Emokit

Reverse engineering and original code written by

Cody Brocious (http://github.com/daeken)
Kyle Machulis (http://github.com/qdot)

Contributions by

Severin Lemaignan - Base C Library and mcrypt functionality
Sharif Olorin (http://github.com/fractalcat) - hidapi support
Bill Schumacher (http://github.com/bschumacher) - Fixed the Python library

Description

Emokit is a set of language for user space access to the raw stream data from the Emotiv EPOC headset. Note that this will not give you processed data (i.e. anything available in the Emo Suites in the software), just the raw sensor data.

The C library is backed by hidapi, and should work on any platform that hidapi also works on.

Information

FAQ (READ BEFORE FILING ISSUES): https://github.com/openyou/emokit/blob/master/FAQ.md

If you have a problem not covered in the FAQ, file it as an issue on the github project.

PLEASE DO NOT EMAIL OR OTHERWISE CONTACT THE DEVELOPERS DIRECTLY. Seriously. I'm sick of email and random facebook friendings asking for help. What happens on the project stays on the project.

Issues: http://github.com/openyou/emokit/issues

If you are using the Python library and a research headset you may have to change the is_research variable in emotiv.py's setup_crypto function.

Required Libraries

Python

pywinhid (Windows Only) - https://pypi.python.org/pypi/pywinusb/
(OS X) HIDAPI - http://www.signal11.us/oss/hidapi/
(OS X) cython-hidapi - https://github.com/gbishop/cython-hidapi
pycrypto - https://www.dlitz.net/software/pycrypto/
gevent - http://gevent.org
realpath - http://? sudo apt-get install realpath

C Language

CMake - http://www.cmake.org
libmcrypt - https://sourceforge.net/projects/mcrypt/
hidapi - http://www.signal11.us/oss/hidapi/

Usage

C library

See emokitd.c example

Python library

Code:

import emotiv
import platform
if platform.system() == "Windows":
    import socket
import gevent

if __name__ == "__main__":
  headset = emotiv.Emotiv()    
  gevent.spawn(headset.setup)
  gevent.sleep(0)
  try:
    while True:
      packet = headset.dequeue()
      print packet.gyro_x, packet.gyro_y
      gevent.sleep(0)
  except KeyboardInterrupt:
    headset.close()
  finally:
    headset.close()

Bindings

Go: https://github.com/fractalcat/emogo

Platform Specifics Issues

Linux

Due to the way hidapi works, the linux version of emokit can run using either hidraw calls or libusb. These will require different udev rules for each. We've tried to cover both (as based on hidapi's example udev file), but your mileage may vary. If you have problems, please post them to the github issues page (http://github.com/openyou/emokit/issues).

Your kernel may not support /dev/hidraw devices by default, such as an RPi. To fix that re-comiple your kernel with /dev/hidraw support

OS X

Recent OS versions no longer allow usb devices to become unclaimed by the kernel. You must use a HIDAPI library.

The render.py file uses pygame, visit http://pygame.org/wiki/MacCompile Do not export the architecture compiler flags for recent 64bit versions of OS X.

Credits - Cody

Huge thanks to everyone who donated to the fund drive that got the hardware into my hands to build this.

Thanks to Bryan Bishop and the other guys in #hplusroadmap on Freenode for your help and support.

And as always, thanks to my friends and family for supporting me and suffering through my obsession of the week.

Credits - Kyle

Kyle would like to thank Cody for doing the hard part.

He would also like to thank emotiv for putting emo on the front of everything because it's god damn hilarious. I mean, really, Emo Suites? Saddest hotel EVER.

Frequently asked questions

What unit is the data I'm getting back in? How do I get volts out of it?

One least-significant-bit of the fourteen-bit value you get back is 0.51 microvolts. See the specification for more details.

jspenc72 / emokit