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That circuit inverts the common mode signal from the instrumentation amp, sums the result from each instrumentation amp, and sends the total back to the body.
 
That circuit inverts the common mode signal from the instrumentation amp, sums the result from each instrumentation amp, and sends the total back to the body.
  
The ADCs have a syncronise option... I have to look into this....
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The ADCs simultaneously digitize all the analog signals ''(really?)'' I have to look into this....
 
The ADCs send bits of information (representing the original analog electrical signals) to the controller motherboard.
 
The ADCs send bits of information (representing the original analog electrical signals) to the controller motherboard.
  
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The controller board can be programmed using AVR GCC.
 
The controller board can be programmed using AVR GCC.
  
Here is the Schematic
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[[image:UCschematicardunonmonolith.png]]
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Here is the circuit board of it.
 
look at [http://www.pceeg.sourceforge.net pceeg.sourceforge.net]
 
look at [http://www.pceeg.sourceforge.net pceeg.sourceforge.net]
  
Partlist  
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Partlist
 
look at [http://www.pceeg.sourceforge.net pceeg.sourceforge.net]
 
look at [http://www.pceeg.sourceforge.net pceeg.sourceforge.net]
  
Here is the circuit board
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Exported from PCEEG_Version_1.02_Alpha_05-09-08_uC.sch at 6/16/2008 3:41:30 PM
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EAGLE Version 5.0.0 Copyright (c) 1988-2008 CadSoft
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Part    Value          Device          Package      Library      Sheet
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B2                      RB1A            RB1A        rectifier    1
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C0      1000uf        CPOL-USE5-13    E5-13        rcl          1
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C1      .1uf          CAPNP-5@2      C-5@1        DISCRETE    1
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C2      1µF            ELC-2,5        EL25B        DISCRETE@2  1
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C3      330uf          CPOL-USE5-10.5  E5-10,5      rcl          1
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C4      .1uf          CAPNP-5        C-5          DISCRETE    1
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C5      47µF          ELC-5          EL25B        DISCRETE    1
 +
C6      .1uf          CAPNP-5@2      C-5@1        DISCRETE    1
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C7      .01uf          CAPNP-5        C-5          DISCRETE    1
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C8      .1uf          CAPNP-5        C-5          DISCRETE    1
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C9      47µF          ELC-5          EL25B        DISCRETE    1
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C13      0.1uF          C-US025-025X050 C025-025X050 minimidi    1
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C14      0.1uF          C-US025-025X050 C025-025X050 minimidi    1
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D1      Green          LED3MM          LED3MM      minimidi    1
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D2      RED            LED5            LED5        LED          1
 +
IC1                    78XXS          78XXS        v-reg        1
 +
IC2      ATMEGA168P    ATMEGA168PROUND DIL28/3      avr          1
 +
IC105    TMV0505S      TMV0505        TMADCDC      MODEEG      1
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J1      2.1MMJACK      2.1MMJACK      PJ-102A      minimidi    1
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JP1                    PINHD-2X3      2X03        pinhead-ez  1
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L1      22µH          L-10            R-12,5      DISCRETE@2  1
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L2      22µH          L-10            R-12,5      DISCRETE@2  1
 +
OK1      6N137          6N137          DIL08        optocoupler  1
 +
OK2      6N137          6N137          DIL08        optocoupler  1
 +
OK3      6N137          6N137          DIL08        optocoupler  1
 +
R1      1k            R-US_0207/5V    0207/5V      rcl          1
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R2      10k            R-US_0207/5V    0207/5V      rcl          1
 +
R3      1k            R-US_0207/5V    0207/5V      rcl          1
 +
R4      1k            R-US_0207/5V    0207/5V      rcl          1
 +
R5      1k            R-US_0207/5V    0207/5V      rcl          1
 +
R6      1k            R-US_0207/5V    0207/5V      rcl          1
 +
R7      1k            R-US_0207/5V    0207/5V      rcl          1
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R8      1k            R-US_0207/5V    0207/5V      rcl          1
 +
R9      1k            R-US_0207/5V    0207/5V      rcl          1
 +
S2      RESET          10-XX          B3F-10XX    switch-omron 1
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SV1                    MA03-1          MA03-1      con-lstb    1
 +
SV2                    MA09-1          MA09-1      con-lstb    1
 +
SV3                    MA03-1          MA03-1      con-lstb    1
 +
SV4                    MA03-1          MA03-1      con-lstb    1
 +
SV7                    MA06-1          MA06-1      con-lstb    1
 +
SV8                    MA08-1          MA08-1      con-lstb    1
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USB.I/O                MA06-1          MA06-1      con-lstb    1
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X2      16.00MHz      CERMOSCILL      CERM_OSC    digg        1
 +
 
