Python bindings for the Myo SDK
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README.md

NOTE Myo-Python 1.0 has been release and it comes with a number of API changes. If you have been following an older tutorial, you might have the new version installed but use code that worked with the old version.
Check the Migrating from v0.2.x section below.


Python bindings for the Myo SDK

Myo-Python is a CFFI wrapper for the Thalmic Myo SDK.

Table of Contents

Documentation

The documentation can currently be found in the docs/ directory in the GitHub Repository.

Example

Myo-Python mirrors the usage of the Myo C++ SDK in many ways as it also requires you to implement a DeviceListener that will then be invoked for any events received from a Myo device.

import myo

class Listener(myo.DeviceListener):
  def on_paired(self, event):
    print("Hello, {}!".format(event.device_name))
    event.device.vibrate(myo.VibrationType.short)
  def on_unpaired(self, event):
    return False  # Stop the hub
  def on_orientation(self, event):
    orientation = event.orientation
    acceleration = event.acceleration
    gyroscope = event.gyroscope
    # ... do something with that

if __name__ == '__main__':
  myo.init(sdk_path='./myo-sdk-win-0.9.0/')
  hub = myo.Hub()
  listener = Listener()
  while hub.run(listener.on_event, 500):
    pass

As an alternative to implementing a custom device listener, you can instead use the myp.ApiDeviceListener class which allows you to read the most recent state of one or multiple Myo devices.

import myo
import time

def main():
  myo.init(sdk_path='./myo-sdk-win-0.9.0/')
  hub = myo.Hub()
  listener = myo.ApiDeviceListener()
  with hub.run_in_background(listener.on_event):
    print("Waiting for a Myo to connect ...")
    device = listener.wait_for_single_device(2)
    if not device:
      print("No Myo connected after 2 seconds.")
      return
    print("Hello, Myo! Requesting RSSI ...")
    device.request_rssi()
    while hub.running and device.connected and not device.rssi:
      print("Waiting for RRSI...")
      time.sleep(0.001)
    print("RSSI:", device.rssi)
    print("Goodbye, Myo!")

Migrating from v0.2.x

The v0.2.x series of the Myo-Python library used ctypes and has a little bit different API. The most important changes are:

  • The Hub object no longer needs to be shut down explicitly
  • The DeviceListener method names changed to match the exact event name as specified by the Myo SDK (eg. from on_pair() to on_paired())
  • Hub.run(): The order of arguments is reversed (handler, duration_ms instead of duration_ms, handler)
  • myo.init(): Provides a few more parameters to control the way libmyo is detected.
  • myo.Feed: Renamed to myo.ApiDeviceListener

Projects using Myo-Python

Changes

v1.0.4

  • Remove myo.quaternion, it was a leftover and the Quaternion class was actually in myo.types.math
  • move myo.types.math and myo.types.macaddr to myo package instead
  • myo.types package is now a stub for backwards compatibility

v1.0.3 (2018-06-28)

  • Event.mac_address now returns None if the event's type is EventType.emg (#62)
  • Hub.run() now accepts DeviceListener objects for its handler parameter. This carries over to Hub.run_forever() and Hub.run_in_background().
  • Replace requirement nr>=2.0.10,<3 in favor of nr.types>=1.0.3

v1.0.2 (2018-06-09)

  • Fix Event.warmup_result (PR #58 @fribeiro1)

v1.0.1 (2018-06-09)

  • Fix Event.rotation_on_arm (#59)

v1.0.0 (2018-06-03)

  • Rewrite using CFFI

This project is licensed under the MIT License.
Copyright © 2015-2018 Niklas Rosenstein