Reports.OlimexEEG-SMT History

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I got the sensor directly from Olimex (http://www.olimex.com/gadgets/index.html). As I made a parchase for research purposes, the manufacturer selled me the eeg-smt with a 20% off the 99EUR price (be careful with the price, it is expressed in EUROS). I also bought from them 5 electrodes, 1 passive and 4 active, and the 1.5 mt USB cable. The total value for the complet set is 113.60 EUR or approximately 150.36 USD (+ shipping).
to:
I got the sensor directly from Olimex (http://www.olimex.com/gadgets/index.html). As I made a parchase for research purposes, the manufacturer sold me the eeg-smt with a 20% off the 99EUR price (be careful with the price, it is expressed in EUROS). I also bought from them 5 electrodes, 1 passive and 4 active, and the 1.5 mt USB cable. The total value for the complete set is 113.60 EUR or approximately 150.36 USD (+ shipping).
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Pasive Electrodes: 5 EUR
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Passive Electrodes: 5 EUR
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-Realtime telemetry of brain signals
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-Real-time telemetry of brain signals
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Active and Pasive Electrodes
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Active and Passive Electrodes
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ďÖon the other hand it would also be possible to connect an arduino board to the EEG device, but via UART, not via USB (the EEG device is not a USB host, but also a client as the Arduino) - if you grab the UART signals (RX/TX) before the UART/USB converter you can connect the arduino via UART (http://en.wikipedia.org/wiki/Universal_asynchronous_receiver/transmitter).Ē






!! Testing
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ďÖon the other hand it would also be possible to connect an Arduino board to the EEG device, but via UART, not via USB (the EEG device is not a USB host, but also a client as the Arduino) - if you grab the UART signals (RX/TX) before the UART/USB converter you can connect the arduino via UART (http://en.wikipedia.org/wiki/Universal_asynchronous_receiver/transmitter).Ē



!! Presentation + Testing results samples
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http
://itp.nyu.edu/~mbv227/wp-content/uploads/2012/05/test-baby-crying.jpg

http://itp
.nyu.edu/~mbv227/wp-content/uploads/2012/05/test-Cesaria-Evora-Petit-Pay
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follow [[https://docs.google.com/file/d/0Bz4-7WlTvEzWcVRsQ2huWWpjVVk/edit | link text]] ...
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http://itp.nyu.edu/~mbv227/wp-content/uploads/2012/05/test-baby-crying.jpg

http://itp.nyu.edu/~mbv227/wp-content/uploads/2012/05/test-Cesaria-Evora-Petit-Pay
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http://itp.nyu.edu/~mbv227/wp-content/uploads/2012/05/MOD-EEG-SMT-3.jpg
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Options for DIY Electrodes:
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!!
Options for DIY Electrodes:
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******Medir con el osciloscopio (se puede generar una lista de valores?)
Describe the electrical changes when the sensor senses whatever physical changes it senses. Include graphs as needed.
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Until now I havenít had an easy experience with this device. The setup of it is not as easy as other commercial devices. Some problems Iíve had are the following:

-Sometimes the mouse goes crazy. I havenít tested it yet, but I think itís because of a COM port problem. Both devices Ė EEG-SMT and the mouse, are assigned to the same port.

-The readings until now are very random. Sometimes I get readings from one channel and sometimes I donít get any readings at all. Iíve emailed both, Olimex and BrainBay people, both have been very kind answering my questions, but I still havenít had any success.

-Havenít tested the passive electrode with gel yet. Maby that improves the signal.

-Almost all the time, the signal doesnít seem to respond to any change in the subjects (tester) state (eyes open, eyes closed, etc.)


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.
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SMT EEG + Brainwave test
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SMT EEG + Brainwave
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Olimex EEG-SMT + Brainwave
April 2nd, 2012
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!!
Olimex EEG-SMT + Brainwave

'''
April 2nd, 2012'''
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Typical Behavior
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!! Testing
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References/Bibliography

Add links to any reference material you used to learn about your sensor. Cite your sources for explanations, code, and circuits.

