Data Format Description

Units of Measure

MindroveSDK version >= 5.0.0

EXG LSB: µV (microvolt)

Gyroscope LSB: dps ( degrees per second )

Accelerometer LSB: g

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MindroveSDK version < 5.0.0

Measurement data (channels, IMU) are recorded as dimensionless numbers. You have to multiply these data by the following LSBs if you want to get the real values (in microvolts in case of EEG/EMG):

EXG LSB: 0.045 µV

Gyroscope LSB: 0.01526 dps

Accelerometer LSB: 0.061035 · 10−3 g

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For timestamps MindRove uses UNIX timestamp, this counter starts at the Unix Epoch on January 1st, 1970 at UTC. Precision is microsecond, but for some boards timestamps are generated on PC side as soon as packages were received.

You can compare MindRove’s timestamp with time returned by code like this:

import time
print (time.time ())

Generic Format Description

Methods like:

get_board_data ()
get_current_board_data (max_num_packages)

Return 2d double array [num_channels x num_data_points], rows of this array represent different channels like EEG channels, EMG channels, Accel channels, Timesteps and so on, while columns in this array represent actual packages from a board.

Exact format for this array is board specific. To keep the API uniform, we have methods like:

# these methods return an array of rows in this 2d array containing eeg\emg\ecg\accel data
get_eeg_channels (board_id)
get_emg_channels (board_id)
get_ecg_channels (board_id)
get_accel_channels (board_id)
# and so on, check docs for full list
# also we have methods to get sampling rate from board id, get number of timestamp channel and others
get_sampling_rate (board_id)
get_timestamp_channel (board_id)
# and so on

If board has no such data these methods throw an exception with UNSUPPORTED_BOARD_ERROR exit code.

Using the methods above, you can write completely board agnostic code and switch boards using a single parameter! Even if you have only one board using these methods you can easily switch to dummy MindRove boards and it will help you during developemnent and testing.

Other Channels

For a few data types we return data in get_other_channels().

Other channel index	Meaning
19	Beep or Boop value if present
29	Version number
30	Physical trigger (only used by MINDROVE_SYNCBOX_BOARD)
31	Automatic trigger (only used by MINDROVE_SYNCBOX_BOARD)