myo-web-bluetooth.js's Introduction

Myo-web-bluetooth.js

Connect to the Myo armband using Web Bluetooth.

Steps:

Turn on your bluetooth.
Visit this page
Click on the 'Connect' button.
If no device is recognised, make sure the name of your Myo is the same one as me ("Myo").
If the gestures are not recognised, make sure you execute the 'sync' gesture before connecting.

How to use:

window.onload = function(){

  let button = document.getElementById("connect");

  button.onclick = function(e){
    var myoController = new MyoWebBluetooth("Myo");
    myoController.connect();

    myoController.onStateChange(function(state){
      let batteryLevel = state.batteryLevel + '%';
      console.log(batteryLevel);
    });
  }
}

Data available:

Battery Level:

  state.batteryLevel;

Arm type:

  //returns 'right' or 'left';
  state.armType;

Arm synced:

  state.armSynced;

Myo direction:

  // returns 'wrist' or 'elbow';
  state.myoDirection;

Myo locked:

  state.myoLocked;

Orientation data:

  state.orientation.x;
  state.orientation.y;
  state.orientation.z;

Gyroscope data:

  state.gyroscope.x;
  state.gyroscope.y;
  state.gyroscope.z;

Accelerometer data:

  state.accelerometer.x;
  state.accelerometer.y;
  state.accelerometer.z;

Pose data:

  // returns 'fist', 'wave in', 'wave out', 'fingers spread' or 'double tap';
  state.pose;

Services and characteristics:

Available so far:

Control Service
- Command characteristic
IMU Data Service
- IMU Data characteristic
EMG Data Service
- EMG Data characteristic
Battery Service
- Battery level characteristic
Classifier Service
- Classifier event characteristic

To do:

Add images of poses for visual feedback.
Make orientation data work with 3d model.

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myo-web-bluetooth.js's Issues

Reading wrong IMU data in your code

New on github. In your master/myo-web-bluetooth.js you have written:

"
    let orientationW = event.target.value.getInt16(0) / 16384;
    let orientationX = event.target.value.getInt16(2) / 16384;
    let orientationY = event.target.value.getInt16(4) / 16384;
    let orientationZ = event.target.value.getInt16(6) / 16384;

    let accelerometerX = event.target.value.getInt16(8) / 2048;
    let accelerometerY = event.target.value.getInt16(10) / 2048;
    let accelerometerZ = event.target.value.getInt16(12) / 2048;

    let gyroscopeX = event.target.value.getInt16(14) / 16;
    let gyroscopeY = event.target.value.getInt16(16) / 16;
    let gyroscopeZ = event.target.value.getInt16(18) / 16;
"

The mistake you did is getInt16(byteOffset [, littleEndian])
The Myo data format is in Little Endian. And you read big-endian value. So the corrected code would be:

"
  let orientationW = event.target.value.getInt16(0,true) / 16384;
  let orientationX = event.target.value.getInt16(2,true) / 16384;
  let orientationY = event.target.value.getInt16(4,true) / 16384;
  let orientationZ = event.target.value.getInt16(6,true) / 16384;

  let accelerometerX = event.target.value.getInt16(8,true) / 2048;
  let accelerometerY = event.target.value.getInt16(10,true) / 2048;
  let accelerometerZ = event.target.value.getInt16(12,true) / 2048;

  let gyroscopeX = event.target.value.getInt16(14,true) /16;
  let gyroscopeY = event.target.value.getInt16(16,true) /16;
  let gyroscopeZ = event.target.value.getInt16(18,true) /16;
"

Please correct it. It will be helpful for others.
Thank you very much for writing Myo Web BLE project.