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'use strict'; | ||
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/** | ||
* External Dependencies | ||
*/ | ||
var argv = require('yargs').argv; | ||
var OpenBCIBoard = require('openbci-sdk'); | ||
var io = require('socket.io')(process.env.app_port || 8080); | ||
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/** | ||
* Internal Dependencies | ||
*/ | ||
const Providers = require('./providers'); | ||
const Modules = require('./modules'); | ||
const Utils = require('./utils'); | ||
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// OpenBCI | ||
const connector = new OpenBCIBoard.OpenBCIBoard({ | ||
verbose: true | ||
}); | ||
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const Signals = new Providers.Signals({ connector, io }); | ||
const TimeSeries = new Modules.TimeSeries({ connector, io, signalEvent: Signals.signalEvent }); | ||
const Topo = new Modules.Topo({ connector, io, signalEvent: Signals.signalEvent }); | ||
const FFT = new Modules.FFT({ connector, io, signalEvent: Signals.signalEvent }); | ||
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global.scale = 1.5; | ||
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connector.autoFindOpenBCIBoard() | ||
.then(onBoardFind) | ||
.catch(() => { | ||
if (!!(argv._[0] && argv._[0] === 'simulate')) { | ||
global.scale = 4; | ||
connector | ||
.connect(OpenBCIBoard.OpenBCIConstants.OBCISimulatorPortName) | ||
.then(onBoardConnect); | ||
} | ||
}); | ||
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// Board find handler | ||
function onBoardFind (portName) { | ||
if (portName) { | ||
console.log('board found', portName); | ||
connector.connect(portName) | ||
.then(onBoardConnect); | ||
} | ||
} | ||
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// Board connect handler | ||
function onBoardConnect () { | ||
connector.on('ready', onBoardReady); | ||
} | ||
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// Board ready handler | ||
function onBoardReady () { | ||
connector.streamStart(); | ||
TimeSeries.listen(); | ||
FFT.listen(); | ||
Topo.listen(); | ||
connector.on('sample', onSample); | ||
} | ||
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function onSample (sample) { | ||
Signals.buffer(sample); | ||
} | ||
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/** | ||
* disconnectBoard | ||
*/ | ||
function disconnectBoard () { | ||
connector.streamStop() | ||
.then(function () { | ||
connector.disconnect().then(function () { | ||
console.log('board disconnected'); | ||
process.exit(); | ||
}); | ||
}); | ||
} | ||
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process.on('SIGINT', disconnectBoard); |
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'use strict'; | ||
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const dsp = require('dsp.js'); | ||
const Utils = require('../utils'); | ||
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module.exports = class FFT { | ||
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constructor ({ connector, io, signalEvent }) { | ||
this.connector = connector; | ||
this.io = io; | ||
this.signalEvent = signalEvent; | ||
this.bins = 512; // aka ~2 seconds | ||
this.bufferSize = 512; | ||
this.sampleRate = this.connector.sampleRate(); // aka 250 | ||
this.spectrums = [[],[],[],[],[],[],[],[]]; | ||
this.spectrumsByBand = []; | ||
this.labels = []; | ||
this.bands = { | ||
delta: [1, 3], | ||
theta: [4, 8], | ||
alpha: [8, 12], | ||
beta: [13, 30], | ||
gamma: [30, 100] | ||
}; | ||
} | ||
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listen () { | ||
this.signalEvent.on('bci:signal', (signals) => { | ||
this.signalsToFFT(signals); | ||
this.scaleLabels(); | ||
this.filterBands(); | ||
this.filterLabels(); | ||
this.emit(); | ||
}); | ||
} | ||
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signalsToFFT (signals) { | ||
signals.forEach((signal, index) => { | ||
//signal = Utils.filter.process(signal); | ||
let fft = new dsp.FFT(this.bufferSize, this.sampleRate); | ||
fft.forward(signal); | ||
this.spectrums[index] = Utils.data.parseObjectAsArray(fft.spectrum); | ||
this.spectrums[index] = Utils.signal.voltsToMicrovolts(this.spectrums[index], true); | ||
}); | ||
} | ||
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scaleLabels () { | ||
this.labels = new Array(this.bins / 2).fill() | ||
.map((label, index) => { | ||
return Math.ceil(index * (this.sampleRate / this.bins)); | ||
}); | ||
} | ||
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filterBands () { | ||
for (let band in this.bands) { | ||
this.spectrumsByBand[band] = Utils.filter.filterBand(this.spectrums, this.labels, this.bands[band]); | ||
} | ||
} | ||
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filterLabels () { | ||
// Skip every 8, add uni (too many labels issue) | ||
this.labels = this.labels.map((label, index, labels) => { | ||
return (index % 8 === 0 || index === (labels.length - 1)) ? label + ' Hz' : ''; | ||
}); | ||
} | ||
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emit () { | ||
this.io.emit('bci:fft', { | ||
data: this.spectrums, | ||
labels: this.labels, | ||
theta: this.spectrumsByBand.theta.spectrums, | ||
delta: this.spectrumsByBand.delta.spectrums, | ||
alpha: this.spectrumsByBand.alpha.spectrums, | ||
beta: this.spectrumsByBand.beta.spectrums, | ||
gamma: this.spectrumsByBand.gamma.spectrums | ||
}); | ||
} | ||
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} | ||
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'use strict'; | ||
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const FFT = require('./fft.module'); | ||
const TimeSeries = require('./time-series.module'); | ||
const Topo = require('./topo.module'); | ||
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module.exports = { | ||
FFT, | ||
TimeSeries, | ||
Topo | ||
} |
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'use strict'; | ||
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const Utils = require('../utils'); | ||
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module.exports = class TimeSeries { | ||
