Reports.ModularEEG History

Hide minor edits - Show changes to output

May 09, 2007, at 03:48 PM by Younghyun Chung - final report updated
May 09, 2007, at 03:48 PM by Younghyun Chung -
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3. Fax the PO form
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3. Fax the PO form

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""Amplifier""
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'''Amplifier'''
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May 09, 2007, at 03:45 PM by Younghyun Chung -
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3. Fax the PO form

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3. Fax the PO form
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""Amplifier""
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""Amplifier""
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""Microcontroller""
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'''Microcontroller'''
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""Electrode""
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'''Electrode'''
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1. Preparing parts
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'''Preparing parts'''
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2. Combining
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'''Combining'''
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1. Signal Testing using Hyperterminal
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'''Signal Testing using Hyperterminal'''
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1. Test result using [[http://www.cyberevolution.com/ | BioExplorer]] - "more software available in [[http://openeeg.sourceforge.net/doc/sw/ | this page]]"
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'''Test result''' using [[http://www.cyberevolution.com/ | BioExplorer]] - ''more software available in [[http://openeeg.sourceforge.net/doc/sw/ | this page]]''
May 09, 2007, at 03:42 PM by Younghyun Chung -
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- Simplified diagram of amplifier
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""Amplifier""
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- Diagram of microcontroller
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""Microcontroller""
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1. Electrically isolated from PC and external power


- Electrode
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- Electrically isolated from PC and external power


""Electrode""
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!!!How to Build
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!!!Microcontroller Connections
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2.

!!!Microcontroller Connections
Explain how to connect
the sensor to a microcontroller or computer. Include a schematic and any other necessary diagrams. Make sure to include a list of every part in the schematic.
to:
2. Combining
http://farm1.static.flickr.com/224/491461269_7ffece99a3_m.jpg

- plastic housing for
the whole unit
- metal housing for the analog board
- Connect two boards with 34-pin IDC cable (PCB-
to-PCB cable)

http://farm1.static.flickr.com/225/491461311_df4912d2fe_m.jpg http://farm1
.static.flickr.com/199/491448112_a826049783_m.jpg
- serial cable socket for connecting the cabel to the unit
- RCA socket for connecting the electrodes
- socket for connecting DRL
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Give a code sample for the microcontroller you developed the example on. Link it to the Code group of the wiki, formatting the link like this:

[=[[Code.myCodeSample | Code Sample]]=]
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1. Signal Testing using Hyperterminal
- check the USB port first
- setting: 57600 baud, 8 data bits, No parity, 1 stop bit, Flow control off
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Describe the behavior of the sensor when you use it to sense something. Note any peculiarities that you had to work around, or things that might affect someone else's use. Graphs and images are useful here.
to:
1. Test result using [[http://www.cyberevolution.com/ | BioExplorer]] - "more software available in [[http://openeeg.sourceforge.net/doc/sw/ | this page]]"

http://farm1.static.flickr.com/215/491461033_d884d4eacc_m.jpg http://farm1.static.flickr.com/222/491447776_df368101c2_m.jpg
- left: nervous status. Beta wave(12~25 Hz
, reddish) is dominant.
- right: after some meditation. Since not sleeping, beta wave is still high, but Alpha wave(8~12 Hz, blueish) is growing
May 09, 2007, at 03:21 PM by Younghyun Chung -
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!!! Component of hardware
- Simplified diagram of amplifier
http://farm1.static.flickr.com/210/491567854_3f4e965d6f_o.gif

1. Electrode
- 2 electrode for 1 signal
- To avoid drowning in noise

2. Protection Circuit
- Protects circuit from electrostatic discharge(ESD)
- Protects user from failing circuitary

3. Instrumentation amplifier
- Measures V-diff btw two location on the scalp
- Common-mode signal from inputs = ( (+)input + (-)input ) /2

4. Amplifier + high pass filter
- Amplify about 40 times
- Removes DC-voltage offsets: polarizable electrode can accumulate electric charge

