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index.html
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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=1280" />
<meta http-equiv="cache-control" content="max-age=0" />
<meta http-equiv="cache-control" content="no-cache" />
<meta http-equiv="expires" content="0" />
<meta http-equiv="expires" content="Tue, 01 Jan 1980 1:00:00 GMT" />
<meta http-equiv="pragma" content="no-cache" />
<title>BPM Heart Rate Monitor by seanwasere ytbe</title>
<link href='https://fonts.googleapis.com/css?family=Nova+Square' rel='stylesheet' type='text/css'>
<style>
BODY {
margin: 0px;
padding: 0px;
font-family: Arial, Helvetica, sans-serif;
background-color: white;
color: black;
font-size: 24px;
}
#scope {
position: absolute;
top: 10px;
left: 10px;
}
#scope2 {
position: absolute;
top: 272px;
left: 10px;
}
#scope3 {
position: absolute;
top: 534px;
left: 10px;
}
#bpmDisplay {
position: absolute;
top: 10px;
left: 1040px;
width: 300px;
height: 256px;
}
#recordLengthDisplay {
position: absolute;
top: 272px;
left: 1096px;
width: 244px;
height: 256px;
}
#bpmTriggerSlider {
position: absolute;
top: 103px;
left: 0px;
}
.slider-wrapper {
position: absolute;
left: 1040px;
top: 272px;
width: 50px;
height: 256px;
padding: 0;
background-color: orangered
}
.slider-wrapper input {
width: 250px;
height: 50px;
margin: 0;
transform-origin: 75px 75px;
transform: rotate(-90deg);
}
/* #bpmCutoff {
position: absolute;
top: 262px;
left: 0px;
width: 1024px;
height: 256px;
*/
/* border: 1px solid gray; */
/*cursor: pointer;
}
#bpmCutoffSlider {
height: 4px;
width: 1024px;
left: 10px;
background: rgba(0, 255, 0, 0.75);
position: relative;
pointer-events: none;
} */
.startButton {
width: 300px;
height: 50px;
background-color: orangered;
border: 1px solid;
color: black;
font-size: 32px;
}
#resetBeatCounterBtn {
position: absolute;
top: 534px;
left: 1040px;
width: 300px;
height: 50px;
background-color: red;
border: 1px solid;
color: black;
font-size: 32px;
}
#browserError {
position: absolute;
top: 600px;
left: 10px;
}
#micInputSelector {
position: absolute;
top: 620px;
left: 10px;
}
.modal {
display: block;
/* Hidden by default */
position: fixed;
/* Stay in place */
z-index: 1;
/* Sit on top */
left: 0;
top: 0;
width: 100%;
/* Full width */
height: 100%;
/* Full height */
overflow: auto;
/* Enable scroll if needed */
background-color: rgb(0, 0, 0);
/* Fallback color */
background-color: rgba(0, 0, 0, 0.6);
/* Black w/ opacity */
}
/* Modal Content/Box */
.modal-content {
background-color: #fefefe;
margin: 12% auto;
/* 15% from the top and centered */
padding: 20px;
border: 1px solid #888;
width: 60%;
/* Could be more or less, depending on screen size */
}
.modal-footer {
text-align: center;
}
/* The Close Button */
.close {
color: #aaa;
float: right;
font-size: 28px;
font-weight: bold;
}
.close:hover,
.close:focus {
color: black;
text-decoration: none;
cursor: pointer;
}
</style>
</head>
<body>
<canvas id='scope' width=1024 height=256></canvas>
<canvas id='bpmDisplay' width=300 height=256></canvas>
<canvas id='scope2' width=1024 height=256></canvas>
<canvas id='recordLengthDisplay' width=244 height=256></canvas>
