demo for playing music with ruff

ruff-music.js

'use strict';

// var f = [262, 294, 330, 349, 392, 440, 494, 523, 587, 659, 698, 784, 880, 988, 1047, 1175, 1319, 1397, 1568, 1760, 1976];

// var f = [1, 262, 294, 330, 349, 392, 440, 494];

var f = [1, 523, 587, 659, 698, 784, 880, 988, 1047]

var duration = 400;
var gap = 80;

var music = [1, 2, 3, 1, 1, 2, 3, 1, 3, 4, 5, 3, 4, 5,
    5, 6, 5, 4, 3, 1, 5, 6, 5, 4, 3, 1, 1, 5, 1, 1, 5, 1]


var beat = [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 8, 4, 4, 8,
    3, 1, 3, 1, 4, 4, 3, 1, 3, 1, 4, 4, 4, 4, 8, 4, 4, 8]

// var f = [10, 30, 50, 70, 90, 110, 130, 150, 170, 190, 210, 230, 250, 270, 290, 310, 330, 350, 370, 390, 410, 430, 450, 470, 490, 510];

$.ready(function (error) {
    if (error) {
        console.log(error);
        return;
    }

    // $('#buzzer').turnOn();
    for (var i = 0; i < 3; i++) {
        for (var j = 0; j < music.length; j++) {
            $('#led-r').turnOn();
            console.log('playing: ', f[music[j]]);
            play(f[music[j]],beat[j]);
            $('#buzzer').turnOff();
            $('#led-r').turnOff();
            delay(gap);
        }
        console.log('round: ', i);
    }

    $('#buzzer').turnOff();

})

function play(sound, beats) {
    var start = Date.now();
    var endAt = start + duration * beats / 4;
    var now = 0;
    var total = 1;
    while (Date.now() < endAt) {
        total++ % 2 ? $('#buzzer')._gpio.write(1) : $('#buzzer')._gpio.write(0);
        // console.log($('#buzzer')._gpio.read());
        delay((1 / sound) * 1000);

    }
}


function delay(milliseconds) {
    var start = new Date().getTime();
    for (var i = 0; i < 1e7; i++) {
        if ((new Date().getTime() - start) > milliseconds) {
            break;
        }
    }
}

$.end(function () {
    $('#led-r').turnOff();
    $('#buzzer')._gpio.write(0)
});