Monthly Downloads: 14
Programming language: Haskell
License: MIT License
Latest version: v0.6.4

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Haskell library and tool suite for the Emotiv Epoc EEG, inspired by the Emokit code.

It currently only works on Linux and Windows - patches for other platforms are welcome, they should be trivial.


You can download pre-built binaries here, or build it yourself via cabal install hemokit.

Library Features

  • device discovery via hidapi
  • decryption of the raw data (one-to-one port from from Emokit)
  • convenient access to sensor values, gyro, qualities, battery, and raw data


Hemokit comes with example programs to

  • hemokit-dump print out the current EEG data
  • hemokit-mouse move the cursor using the gyro

Note that we have to use sudo in most of the cases because the HIDAP-hidraw implementation reads directly from a device file.

hemokit-dump - Examples

hemokit-dump can print EEG data, format it as JSON, serve it via TCP or Websockets, and read from real devices and dump files.

  • Output EEG cumulative state for an automatically found device:
  sudo hemokit-dump
  • Select one of many connected EEGs by serial number:
  sudo hemokit-dump --serial SN...GM
  • Output only the data the device sends (no cumulative state), and format the output as JSON:
  sudo hemokit-dump --mode packets --format json

The --format flag allows you to change the way the output is printed. The output of --mode state --format spaced is especially easy to work with.

  • Instead of from a real device, read data recorded to a file, and serve it via JSON over a TCP server on port 1234:
  sudo cat /dev/hidraw1 > encrypted.dump  # Dump data to a file
  sudo hemokit-dump --from-file encrypted.dump --serial SN...GM --serve --format json

Here you have to specify the serial since HIDAPI is not used to obtain it automatically.

If you prefer a Websockets server over a raw TCP server, use ws:// instead.

  • Output decrypted raw data to stdout:
  sudo hemokit-dump --mode raw
  • Both print the data from the EEG and store the original data for later use:
  sudo cat /dev/hidraw1 | tee >(hemokit-dump --from-file - --serial SN...GM --format json) > encrypted.dump

We use tee and shell process substitution to duplicate the data stream, and tell hemokit-dump to read from - (stdin).

Connecting with other Programs

  • To use Hemokit as a data source from OpenVibe, check out the corresponding entry in the Wiki
  • To read Hemokit data from Matlab, I recommend publishing the data on a local socket in text format using hemokit-dump --format spaced --serve Then you can read it with code like:
t = tcpip('', 1234);
data = fscanf(t, '%d');