node-kinetics

Node.js package for transforming accelerometer and gyroscope data

Build status

Notes

Assumes all input data to be 2D arrays

[[x1, y1, z1], [x2, y2, z2],...]
[[pitch1, roll1, yaw1]. [pitch2, roll2, yaw2],... ] (in Radians)

Credits

The description by Nghia Ho for rotation matrices was helpful
http://nghiaho.com/?page_id=846 (Cached: http://www.webcitation.org/6mHnx3sCs )

Installation

npm install kinetics --save

Usage

var kinetics = require('kinetics');

var attitude=[ 0, 0, 0 ];

var rot = kinetics.composeRotation(attitude[0],attitude[1],attitude[2]);
console.log(rot);

// returns: [ [ 1, 0, 0 ], [ 0, 1, 0 ], [ 0, 0, 1 ] ]

attitude=[ 0, Math.PI/2, 0 ];

rot = kinetics.composeRotation(attitude[0],attitude[1],attitude[2]);
console.log(rot);

// returns: [ [ 0, 0, 1 ], [ 0, 1, 0 ], [ -1, 0, 0 ] ]

var accelerometerData=[ [ 1, 2, 3], [ 4, 5, 6 ], [ 7, 8, 9 ] ];
var attitudeData=[ [ Math.PI/2, 0, 0 ], [ 0, Math.PI/2, 0 ], [ 0, 0, Math.PI/2 ] ];

var vert = kinetics.extractVerticalComponent(accelerometerData,attitudeData);    
console.log(vert);

// returns: [ -2, 4, 9 ]

var rsig = kinetics.rotateSignal(accelerometerData,attitudeData);
console.log(rsig);

// returns: [ [ 1, 3, -2 ], [ -6, 5, 4 ], [ 7, 8, 9 ] ]

Test

npm test

Returns:

Compose Rotation Matrix
  Test 1
    ✓ Should properly compute [0,0,0]
  Test 2
    ✓ Should properly compute [Pi/2,0,0]
  Test 3
    ✓ Should properly compute [0,Pi/2,0]
  Test 4
    ✓ Should properly compute [0,0,Pi/2]
  Test 5
    ✓ Should properly compute [1,1,1]

Extract Vertical Component
  Test 1
    ✓ Should properly compute [[[1,2,3],[4,5,6],[7,8,9]],[[0,0,0],[0,0,0],[0,0,0]]
  Test 2
    ✓ Should properly compute [[[1,2,3],[4,5,6],[7,8,9]],[[Pi/2,0,0],[Pi/2,0,0],[Pi/2,0,0]]
  Test 3
    ✓ Should properly compute [[[1,2,3],[4,5,6],[7,8,9]],[[1,1,1],[1,2,3],[3,2,1]]

Rotate Signal
  Test 1
    ✓ Should properly compute [[[1,2,3],[4,5,6],[7,8,9]],[[0,0,0],[0,0,0],[0,0,0]]
  Test 2
    ✓ Should properly compute [[[1,2,3],[4,5,6],[7,8,9]],[[Pi/2,0,0],[Pi/2,0,0],[Pi/2,0,0]]
  Test 3
    ✓ Should properly compute [[[1,2,3],[4,5,6],[7,8,9]],[[1,1,1],[1,2,3],[3,2,1]]


11 passing (11ms)

License

MIT License

Copyright (c) 2016 Maximilian Bügler

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.