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Working on some other improvements... C123 with 1uF is much too small. Use 1000uF or so instead.
 
look at [http://www.pceeg.sourceforge.net pceeg.sourceforge.net]
 
look at [http://www.pceeg.sourceforge.net pceeg.sourceforge.net]
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[[image:adschematicad1256devbrdnmonolith.png]]
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Here is the circuit board of it.
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[[image:PCEEG_Version_1.34_Alpha_06-15-08_ADBrd.png]]
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Partlist
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see the [pceeg.sourceforge.net] for the latest parts list.
  
 
== Parts used in the PCEEG: ==
 
== Parts used in the PCEEG: ==
 
* [http://opencircuits.com/LT1168 LT1168 Resistor-Programmable-Gain Precision Instrumentation Amplifier] is used to amplify the weak electric signals coming from the brain through electrodes attached to the scalp, etc.
 
* [http://opencircuits.com/LT1168 LT1168 Resistor-Programmable-Gain Precision Instrumentation Amplifier] is used to amplify the weak electric signals coming from the brain through electrodes attached to the scalp, etc.
* and more...
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* Several [http://opencircuits.com/LT1114 LT1114 Low Power Precision OP-Amps] are used for amplification and filtering of the signal
  
 
==ESD Protection in 1168==
 
==ESD Protection in 1168==
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* Maxima a computer algebra system s used for graphing and math displays.
 
* Maxima a computer algebra system s used for graphing and math displays.
 
*SPI interface code for a/d converters from TI for developers
 
*SPI interface code for a/d converters from TI for developers
*SPI interface for the arduino with a eeprom
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*kicad
 
 
=== How You Can Help ===
 
=== How You Can Help ===
 
#. get the tools
 
#. get the tools
#. what is better old or new analog to digital converter boards power supply?
 
#. simulate the circuit?
 
#. how does the circuit look to you analog amplifier board needs more people looking at it and so does the analog to digital converter board.
 
#. help code for the avr mega 168 arduino clone with isolation to communicate with the ads1256 a/d converter.
 
  
 
== Open Source Circuit Design ==
 
== Open Source Circuit Design ==
 
* [http://opencircuits.com/Programmable_Chip_EEG Open Source Circuit Design ]
 
* [http://opencircuits.com/Programmable_Chip_EEG Open Source Circuit Design ]
* [http://pceeg.sourceforge.net/ The Programmable Chip EEG Brain Computer Interface Open Source Circuit Design]
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* [http://pceegbci.blog.com/ The Programmable Chip EEG Open Source Circuit Design BLog] ''(BrokenLink -- I hope this is only temporarily offline. --[[User:DavidCary|DavidCary]] 10:12, 8 October 2007 (PDT) )''
  
 
== ideas for future work ==
 
== ideas for future work ==
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Please contribute and make the PCEEG a great tool for researching brain computer interfaces.
 
Please contribute and make the PCEEG a great tool for researching brain computer interfaces.
  
 
== Related wiki ==
 
 
* [[OpenEEG]]
 
* [http://wiki.asiaquake.org/openeeg/published/ The OpenEEG wiki]
 
* [http://pceeg.wikia.com/wiki/Main_Page wiki cities on pceeg]
 
* [http://en.wikibooks.org/wiki/Biomedical_Engineering:_A_Roadmap/Biomedical_Instrumentation/Electrocardiography Wikibooks: Biomedical Engineering: Electrocardiography]
 
  
 
== See also: ==
 
== See also: ==
* [https://electrical.codidact.com/posts/287954 "what can you do to mitigate noise pickup... [in] ... EKGs...?"]
 