Keywords

Keywords
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!!
Keywords:
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Olimex EEG-SMT + Brainwave
April 2nd, 2012

MOD-EEG-SMT (http://www.olimex.com/gadgets/index.html)
The Modular [[http://www.olimex.com/gadgets/index.html | EEG-SMT]] is a ready-to-use two channel biofeedback board for electroencefalography (EEG). Compared to other medical EEG systems, this has a fairly good price. Unlike other Olimex modules, this board comes assembled in anti-static plastic box. It feeds and sends the readings through a A-B USB cable and requires 1 passive and 4 active (http://radek.superhost.pl/active_electrodes/index.php?action=theory) electrodes (or 5 passive electrodes).
This EEG device is setted up only for a windows environment and needs ftdi drivers and a software such as Electric Guru or Brain Bay to Start working with it. Personally I chose to use Brain Bay, an open source, free biofeedback software.



!! Sources

I got the sensor directly from Olimex (http://www.olimex.com/gadgets/index.html). As I made a parchase for research purposes, the manufacturer selled me the eeg-smt with a 20% off the 99EUR price (be careful with the price, it is expressed in EUROS). I also bought from them 5 electrodes, 1 passive and 4 active, and the 1.5 mt USB cable. The total value for the complet set is 113.60 EUR or approximately 150.36 USD (+ shipping).
--------------------------------------------------
The detailed list of prices is as follows:
MOD Ė EEG Ė SMT: 99 EUR
Active Electrodes: 9 EUR
Pasive Electrodes: 5 EUR
USB Cable: 2 EUR
---------------------------------------------------

Olimex doesnít have an online store, so the way to buy its products is buy emailing them and paying, for example, with paypal. They are located in Bulgaria, so be patient if you chose the cheapest shipping mode (about two weeks for the U.S.).
There are two important aspects regarding the shipping: you can take an insurance in case your package get lost or damaged, and is good to read the taxes disclaimer before you purchase if you are located in Europe. More info here (http://www.olimex.com/gadgets/index.html) and here (http://www.olimex.com/gadgets/index.html)
You can also make all the questions you have through their email, they are very kind and answer very quickly.



!!
Applications

Together with the electrodes, the SMT-EEG is a device made for sensing and amplify brain electrical activity, from the surface of the brain without surgery. It was meant to be used by people who are interested in EEGs and have not necessarily a medical or scientific background. Starting with a series of DIY EEG boards, the SMT-EEG is the newest device manufactured by Olimex, and first one to be completely assembled, calibrated and ready to use (release date: around mid November 2011).

Although I still donít have any information about people using it for specific projects, I can list a number of common or possible applications:
-Biofeedback (http://en.wikipedia.org/wiki/Biofeedback)
--Neurofeedback (http://en.wikipedia.org/wiki/Neurofeedback)
-Realtime telemetry of brain signals
-Patient monitoring

--Game interfaces
--Artistic applications
--etc.

An interesting place to find EEG projects is this (http://shifz.org/).





!! Electrical Characteristics

*MOD-EEG-SMT:
Operating Voltages:
-2.7V Ė 5.5V (for Atmega 16L)
-4.5V Ė 5.5V (for Atmega 16)
Power Consumption at 1 MHz, 3V, and 25ļC (for Atmega 16L)
-Active: 1.1mA
-Idle Mode: 0.35mA
-Power down Mode: < 1uA

*Electrodes:
Operating Voltage:
-5V


MOD-EEG-SMT Datasheets / Manuals
MOD-SMT-EEG Manual:
http://www.olimex.com/gadgets/index.html

MOD-SMT-EEG RevB Schematic:
http://www.olimex.com/gadgets/MOD-EEG-SMT/MOD-EEG-SMT-SCHEMATIC-REV-B.pdf



!! Inside components datasheets

ATMEL16 (inside microcontroller)
http://www.atmel.com/Images/doc2466.pdf

FT232R (USB to Asynchronus Serial Data Transfer)
http://www.ftdichip.com/Support/Documents/DataSheets/ICs/DS_FT232R.pdf

INA114 AU (Precision Instrumentation Amplifier)
http://gerard.paresys.free.fr/Projets/INA114.pdf

MCP6071 (High Precision Operational Amplifier Ė OpAmp)
http://ww1.microchip.com/downloads/en/DeviceDoc/22142_B_MCP6071.pdf

TLC277CD (Precision Dual Operational Amplifiers)
http://www.chipcatalog.com/TI/TLC277CD.htm
http://www.ti.com/lit/ds/symlink/tlc277.pdf

AP432SA (Adjustable Precision Shunt regulator)
http://www.diodes.com/datasheets/AP431_A.pdfTMV0505S

