gistfile1.txt

var clapDetector = require('clap-detector'),
    _ = require('lodash');

clapDetector.start({
    DETECTION_PERCENTAGE_START : '5%',
    DETECTION_PERCENTAGE_END: '5%',
    CLAP_AMPLITUDE_THRESHOLD: 0.5,
    CLAP_ENERGY_THRESHOLD: 0.5,
    CLAP_MAX_DURATION: 100
});

var spinTimes = [],
    second = 0,
    calories = 0,
    distance = 0;

clapDetector.onClap(function() {
    spinTimes.push(Date.now());
});

setInterval( everySecond, 1000 );

function calculateRPMs() {
    var len = spinTimes.length,
        lastRPM = 0;

    if (len < 6) {
        lastRPM = _.round( 60 / ( ( spinTimes[len - 1] - spinTimes[0] ) / ( len - 1 ) / 1000 ), 1 );
    } else {
        lastRPM = _.round( 60 / ( ( spinTimes[len - 1] - spinTimes[len - 6 ] ) / 5 / 1000 ), 1 );
    }

    return lastRPM;
}

function everySecond() {
    var cadence = calculateRPMs(),
        out = '';

    if ( spinTimes.length ) {
        second++;
        out = second + ' seconds: ';
        var watts = _.round( ( 0.172 * Math.pow( cadence, 2 ) ) - ( 12.16 * cadence ) + 271.3, 3 );
        if ( watts > 0 ) {
            calories += watts * 3.9 / 60 / 60;
            var speed = cadence / ( 10 / 3 );
            distance += speed / 60 / 60;

            out = out + Math.floor( calories ) + ' cals ';
            out = out + _.round( distance, 3 ) + ' miles ';
            out = out + cadence + ' RPMs ';
            out = out + _.round(speed, 2) + ' mph ';
            out = out + watts + ' watts';
            console.log(out);
        }
    }
}