* [https://electrical.codidact.com/posts/288010 "What is a good PCB-layout? ... an ECG-amplifier circuit."]
 
 
* [http://www.nytimes.com/2008/01/15/science/15robo.html?ex=1359090000&en=69146e0fb3807a74&ei=5124&partner=permalink&exprod=permalink/ Monkey’s Thoughts Propel Robot, a Step That May Help Humans ]
 
* [http://www.nytimes.com/2008/01/15/science/15robo.html?ex=1359090000&en=69146e0fb3807a74&ei=5124&partner=permalink&exprod=permalink/ Monkey’s Thoughts Propel Robot, a Step That May Help Humans ]
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* [http://wiki.asiaquake.org/openeeg/published/ The OpenEEG wiki]
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* [http://pceegbci.blog.com/ The Open EEG Brain Computer Interface BLog]
 
* [http://www.larryheadinstitute.com/eeg-training.html EEG Training Seminars]
 
* [http://www.larryheadinstitute.com/eeg-training.html EEG Training Seminars]
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* [http://pceeg.wikia.com/wiki/Main_Page wiki cities on pceeg]
 
* [http://pceeg.sourceforge.net pceeg.sourceforge.net]
 
* [http://pceeg.sourceforge.net pceeg.sourceforge.net]
 
* [http://www.answers.com/topic/miguel-nicolelis miguel nicolelis]
 
* [http://www.answers.com/topic/miguel-nicolelis miguel nicolelis]
 
* [http://maxima.sourceforge.net/ Maxima - a computer algebra system]
 
* [http://maxima.sourceforge.net/ Maxima - a computer algebra system]
* [[PCB Manufacturers]]
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* [http://www.scienceprog.com/ digital high pass filters and other circuits]
* [http://www.meta-mind.de Brainwave Neurofeedback open source]
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* [http://hcvl.hci.iastate.edu/cgi-bin/openEyes.cgi human and computer vision lab]
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* [[PCB Manufacturers]] such as [http://www.batchpcb.com/index.php www.batchpcb.com]
 
* [http://vulliard.dyndns.org/~vulliard/ eeg biofeedback "mind machine"]
 
* [http://vulliard.dyndns.org/~vulliard/ eeg biofeedback "mind machine"]
 
* [http://freenet-homepage.de/moosec/projekte/simpleeeg/index-Dateien/Page431.htm monolith eeg]
 
* [http://freenet-homepage.de/moosec/projekte/simpleeeg/index-Dateien/Page431.htm monolith eeg]
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* [http://mindhacks.com/blog/2007/01/meg_scanning_the_bra.html yet another pundit disrespects the EEG]
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* [http://www.pololu.com/laser_cutting.html lazer cutting for box & solder paste stencil]
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* [http://www.amazon.com/Build-Your-Printed-Circuit-Board/dp/007142783X?tag2=zottmann1-20 Build Your Own Printed Circuit Board]
 
* [http://www.stencilsunlimited.com/solder_products.php solder paste for surface mount that can be stored at room temperature]
 
* [http://www.stencilsunlimited.com/solder_products.php solder paste for surface mount that can be stored at room temperature]
 
* The thread [http://forum.microchip.com/tm.aspx?m=114626 "amplifying biomedical signals: 150 uA with 16 bit resolution?"] has several op-amp suggestions, and mentions that "a good, low-noise, low-cost, isolated EMG/EEG amplifier is one of the most demanding analog electronics designs."
 
* The thread [http://forum.microchip.com/tm.aspx?m=114626 "amplifying biomedical signals: 150 uA with 16 bit resolution?"] has several op-amp suggestions, and mentions that "a good, low-noise, low-cost, isolated EMG/EEG amplifier is one of the most demanding analog electronics designs."
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* Is there a [http://www.electronicproducts.com/ShowPage1.asp?SECTION=&PRIMID=&FileName=medtelconf3%2Ejul2004%2Ehtml&ReturnLink=%2FSearch1%2Easp%3FManufacturer%3D%26Keyword%3Dimplantables%26Slot%3D0%26StartNum%3D1%26stype%3D%26year%3D10&MonthYear=Jul+2004 Medical Electronics Forum]?
 
