Nose
Informed by the wonderful MuseJS project, Nose is a Muse interpreter that runs on Node so that EEG signals can be used in data analysis, to control web server behavior, and stream to clients. For example, this was used to circumvent the lack of a free and authoritative Bluetooth library for Unity on Android.
Usage
MuseBLE is the primary module for connecting to the Muse and decoding data. Most use cases call for MuseBLE.raw(uuid). Some other functions are available:
MuseBLE = {
raw: function(uuid: string): [
Promise<Array<Observable<number>>>, // one Observable per channel; Promise encapsulates the connection logic
Promise<[main_service: noble.Service, ctrl: noble.Characteristic]> //
],
send_command: function(ctrl: noble.Characteristic, cmd: string, no_response: bool = true),
FFT: function(uuid: string, FFT_WINDOW: number = 128, EDMSE_DECAY: number = 0.2): Promise<Array<Observable<dspjs.FFT>>>, // one Observable per channel; Promise encapsulates the connection logic
}Examples
Calculate a power estimate of the brainwave signal
const BL_UUID = '00:55:da:b7:0b:a0';
MuseBLE.FFT(BL_UUID).then(S => subscribe(fft => {
for(let i = Math.round(55 / f * y.length); i < 65 / f * y.length; i++) {
fft.spectrum[i] = 0;
} // blank the 60Hz noise profile
return fft.spectrum.reduce((acc, v) => acc + v*v, 0);
});
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