5. DRL circuit (Driven Right Leg)
- Reduce common-mode noise by canceling it out
- Attenuates mains hum up to 100 times

6. Low pass filter
- Prevents aliasing effects when signal is digitezed


- Diagram of microcontroller
http://farm1.static.flickr.com/209/491571908_a95557c7fb_o.gif

1. Electrically isolated from PC and external power


- Electrode
1. Detects electrical current
2. Place them on your head

- Passive Electrode
= Just wire and electrode
= Need skin preparation conductive gel
- Active Electrode
= Built-in circuitry which amplifies the electrical current
= Improves signal quality and No skin preparation

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(
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(above parts and DRL(Driven Right Leg; Reduce common-mode noise by canceling it out, Attenuates mains hum up to 100 times), etc)
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2.
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- [[http://risknfun.com/psybridge | psybridge]: An adventure game that is played while sleeping by using the player's brainwaves as input. (on progress)
to:
- [[http://risknfun.com/psybridge | psybridge]]: An adventure game that is played while sleeping by using the player's brainwaves as input. (on progress)
May 09, 2007, at 03:12 PM by Younghyun Chung -
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2. Input of game, toy, etc.
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2. Research use
Theories to explain sleep

3
. Neurofeedback - Brain Computer Interface
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3. Assistive Technology - Brain-fed switch
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4. Assistive Technology
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!!!Characteristics of Brainwaves
* Major types
- Delta (~ 4 Hz): very young, brain disease, stage 3 and 4 sleep
- Theta (4 ~ 8 Hz): drowsiness, childhood
- Alpha (8 ~ 12 Hz): relaxed
- Beta (12 ~ 25 Hz): active, busy, anxious
- Gamma (26 100 Hz): higher mental activity - perception, problem solving, fear, consciousness

* Signal contains noise

* 1-2 mV on the surface of brain, 100 V on the scalp
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!!! Descriptions
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!!!How to Build
1. Preparing parts
http://farm1.static.flickr.com/196/491461089_c4bfac8c50_m.jpg http://farm1.static.flickr.com/192/491447960_f1f562cdea_m.jpg http://farm1.static.flickr.com/209/491447912_96c830471e_m.jpg
(Serial cable for connecting to a PC, 9V battery holder, RCA sockets for connecting the electrodes, respectively)

http://farm1.static.flickr.com/198/491461225_6490097fc3_m.jpg
(
May 09, 2007, at 03:02 PM by Younghyun Chung -
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||border=1 width=60%
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||border=1 width=40%
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- Supply Current
||border=1 width=40%
||Digital board||52 mA||
||Digital board + serial cable connected||56 mA||
||Total current (including 2 channel amp)||73 mA||
||Estimated total for 4 channel setup||77 mA||
||DC/DC converter efficiency||~78% ( =>15mA, 2 ch)||

- EEG Amplifier specification
||border=1 width=40%
||Gain||7812.5 (nominally)||
||Offset handling capability||TBD > 200 mVdc||
||Low frequency CMRR||TBD > 100 dB (?)||
||Highpass filter||2nd order, fc = 0.4Hz||
||Extra features||250 uV(+/-10%) test signal.
||.||DRL circuit - adds > 40dB CMRR at 50/60Hz.||

