Double Clap Lights

double-clap.ts

import { Board, Sensor } from 'johnny-five';
import { Observable, Observer } from 'rxjs/Rx';

// The pin that's microphone connected to
const SENSOR_PORT: number = 3;

// Delay between the two claps
const DCLAP_DELAY: number = 500;

const board = new Board();

function fromSensor<T>(sensor: Sensor): Observable<T> {
    return Observable.create((observer: Observer<T>) => {
        sensor.on('change', () => {
            observer.next((this.value as T));
        });
    });
}

board.on('ready', () => {
    const mic$ = fromSensor<number>(new Sensor(SENSOR_PORT));

    const doubleClap$ = mic$
        .bufferTime<number>(DCLAP_DELAY)
        .map((list: number[]) => list.length)
        .filter((x: number) => x === 2);

    doubleClap$.subscribe(console.log);
});