Mary Had A Little Lamb - DTMF

dtmf--mary-had-a-little-lamb.js

// Navigate to http://onlinetonegenerator.com/dtmf.html
// Open DevTools - Console
// Paste the Code
// Press Enter

// Provide the number of milliseconds the default tone should hold for
var short = 250;
var long = short * 2;

function sleep(ms) {
    return new Promise(resolve => setTimeout(resolve, ms));
}

var release = async function(duration){
    await sleep(duration);
    stop();
}

var tones = {
    '0': [941.0, 1336.0],
    '1': [697.0, 1209.0],
    '2': [697.0, 1336.0],
    '3': [697.0, 1477.0],
    '4': [770.0, 1209.0],
    '5': [770.0, 1336.0],
    '6': [770.0, 1477.0],
    '7': [852.0, 1209.0],
    '8': [852.0, 1336.0],
    '9': [852.0, 1477.0]
}

async function playTone(freq1, freq2, duration){
    dialTone(freq1, freq2);
    await release(duration);
}

async function playSequence(){
    var sequence = [
        { tone: '3', duration: short},
        { tone: '2', duration: short},
        { tone: '1', duration: short},
        { tone: '2', duration: short},
        { tone: '3', duration: short},
        { tone: '3', duration: short},
        { tone: '3', duration: long},
        { tone: '2', duration: short},
        { tone: '2', duration: short},
        { tone: '2', duration: long},
        { tone: '9', duration: short},
        { tone: '9', duration: short},
        { tone: '9', duration: long},
        { tone: '3', duration: short},
        { tone: '2', duration: short},
        { tone: '1', duration: short},
        { tone: '2', duration: short},
        { tone: '3', duration: short},
        { tone: '3', duration: short},
        { tone: '3', duration: short},
        { tone: '3', duration: short},
        { tone: '2', duration: short},
        { tone: '2', duration: short},
        { tone: '3', duration: short},
        { tone: '2', duration: short},
        { tone: '1', duration: short}
    ];
 
    for (var { tone, duration } of sequence) {
        var [freq1, freq2] = tones[tone];
        await playTone(freq1, freq2, duration);
    }
}

playSequence();