TMV0505S (DC / DC Converters)
http://www.tracopower.com/fileadmin/medien/dokumente/pdf/datasheets/tmv.pdf






ELECTRODE Parts Datasheets / Manuals
TL062CD (Op Amp)
http://www.futurlec.com/Linear/TL062CD.shtml

F2594TR-ND (ESD Supressor)
http://www.littelfuse.com/data/en/Data_Sheets/Littelfuse_PulseGuard-ESD_PGB1.pdf

BZV55C6V2 (Zenner Diode)
http://61.222.192.61/mccsemi/up_pdf/BZV55C%20Series%28MiniMELF%29.pdf

BAV199 (Low Leackeage Ė Double Diode)
http://www.nxp.com/documents/data_sheet/BAV199.pdf

---

Options for DIY Electrodes:
http://openeeg.sourceforge.net/doc/hw/ae.html
http://openeeg.sourceforge.net/doc/hw/electrodes/passive/


******Medir con el osciloscopio (se puede generar una lista de valores?)
Describe the electrical changes when the sensor senses whatever physical changes it senses. Include graphs as needed.


!!
Pin Descriptions


EEG-SMT I/O
CH1+: Positive pole for active electrode in channel 1
CH1-: Negative pole for active electrode in channel 1
CH2+: Positive pole for active electrode in channel 2
CH1-: Negative pole for active electrode in channel 2
DRL (http://www.biosemi.com/faq/cms&drl.htm): Driven Right Leg, must be a passive electrode. All the current flows towards this ground input.
USB Type-B: Universal Serial Bus for connecting EEG-SMT with computer. It works as a data and power source cable.

Atmega 16
Inside of the EEG-SMT is an 8bit Atmega with the following characteristics.




Active and Pasive Electrodes
-5VA: Power Input (+)
-AGND: Ground (-)
-OUT: Data output




!! Microcontroller Connections


Passive and Active Electrodes are connected to the EEG-SMT (through 3.5 plugs) which has an Atmega 16 in its circuit. To connect this device to the computer you will need an A -B USB cable. The Manufacturer recommends to use Electric Guru or BrainBay as softwares (only for Windows). I chose to use BrainBay which has really good examples for testing the board.

According to Brain Bayís creator, there shouldnít be any problem interfacing EEG-SMT with Processing, given that it has already an Atmega Microcontroller in it. To do so, somebody has to provide ďthe (or integrates the existing) code to read the signal data from the COM-port, to do something useful with it (e.g. graphical display etc.)Ē.

According to Olimex EEG-SMT User Manual, the Atmega16 can be re-programmed with an ICSP debugger/programmer (which is not delivered with this EEG). You can find a list of programmers from the same manufacturer in this Manual (http://www.olimex.com/gadgets/MOD-EEG-SMT/EEG-SMT-USERS%20MANUAL%20Revision%20B.pdf).

For security reasons, I havenít done this experience yet. But I would like to test it when I get more familiar with the board.


----

Other words about connecting it with Arduino:
ďÖon the other hand it would also be possible to connect an arduino board to the EEG device, but via UART, not via USB (the EEG device is not a USB host, but also a client as the Arduino) - if you grab the UART signals (RX/TX) before the UART/USB converter you can connect the arduino via UART (http://en.wikipedia.org/wiki/Universal_asynchronous_receiver/transmitter).Ē

SMT EEG + Brainwave test





Typical Behavior
Until now I havenít had an easy experience with this device. The setup of it is not as easy as other commercial devices. Some problems Iíve had are the following:

-Sometimes the mouse goes crazy. I havenít tested it yet, but I think itís because of a COM port problem. Both devices Ė EEG-SMT and the mouse, are assigned to the same port.

-The readings until now are very random. Sometimes I get readings from one channel and sometimes I donít get any readings at all. Iíve emailed both, Olimex and BrainBay people, both have been very kind answering my questions, but I still havenít had any success.

-Havenít tested the passive electrode with gel yet. Maby that improves the signal.

-Almost all the time, the signal doesnít seem to respond to any change in the subjects (tester) state (eyes open, eyes closed, etc.)


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.


References/Bibliography

Add links to any reference material you used to learn about your sensor. Cite your sources for explanations, code, and circuits.
Keywords

Keywords:
Electroencefalography, EEG, Olimex Modular EEG-SMT, Open EEG