* Is there a [http://www.electronicproducts.com/ShowPage1.asp?SECTION=&PRIMID=&FileName=medtelconf3%2Ejul2004%2Ehtml&ReturnLink=%2FSearch1%2Easp%3FManufacturer%3D%26Keyword%3Dimplantables%26Slot%3D0%26StartNum%3D1%26stype%3D%26year%3D10&MonthYear=Jul+2004 Medical Electronics Forum]?
 
* [http://www.makezine.com/blog/archive/2006/01/homemade_electrocardiograph.html Make: Homemade Electrocardiograph] ([http://www.eng.utah.edu/~jnguyen/ecg/ecg_index.html] recommends skin lotion or shampoo as a low-cost electrode gel)
 
* [http://www.makezine.com/blog/archive/2006/01/homemade_electrocardiograph.html Make: Homemade Electrocardiograph] ([http://www.eng.utah.edu/~jnguyen/ecg/ecg_index.html] recommends skin lotion or shampoo as a low-cost electrode gel)
* [http://www.techradar.com/reviews/pc-mac/peripherals/input-devices/general-input-devices/ocz-neural-impulse-actuator--269721/review "OCZ Neural Impulse Actuator review"]
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* the [http://vadim.oversigma.com/esl/esl.html "Every Sign of Life"] project proposes a "personal health monitor capable of measuring EKG, temperature, respiration, and other physiological parameters". Perhaps the Programmable Chip EEG could somehow be used with it?
+
 
* [http://solar-blogg.blogspot.com/search/label/Heart solar-blogg]: Optical Heartbeat Detector and yet another DIY Electrocardiograph
+
 
* [http://www.biosemi.com/publications/artikel3.htm "High quality recording of bioelectric events. I: Interference reduction, theory and practice"] by A. C. MettingVanRijn, A. Peper, C. A. Grimbergen. (1988?)
 
* [http://www.swharden.com/blog/2009-08-14-diy-ecg-machine-on-the-cheap/ "DIY ECG Machine On The Cheap"] by Scott Harden.
 
* [http://wish.seeedstudio.com/?p=60 "2-lead electrocardiogram (ECG) analog frontend."]
 
* [http://www.youtube.com/watch?v=yADsi5W-Lls "Collin's Lab: Infrared heart sensor"] using an Arduino, an infrared emitter and detector pair, and two resistors.
 
* [http://code.google.com/p/opendous/wiki/BioSensorPlatform "BioSensorPlatform: ADS1298 Based Biopotential Sensor Platform"] "an OpenHardware Biopotential Sensor Platform based on TI's ADS1298 ADC with ECG/EEG front end." "Design files are available in Open Formats for the KiCAD Open Source EDA Suite." 8 channels of simultaneous sampling 24-bit ADC inputs, and also a Wilson central terminal output and a right-leg drive (RLD) output.
 
* [https://github.com/qdot/emokit emokit], now part of [http://www.openyou.org/ OpenYou], supports the Emotiv headset, also called the Emotiv EPOC Brain-Computer Interface. (via [http://daeken.com/emokit-hacking-the-emotiv-epoc-brain-computer-0 Daeken])
 
* [http://electronics.stackexchange.com/questions/tagged/biopotential Electronics Stackexchange questions tagged "biopotential"]
 
* [http://electronics.stackexchange.com/questions/21924/16-channel-eeg-data-aquisition-system "16 channel EEG data aquisition system"]
 
* [http://electronics.stackexchange.com/questions/25198/noise-reduction-strategies-in-electrophysiology "Noise reduction strategies in electrophysiology"]
 
* [http://en.wikipedia.org/wiki/Multiscale_Electrophysiology_Format Wikipedia: Multiscale Electrophysiology Format]
 
  
 
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[[Category:Projects]]

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