's own circuit?

Thanks,
Steve

On Sun, Sep 20, 2020, 1:17 PM Dami=C3=A1n Filo <[email protected]> wrote:

> I am sorry for the spam, but in my previous e-mail I said: "any of those
> changes you proposed are possible" - that is false. One change you
> mentioned was to feed raw data onto GPIO pins of RPi. That will not work,
> because what you need to do with the signal is to convert it from analog =
to
> digital data through ADC and RPi doesn't have an ADCs. You can avoid usin=
g
> ATmega microcontrollers, but you still would have to use some external ch=
ip
> with ADC functions. And then you would have to program your own firmware
> and protocol, so you can use the data in applications running on RPi.
> Though what you can do with RPi is to feed the data directly from ATmega
> through native UART interface on RPi without the need for USB-UART chip.
> But about that, I am not really sure about the signalling voltage mismatc=
h
> 5V/3.3V. So it is still preferred to use a USB interface with UART bridge
> like CP2102.
>
> S pozdravom,
> Dami=C3=A1n Filo
>
>
> so 5. 9. 2020 o 21:49 Yonah Elorza <[email protected]> nap=C3=ADsal(a):
>
>> Hello!
>>
>> I'm a computer engineer interested in making some modifications to the
>> OpenEEG circuit, and had a few questions, if anyone is available to answ=
er
>> them. I've read through all the documentation on the website, and have
>> worked with the OpenEEG platform for a few years now, and wanted to see =
if
>> the following was possible:
>>
>> -Designing better noise cancelling to reduce commons noise, as well as
>> noise between electrodes.
>> -Integrating an FPGA into the design which acts as a hardware Fast
>> Fourier Transform
>> -Making the circuit modular enough that you can stack multiple together
>> to have 4, 8, 16, etc. electrodes reading at the same time.
>> -Long term: modifying the design of the circuit to work without the AT
>> processor, instead having hardware control from the GPIO of a Raspberry =
Pi,
>> and all data being fed raw to either the GPIO or USB interface of the Pi=
.
>>
>> If anyone has reasons this wouldn't be possible, or if you have
>> suggestions for any of these changes, please let me know. I absolutely l=
ove
>> this project, and would love to be able to contribute my own work to it.
>>
>> --
>> Best Regards,
>> Yonah Elorza
>> Columbia School of Engineering | Class of 2018
>> Computer Engineering
>> Tel: ( <%28786%29%20205%20-%204304>305)-542-1735
>> _______________________________________________
>> 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.
>>
> _______________________________________________
> 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.
>

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<div dir=3D"auto">You&#39;re really knowledgable about this Damian!=C2=A0 H=
ow do you work around the challenges with multiple leads, will each lead re=
quire it&#39;s own circuit?<div dir=3D"auto"><br></div><div dir=3D"auto">Th=
anks,</div><div dir=3D"auto">Steve</div></div><br><div class=3D"gmail_quote=
"><div dir=3D"ltr" class=3D"gmail_attr">On Sun, Sep 20, 2020, 1:17 PM Dami=
=C3=A1n Filo &lt;<a href=3D"mailto:[email protected]">[email protected]</=
a>&gt; wrote:<br></div><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=
>I am sorry for the spam, but in my previous e-mail I said: &quot;any of th=
ose changes you proposed are possible&quot; - that is false. One change you=
 mentioned was to feed raw data onto GPIO pins of RPi. That will not work, =
because what you need to do with the signal is to convert it from analog to=
 digital data through ADC and RPi doesn&#39;t have an ADCs. You can avoid u=
sing ATmega microcontrollers, but you still would have to use some external=
 chip with ADC functions. And then you would have to program your own firmw=
are and protocol, so you can use the data in applications running on RPi.<b=
r></div><div>Though what you can do with RPi is to feed the data directly f=
rom ATmega through native UART interface on RPi without the need for USB-UA=
RT chip. But about that, I am not really sure about the signalling voltage =
mismatch 5V/3.3V. So it is still preferred to use a USB interface with UART=
 bridge like CP2102.<br></div><div><br></div><div><div><div dir=3D"ltr" dat=
a-smartmail=3D"gmail_signature"><div dir=3D"ltr"><div>S pozdravom,</div><di=
v>Dami=C3=A1n Filo<br></div></div></div></div><br></div></div><br><div clas=
s=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">so 5. 9. 2020 o=C2=
=A021:49 Yonah Elorza &lt;<a href=3D"mailto:[email protected]" target=3D"_b=
lank" rel=3D"noreferrer">[email protected]</a>&gt; nap=C3=ADsal(a):<br></di=
v><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;borde=
r-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr"><div>H=
ello!</div><div><br></div><div>I&#39;m a computer engineer interested in ma=
king some modifications to the OpenEEG circuit, and had a few questions, if=
 anyone is available to answer them. I&#39;ve read through all the document=
ation on the website, and have worked with the OpenEEG platform for a few y=
ears now, and wanted to see if the following was possible:</div><div><br></=
div><div>-Designing better noise cancelling to reduce commons noise, as wel=
l as noise between electrodes.</div><div>-Integrating an FPGA into the desi=
gn which acts as a hardware Fast Fourier Transform</div><div>-Making the ci=
rcuit modular enough that you can stack multiple together to have 4, 8, 16,=
 etc. electrodes reading at the same time.<br></div><div>-Long term: modify=
ing the design of the circuit to work without the AT processor, instead hav=
ing hardware control from the GPIO of a Raspberry Pi, and all data being fe=
d raw to either the GPIO or USB interface of the Pi. <br><br></div><div>If =
anyone has reasons this wouldn&#39;t be possible, or if you have suggestion=
s for any of these changes, please let me know. I absolutely love this proj=
ect, and would love to be able to contribute my own work to it.<br></div><d=
iv><br>-- <br><div dir=3D"ltr"><div dir=3D"ltr"><div><div dir=3D"ltr"><div =
dir=3D"ltr" style=3D"font-size:12.8px"><div>Best Regards,<br></div>Yonah El=
orza<br></div><div dir=3D"ltr" style=3D"font-size:12.8px"><div style=3D"fon=
t-size:12.8px">Columbia School of Engineering | Class of 2018</div><div sty=
le=3D"font-size:12.8px">Computer Engineering</div><div style=3D"font-size:1=
2.8px">Tel:=C2=A0<a href=3D"tel:%28786%29%20205%20-%204304" value=3D"+17862=
054304" style=3D"color:rgb(17,85,204)" target=3D"_blank" rel=3D"noreferrer"=
>(</a><span><span title=3D"Call with Google Voice">305)-542-1735</span></sp=
an></div></div></div></div></div></div></div></div>
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Go to the above address to change your<br>
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</blockquote></div>
_______________________________________________<br>
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=3D"noreferrer">[email protected]</a><br>
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=3D"noreferrer noreferrer" target=3D"_blank">https://lists.sourceforge.net/=
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</blockquote></div>

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