<div class="slider-wrapper">
<input id="bpmTriggerSlider" type="range" min="0" max="100" value="66" list="tickmarks">
</div>
<!-- <div id="bpmCutoff">
<div id="bpmCutoffSlider"></div>
</div> -->
<datalist id="tickmarks">
<option value="0" label="0%">
<option value="10">
<option value="20">
<option value="30">
<option value="40">
<option value="50" label="50%">
<option value="60">
<option value="70">
<option value="80">
<option value="90">
<option value="100" label="100%">
</datalist>
<canvas id='scope3' width=1024 height=50></canvas>
<button id="resetBeatCounterBtn" onclick="resetBeatCounter();">Reset BPM</button>
<div id="browserError" style="color:red;"></div>
<div id="myModal" class="modal">
<div class="modal-content">
<div class="modal-header">
<h2>BPM Heart Rate Monitor</h2>
</div>
<div class="modal-body">
<p>A quick and easy heart rate BPM monitor using HTML5 Audio</p>
<p>This appears to work best in FireFox browser</p>
<p>Plug a small microphone into one side of the tube attached to the stethoscope binaural, then plug the mic
into the pc, adjust sound card settings to listen.</p>
</div>
<div class="modal-footer">
<button class="startButton" onclick="connectAudioAPI();">START</button>
</div>
</div>
</div>
<script lang="javascript">
var AudioContext = window.AudioContext || window.webkitAudioContext || false;
var context;
var currentStream;
var gainNode;
var mediaSource, mediaBuffer, remoteDestination;
var analyser1;
var ctx, ctx2, ctx3, ctxBpmDisplay, ctxRecordLengthDisplay;
var maxHistory = [];
var bpmFlipTest;
var beats;
var bpm;
var lastBeatStart;
var scaling = 2;
window.onload = function () {
ctx = document.getElementById('scope').getContext('2d');
ctx2 = document.getElementById('scope2').getContext('2d');
ctx3 = document.getElementById('scope3').getContext('2d');
ctxBpmDisplay = document.getElementById('bpmDisplay').getContext('2d');
ctxRecordLengthDisplay = document.getElementById('recordLengthDisplay').getContext('2d');
for (var x = 0; x < 1024; x++) {
maxHistory.push(128);
}
bpmFlipTest = false;
beats = [];
bpm = 0;
lastBeatStart = Date.now();
}
function error(e) {
console.dir(e);
}
function getUserMedia(dictionary, callback) {
try {
navigator.getUserMedia =
navigator.getUserMedia ||
navigator.webkitGetUserMedia ||
navigator.mozGetUserMedia;
navigator.getUserMedia(dictionary, callback, error);
} catch (e) {
alert('getUserMedia threw exception :' + e);
}
}
function connectAudioAPI() {
try {
context = new AudioContext();
analyser1 = context.createAnalyser();
analyser1.fftSize = 2048;
navigator.mediaDevices.getUserMedia({ audio: true, video: false })
.then(function (stream) {
/* use the stream */
//console.dir(stream);
gotStream(stream);
})
.catch(function (err) {
/* handle the error */
alert(err);
});
} catch (e) {
alert(e);
}
}
function gotStream(stream) {
//console.dir(stream);
try {
beats = [];
mediaSource = context.createMediaStreamSource(stream);
mediaSource.connect(analyser1);
myModal.style.display = "none";
draw();
} catch (e) {
console.dir(e);
}
}
function resetBeatCounter() {
beats = [];
}
function drawScope() {
var timeData1 = new Uint8Array(analyser1.frequencyBinCount);
analyser1.getByteTimeDomainData(timeData1);
