TGAM1-EEGReader

Two arduino boards, wirelessly communicating via bluetooth, are able to get EEG waves and data from a TGAM1 powered device

Components

A list of components for both parts is exposed below

Transmitter (EEG Reader)

• Mindflex headset or some other device using a TGAM1 microchip.
• HC-05 Bluetooth module
• Arduino board (any)

Receiver

• HC-05 Blueetooth module
• Arduino board

Note that receiver is optional and a PC/laptop with bluetooth would suffy

Installation

There are two steps, first off performing some arduino core modifications.

Necessary arduino core code modifications

Arduino lacks of propper object polymorphism along HardwareSerial and SoftwareSerial. Both inherit from Stream, but Stream does not support begin (among others), which renders this library completely useless.

In order to solve this, a simple new base class has been added. Using code on [8] and [9] as base, a new class called AbstractSerial is parent of both Hardware and Software serials.

Definitions

This are just some paths and folder we will use in the step below, search them on your computer.

• ARDUINO_HOME = The folder where arduino ide/code was installed to
• CORE_FOLDER = ARDUINO_HOME/hardware/arduino/cores/arduino
• LIBRARY_FOLDER = ARDUINO_HOME/libraries

If you don't know what git, diffs and patchs are, go to Modifications - Manual. Be warned though that this may break arduino core code if used with other version than 1.0.5-r2.

Otherwise, head up to Modifications - Patching

Modifications - Manual

• Copy Modifications/AbstractSerial.h to arduino CORE_FOLDER
• Copy Modifications/HardwareSerial.h to arduino CORE_FOLDER
• Copy Modifications/SoftwareSerial.h to arduino LIBRARY_FOLDER/SoftwareSerial

Modifications - Patching

Excecute on ARDUINO_HOME via git console:

git apply --ignore-whitespace core_modifications.patch

If no errors pop, you are done.

##Finishing - Move library Move EEGReader folder to your arduino library folder, as it is a library.

Edit EEGReader/EEGReader.h file to set up the correct PIN ports!

Use Brain_Receiver and Brain_Transmitter to program your arduinos and start playing around.

Acknowledgements

A complete list of sources and articles used to develop the device

• [1] http://frontiernerds.com/brain-hack - Eric Mika's work on Mindflex hacking
• [2] https://github.com/kitschpatrol/Brain - Brain library for arduino to parse TGAM1 packets
• [3] http://developer.neurosky.com/docs/doku.php?id=thinkgear_communications_protocol - Neurosky (TGAM1) documentation
• [4] http://wearcam.org/ece1766/neurosky_eeg_brainwave_chip_and_board_tgam1.pdf - TGAM1 Datasheet
• [5] http://morloklabs.blogspot.com.es/2011/12/mindflex-duel-hacking-conversion-50hz-y.html - RAW/Normal mode hard switch for TGAM1
• [6] https://github.com/pcantin/bt2bt_HCa - Phillipe Cantin's code on configuring HC-05
• [7] http://wannabe-programmer.blogspot.com.es/2013/05/entrar-en-at-mode-de-un-hc-05-hc-06-con.html - HC-05 configuring
• [8] https://code.google.com/p/arduino/issues/detail?id=570 - Initial AbstractSerial class
• [9] https://code.google.com/p/arduino/issues/detail?id=60 - Outdated Serial base class

LICENSE

Copyright Guillem Pascual, 2010-2014 Licensed under the GNU Lesser General Public License.

This program is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with this program. If not, see http://www.gnu.org/licenses/.