- AD-converter specification (AT90S4433)
||border=1 width=40%
||Number of channels||6||
||Resolution||10 bits||
||Effective number of bits||9.1 bits (< 100Hz)||
||Signal to Noise Ratio||58.7dB (max possible 60dB)||
||Integral Nonlinearity||+/- 0.5 LSB (typ)||
||Differential Nonlinearity||+/- 0.5 LSB (typ)||
||Offset Error||1 LSB (typ)||
||Absolute Accuracy (ADC clock = 200kHz)||1 LSB (typ), 2 LSB max||
||Gain error (Voltage reference error)||1% (typ), 2.25% max||
May 09, 2007, at 02:57 PM by Younghyun Chung -
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[[http://risknfun.com/psybridge | psybridge]]
[[http://www.bio-medical.com/product_info.cfm?inventory__imodel=mindball | Mindball EEG Game]]
[[http://www.neurosky.com/ | Some article about projects of neuroksy.com]]
to:
- [[http://risknfun.com/psybridge | psybridge]]
- [[http://www.bio-medical.com/product_info.cfm?inventory__imodel=mindball | Mindball EEG Game]]
- [[http://www.neurosky.com/ | Some article about projects of neuroksy.com]]
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[[http://www.theaustralian.news.com.au/story/0,20867,21433966-23289,00.html | Brain-fed switch]]
[[http://www.controlbionics.com/ | By pass physical disabilities with nerve-based signals]]
to:
- [[http://www.theaustralian.news.com.au/story/0,20867,21433966-23289,00.html | Brain-fed switch]]
- [[http://www.controlbionics.com/ | By pass physical disabilities with nerve-based signals]]
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Put a link to the datasheet at the top. Also link any retail sources, for example if you're using a breakout board, or any other parts that making the sensor easier.

Give the voltage and amperage ranges, and any other relevant electrical data.

Describe the electrical changes when the sensor senses whatever physical changes it senses.

!!! Pin
Descriptions
to:

- [[http://openeeg.sourceforge.net/doc/modeeg/modeeg_design.html | Modular Design Document]] - 2
.2 Technical specifications

http://farm1.static.flickr.com/217/491553155_54a57bb2b5_o.gif
Example EEG graph (courtesy of Nelo).

- General specification
||border=1 width=60%
||Number of channels||2 - 6||
||Resolution||four 10 bits, two 8 bits||
||Input Voltage Resolution||0.5 uV||
||Input Voltage Full Scale||+/-256 uV||
||Wideband noise||~ 1 uVp-p||
||Supply Current||(5V or 9 - 12V supply) 70 mA (2 channels)||
||Isolation voltage||2500V (1 minute)||
||Continuous isolation voltage||480V||


!!!
Descriptions
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Describe your own application of the sensor. Link to any external documentation of your project, and discuss how you got the sensor to do what you needed it to.
to:
- [[http://risknfun.com/psybridge | psybridge]: An adventure game that is played while sleeping by using the player's brainwaves as input. (on progress)
May 09, 2007, at 02:34 PM by Younghyun Chung -
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The OpenEEG project is about low cost hardware and software of brainwave detection and analyzation. ModularEEG is a cheap and open schematic hardware project of OpenEEG. However, building the hardware is not easy so this report arranges and condenses the instructions.
to:
The OpenEEG project is about low cost hardware and software of brainwave detection and analyzation. ModularEEG is a cheap and open schematic hardware project of OpenEEG. However, building the hardware is not easy so this report arranges and condenses the instructions. (EEG: Electro-Encephalo-Gram, that is Electronic-Brain-Record)
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Printed circuit boards(PCB's) or pre-built boards of ModularEEG is available from [[http://www.olimex.com/gadgets/index.html | Olimex]], $162.00 (AR180903A/ASM - Set of analog and digital assembled boards)

Outline here where you got your sensor, how much it cost and what your experience of getting it was like
.
to:
Printed circuit boards(PCB's) or pre-built boards by [[http://www.olimex.com/gadgets/index.html | Olimex]], $162.00
- Ordering Code: AR180903A/ASM - Set of analog and digital assembled boards)
- Process:
1. Send request email. (they have email filter for yahoo, hotmail, gmail, etc
. use @nyu.edu accounts or others)
2. Receive PO form
3. Fax the PO form
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Describe some typical applications of this sensor. You can often get this from the datasheet, but a few examples from companies or individuals who've used it would be useful as well.
to:
1. Clinical use - monitoring and diagnose
epilepsy, syncope(fainting), sleep disorder, eating disorder, coma
, brain death,

