PyoMyo - Python Opensource Myo library

Overview

PyoMyo

Python module for the Thalmic Labs Myo armband.

Cross platform and multithreaded and works without the Myo SDK.

pip install pyomyo

Documentation is in the Wiki, see Getting Started.

Playing breakout with sEMG

Python Open-source Myo library

This library was made from a fork of the MIT licensed dhzu/myo-raw. Bug fixes from Alvipe/myo-raw were also added to stop crashes and also add essential features.

This code was then updated to Python3, multithreading support was added then more bug fixes and other features were added, including support for all 3 EMG modes the Myo can use.

Note that sEMG data, the same kind gathered by the Myo is thought to be uniquely identifiable. Do not share this data without careful consideration of the future implications.

Also note, the Myo is outdated hardware, over the last year I have noticed a steady incline in the cost of second hand Myos. Both of my Myo's were bought for under £100, I do not recommend spending more than that to acquire one. Instead of buying one you should join the discord to create an open hardware alternative!

Included Example Code

pyomyo.py

Prints sEMG readings at 200Hz straight from the Myo's ADC using the raw EMG mode.
Each EMG readings is between -128 and 127, it is the most "raw" the Myo can provide, however it's unlikely to be useful without extra processing. This file is also where the Myo driver is implemented, which uses Serial commands which are then sent over Bluetooth to interact with the Myo.

plot_emgs.py

Starts the Myo in mode 0x01 which provides data that's already preprocessed (bandpass filter + rectified).
This data is then plotted in pygame and is a good first step to see how the Myo works.
Sliding your finger under each sensor on the Myo will help identify which plot is for sensor. With the terminal selected press Ctrl + C to kill the processes.

simple_classifier.py

Uses a simple nearest neighbour classifier and predicts gestures live.
Make a gesture with one hand then press a number key to label the incoming EMG values that class.
Once two classes have been made new data is automatically classified. Labelled data is stored as a numpy array in the data directory.

myo_multithreading_examp.py

Devs start here.
This file shows how to use the library and get Myo data in a seperate thread.

Myo Modes Explained

To communicate with the Myo, I used dzhu's myo-raw. Then added some functions from Alvipe to allow changing of the Myo's LED.

emg_mode.PREPROCESSED (0x01)
By default myo-raw sends 50Hz data that has been rectified and filtered, using a hidden 0x01 mode.

emg_mode.FILTERED (0x02)
Alvipe added the ability to also get filtered non-rectified sEMG (thanks Alvipe).

emg_mode.RAW (0x03)
Then I further added the ability to get true raw non-filtered data at 200Hz. This data is unrectified but scales from -128 and 127.

Sample data and a comparison between data captured in these modes can be found in MyoEMGPreprocessing.ipynb

Owner
PerlinWarp
Recently graduated CS student working on VR and BCIs.
PerlinWarp
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