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constructor ({ connector, io, signalEvent }) { | ||
this.connector = connector; | ||
this.io = io; | ||
this.signalEvent = signalEvent; | ||
this.sampleRate = this.connector.sampleRate(); | ||
this.timeSeriesWindow = 5; // in seconds | ||
this.timeline = Utils.data.generateTimeline(20, 2, 's'); | ||
this.timeSeries = this.create(8); // 8 channels | ||
this.amplitudes = []; | ||
} | ||
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create (channelAmount) { | ||
let timeSeries = new Array(channelAmount).fill([]); | ||
return timeSeries.map((channel, channelNumber) => { | ||
return new Array((this.sampleRate * this.timeSeriesWindow)) | ||
.fill(0) | ||
.map((amplitude) => { | ||
// @TODO: Migrate scale (4) elsewhere | ||
return Utils.signal.offsetForGrid(amplitude, channelNumber, timeSeries.length, 4); | ||
}); | ||
}); | ||
} | ||
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listen () { | ||
this.signalEvent.on('bci:signal', (signal) => { | ||
this.offsetForGrid(signal); | ||
this.signalToAmplitudes(signal); | ||
this.emit(); | ||
}); | ||
} | ||
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offsetForGrid (signal) { | ||
this.timeSeries.forEach((channel, channelIndex) => { | ||
// @TODO: Migrate scale (4) elsewhere | ||
channel.push(Utils.signal.offsetForGrid(signal[channelIndex][signal[channelIndex].length - 1], channelIndex, this.timeSeries.length, 4)); | ||
channel.shift(); | ||
}); | ||
} | ||
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signalToAmplitudes (signal) { | ||
this.amplitudes = signal.map((channel) => { | ||
return (Math.round(Utils.signal.voltsToMicrovolts(channel[channel.length - 1])[0])) + ' uV'; | ||
}); | ||
} | ||
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emit () { | ||
this.io.emit('bci:time', { | ||
data: this.timeSeries, | ||
amplitudes: this.amplitudes, | ||
timeline: this.timeline | ||
}); | ||
} | ||
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} | ||
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'use strict'; | ||
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const topogrid = require('topogrid'); | ||
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const Utils = require('../utils'); | ||
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module.exports = class Topo { | ||
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constructor ({ connector, io, signalEvent }) { | ||
this.connector = connector; | ||
this.io = io; | ||
this.signalEvent = signalEvent; | ||
this.sampleRate = this.connector.sampleRate(); | ||
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/** | ||
* params: Parameters for the grid [x,y,z] where x is the min of the grid, y is the | ||
* Max of the grid and z is the number of points | ||
* x: coordinates of the data | ||
* y: coordinates of the data | ||
* grid: data = [10,0,0,0,0,0,-10,30,25]; // the data values | ||
*/ | ||
this.params = [0,10,11]; | ||
this.x = [3,7,2,8,0,10,3,7]; | ||
this.y = [0,0,3,3,8,8,10,10]; | ||
this.grid = []; | ||
} | ||
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listen () { | ||
this.signalEvent.on('bci:signal', (signal) => { | ||
this.signalToGrid(signal); | ||
this.emit(); | ||
}); | ||
} | ||
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signalToGrid (signal) { | ||
let grid = []; | ||
signal.forEach((channel) => { | ||
grid.push(channel[channel.length - 1]); | ||
}); | ||
this.grid = topogrid.create(this.x, this.y, grid, this.params); | ||
} | ||
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emit () { | ||
this.io.emit('bci:topo', { | ||
data: this.grid | ||
}); | ||
} | ||
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} |
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'use strict'; | ||
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const Signals = require('./signals.provider'); | ||
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module.exports = { | ||
Signals | ||
} |
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'use strict'; | ||
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const Utils = require('../utils'); | ||
const EventEmitter = require('events'); | ||
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class SignalEmitter extends EventEmitter {} | ||
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module.exports = class Signals { | ||
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constructor ({ connector, io }) { | ||
this.connector = connector; | ||
this.io = io; | ||
this.signalEvent = new SignalEmitter(); | ||
this.bins = 512; // aka ~2 seconds | ||
this.bufferSize = 512; | ||
this.windowRefreshRate = 32; | ||
this.windowSize = this.bins / this.windowRefreshRate; | ||
this.sampleRate = this.connector.sampleRate(); // aka 250 | ||
this.sampleNumber = 0; | ||
this.signals = [[],[],[],[],[],[],[],[]]; | ||
this.init(); | ||
} | ||
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init () { | ||
// Sockets | ||
this.io.on('connection', (socket) => { | ||
console.log('A user connected'); | ||
socket.on('bci:filter', (filter) => { | ||
Utils.filter.apply(filter); | ||
}); | ||
socket.on('disconnect', () => { | ||
console.log('user disconnected'); | ||
}); | ||
}); | ||
} | ||
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buffer (sample) { | ||
this.sampleNumber++; | ||
this.add(sample); | ||
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if (this.sampleNumber === this.bins) { | ||
this.signalEvent.emit('bci:signal', [...this.signals]); // clone array | ||
this.window(); | ||
} | ||
} | ||
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add (sample) { | ||
//console.log('sample added', sample); | ||
Object.keys(sample.channelData).forEach((channel, i) => { | ||
this.signals[i].push(sample.channelData[channel]); | ||
}); | ||
} | ||
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window () { | ||
this.signals = this.signals.map((channel) => { | ||
return channel.filter((signal, index) => { | ||
return index > (this.windowSize - 1); | ||
}); | ||
}); | ||
this.sampleNumber = this.bins - this.windowSize; | ||
} | ||
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} | ||
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