2. Input of game, toy, etc.
[[http://risknfun.com/psybridge | psybridge]]
[[http://www
.bio-medical.com/product_info.cfm?inventory__imodel=mindball | Mindball EEG Game]]
[[http://www.neurosky.com/ | Some article about projects of neuroksy.com]]

3. Assistive Technology - Brain-fed switch
[[http://www.theaustralian.news.com.au/story/0,20867,21433966-23289,00.html | Brain-fed switch]]
[[http://www.controlbionics.com/ | By pass physical disabilities with nerve-based signals]]
May 09, 2007, at 02:16 PM by Younghyun Chung -
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Put a paragraph or two here introducing the the sensor. You might want to add an introductory image as well.
to:
http://farm1.static.flickr.com/213/491508095_800f12fd6c.jpg

The OpenEEG project is about low cost hardware and software of brainwave detection and analyzation. ModularEEG is a cheap and open schematic hardware project of OpenEEG. However, building the hardware is not easy so this report arranges and condenses the instructions
.
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Printed circuit boards(PCB's) or pre-built boards of ModularEEG is available from [[http://www.olimex.com/gadgets/index.html | Olimex]], $162.00 (AR180903A/ASM - Set of analog and digital assembled boards)
May 09, 2007, at 01:52 PM by Younghyun Chung -
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Describe your own application of the sensor. Link to any external documentation of your project, and discuss how you got the sensor to do what you needed it to.
to:
Describe your own application of the sensor. Link to any external documentation of your project, and discuss how you got the sensor to do what you needed it to.

!!!Acknowledgments
Some pictures are from [[http://openeeg.sourceforge.net/doc/ | OpenEEG website]]
.
May 09, 2007, at 01:49 PM by Younghyun Chung -
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Initial report by [=[[~Younghyun | Younghyun Chung]]=], 09, May, 2007
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Initial report by [[~Younghyun | Younghyun Chung]], 09, May, 2007
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May 09, 2007, at 01:36 PM by Younghyun Chung -
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[[Reports.SensorName | Title of the Report]] - Short description, if necessary -[[~yourLogin]]

Initial report by [=[[~login | Your Name]]=], day, month, year
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Initial report by [=[[~Younghyun | Younghyun Chung]]=], 09, May, 2007
May 09, 2007, at 01:35 PM by Younghyun Chung -
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[[Reports.SensorName | Title of the Report]] - Short description, if necessary -[[~yourLogin]]

Initial report by [=[[~login | Your Name]]=], day, month, year

Put a paragraph or two here introducing the the sensor. You might want to add an introductory image as well.


!!!Sources

Outline here where you got your sensor, how much it cost and what your experience of getting it was like.


!!!Applications

Describe some typical applications of this sensor. You can often get this from the datasheet, but a few examples from companies or individuals who've used it would be useful as well.

!!!Electrical Characteristics
Put a link to the datasheet at the top. Also link any retail sources, for example if you're using a breakout board, or any other parts that making the sensor easier.

Give the voltage and amperage ranges, and any other relevant electrical data.

Describe the electrical changes when the sensor senses whatever physical changes it senses.

!!! Pin Descriptions
Give a list of the pins, and a pin diagram as appropriate. Detail the function of each pin in a short paragraph following the list.


!!!Microcontroller Connections
Explain how to connect the sensor to a microcontroller or computer. Include a schematic and any other necessary diagrams. Make sure to include a list of every part in the schematic.

!!!Code Sample
Give a code sample for the microcontroller you developed the example on. Link it to the Code group of the wiki, formatting the link like this:

[=[[Code.myCodeSample | Code Sample]]=]

!!!Typical Behavior
Describe the behavior of the sensor when you use it to sense something. Note any peculiarities that you had to work around, or things that might affect someone else's use. Graphs and images are useful here.

!!!Application Notes
Describe your own application of the sensor. Link to any external documentation of your project, and discuss how you got the sensor to do what you needed it to.