ctx.fillStyle = 'rgba(0, 0, 0, 1)';
ctx.fillRect(0, 0, ctx.canvas.width, ctx.canvas.height);
ctx.shadowBlur = 20;
ctx.shadowColor = "rgb(0, 256, 0)";
ctx.beginPath();
ctx.lineWidth = 3;
ctx.strokeStyle = 'rgb(0, 256, 0)';
//ctx.beginPath();
var max = 0;
for (var x = 0; x < timeData1.length; x++) {
//ctx.lineTo(timeData1[x] * scaling, height - timeData2[x] * scaling);
ctx.lineTo(x, 384 - timeData1[x] * scaling);
var t = Math.abs(timeData1[x]);
if (t > max) {
max = t;
}
}
ctx.stroke();
maxHistory.push(max);
if (maxHistory.length > 1024) {
maxHistory.shift();
}
ctx2.fillStyle = 'rgba(0, 0, 0, 1)';
ctx2.fillRect(0, 0, ctx2.canvas.width, ctx2.canvas.height);
ctx2.beginPath();
var cutOffY = 256 - (ctx2.canvas.height * bpmTriggerSlider.value / 100)
ctx2.fillStyle = 'rgba(255, 0, 0, .2)';
ctx2.fillRect(0, 0, 1024, cutOffY);
ctx2.lineWidth = 3;
ctx2.shadowBlur = 20;
ctx2.shadowColor = "blue";
ctx2.strokeStyle = 'orangered';
ctx2.lineTo(0, cutOffY);
ctx2.lineTo(1024, cutOffY);
ctx2.stroke();
ctx2.shadowColor = "blue";
ctx2.beginPath();
ctx2.lineWidth = 3;
ctx2.strokeStyle = 'blue';
//var beats = [];
for (var x = 0; x < 1024; x++) {
var y = 1000 - (maxHistory[x] * 6);
ctx2.lineTo(x, y);
if (x === 1023) {
if (y < cutOffY) {
if (!bpmFlipTest) {
bpmFlipTest = true;
//bpm += 1;
beats.push(Date.now());
lastBeatStart = Date.now();
}
}
if (y > cutOffY && lastBeatStart < Date.now() - 250) {
bpmFlipTest = false;
}
}
}
ctx2.stroke();
beats.forEach(b => {
if (b < Date.now() - 60500) {
beats.shift();
}
});
var beatsZeroTime = Date.now();
if (beats[0]) {
beatsZeroTime = beats[0];
}
var beatsRecordingDuration = Date.now() - beatsZeroTime;
ctx3.fillStyle = 'rgba(0, 0, 0, 1)';
ctx3.fillRect(0, 0, 1024, 50);
ctx3.lineWidth = 3;
ctx3.shadowBlur = 20;
ctx3.shadowColor = "GoldenRod";
ctx3.strokeStyle = 'GoldenRod';
var beatCount = beats.length;
var dNow = Date.now();
for (var x = 0; x < beatCount; x++) {
var offsetX = 1024 + ((beats[x] - dNow) / 59);
if (x === 0) {
ctx3.fillStyle = 'rgba(255, 0, 0, .2)';
ctx3.fillRect(offsetX, 0, 1100, 50);
}
ctx3.beginPath();
ctx3.lineTo(offsetX, 2);
ctx3.lineTo(offsetX, 48);
ctx3.stroke();
}
//ctx3.stroke();
ctxBpmDisplay.fillStyle = 'rgba(0, 0, 0, 1)';
ctxBpmDisplay.fillRect(0, 0, ctxBpmDisplay.canvas.width, ctxBpmDisplay.canvas.height);
ctxBpmDisplay.font = "italic 152px Nova Square";
ctxBpmDisplay.textAlign = "left";
ctxBpmDisplay.shadowBlur = 0;
//ctxBpmDisplay.fillStyle = 'rgba(255, 69, 0, .5)';
ctxBpmDisplay.fillStyle = 'rgba(128, 128, 128, 1.0)';
ctxBpmDisplay.fillText(parseInt(bpm), 4, 230);
ctxRecordLengthDisplay.fillStyle = 'rgba(0, 0, 0, 1)';
ctxRecordLengthDisplay.fillRect(0, 0, ctxRecordLengthDisplay.canvas.width, ctxRecordLengthDisplay.canvas.height);
ctxRecordLengthDisplay.font = "italic 72px Nova Square";
ctxRecordLengthDisplay.textAlign = "left";
ctxRecordLengthDisplay.shadowBlur = 0;
ctxRecordLengthDisplay.fillStyle = 'rgba(128, 128, 128, 1.0)';
var seconds = ((beatsRecordingDuration) / 1000).toFixed(2);
ctxRecordLengthDisplay.fillText(seconds, 10, 230);
if (beatCount !== 0) {
bpm = beatCount * (60 / seconds);
} else {
bpm = 0;
}
}
function draw() {
drawScope();
requestAnimationFrame(draw);
}
</script>
</body>
</html>