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oscilloscope.html
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<!DOCTYPE html>
<html lang='en'>
<head>
<title>Esp32_oscilloscope</title>
<meta charset='UTF-8'>
<meta http-equiv='X-UA-Compatible' content='IE=edge'>
<link rel='shortcut icon' type='image/x-icon' sizes='192x192' href='/android-192-osc.png'>
<link rel='icon' type='image/png' sizes='192x192' href='/android-192-osc.png'>
<link rel='apple-touch-icon' sizes='180x180' href='/apple-180-osc.png'>
<style>
hr {border: 0; border-top: 1px solid lightgray; border-bottom: 1px solid lightgray}
h1 {font-family: verdana; font-size: 40px; text-align: center}
/* define grid for controls - we'll use d2 + d3 + d4 = 100% or d2 + d3 + d3 + d5 = 100% */
div.d1 {position: relative; width: 100%; height: 48px; font-family: verdana; font-size: 16px; color: hsl(0, 100%, 40%);}
div.d2 {position: relative; float: left; width: 42%; font-family: verdana; font-size: 30px; color: gray;}
div.d3 {position: relative; float: left; width: 16%; font-family: verdana; font-size: 30px; color: black;}
div.d4 {position: relative; float: left; width: 42%; font-family: verdana; font-size: 30px; color: gray;}
div.d5 {position: relative; float: left; width: 26%;}
/* select control */
select {padding: 8px 24px; border-radius: 12px; font-size: 16px; color: black; background-color: #eee; -webkit-appearance: none; -moz-appearance: none; box-sizing: border-box; border: 3px solid #ccc; -webkit-transition: 0.5s; transition: 0.5s; outline: none}
select::-ms-expand {display: none}
select:disabled {background-color: #aaa}
/* radio button control */
.container {display: black; position: relative; padding-left: 222px; margin-bottom: 14px; cursor: pointer; font-family: verdana; font-size: 30px; color: gray; -webkit-user-select: none; -moz-user-select: none; -ms-user-select: none; user-select: none}
.container input {position: absolute; opacity: 0; cursor: pointer; height: 0; width: 0}
.checkmark {position: absolute; top: 0; left: 0; height: 34px; width: 34px; background-color: #ddd; border-radius: 50%}
.container:hover input ~ .checkmark {background-color: #ccc}
.container input:checked ~ .checkmark {background-color: hsl(207, 90%, 20%) }
.checkmark:after {content: ''; position: absolute; display: none}
.container input:checked ~ .checkmark:after {display: block}
.container .checkmark:after {top: 9px; left: 9px; width: 15px; height: 15px; border-radius: 50%; background: white}
.container input:disabled ~ .checkmark {background-color: gray}
.container input:disabled ~ .checkmark {background-color: #aaa}
/* slider control */
input[type='range'] {-webkit-appearance: none; -webkit-tap-highlight-color: rgba(255,255,255,0); width: 94%; height: 28px; margin: 0; border: none; padding: 4px 4px; border-radius: 28px; background: hsl(82, 90%, 30%); outline: none}
input[type='range']::-moz-range-track {border: inherit; background: transparent}
input[type='range']::-ms-track {border: inherit; color: transparent; background: transparent}
input[type='range']::-ms-fill-lower
input[type='range']::-ms-fill-upper {background: transparent}
input[type='range']::-ms-tooltip {display: none}
input[type='range']::-webkit-slider-thumb {-webkit-appearance: none; width: 38px; height: 26px; border: none; border-radius: 13px; background-color: white}
input[type='range']::-moz-range-thumb {width: 38px; height: 26px; border: none; border-radius: 13px; background-color: white}
input[type='range']::-ms-thumb {width: 38px; height: 26px; border-radius: 13px; border: 0; background-color: white}
input:disabled+.slider {background-color: #aaa}
input[type='range']:disabled {background: #aaa}
/* switch control */
.switch {position: relative; display: inline-block; width: 60px; height: 34px}
.slider {position: absolute; cursor: pointer; top: 0; left: 0; right: 0; bottom: 0; background-color: #ccc; -webkit-transition: .4s; transition: .4s}
.slider:before {position: absolute; content: ''; height: 26px; width: 26px; left: 4px; bottom: 4px; background-color: white; -webkit-transition: .4s; transition: .4s}
input:checked+.slider {background-color: hsl(82, 90%, 30%) }
input:focus+.slider {box-shadow: 0 0 1px hsl(82, 90%, 30%) }
input:checked+.slider:before {-webkit-transform: translateX(26px); -ms-transform: translateX(26px); transform: translateX(26px)}
.switch input {display: none}
.slider.round {border-radius: 34px}
.slider.round:before {border-radius: 50%}
input:disabled+.slider {background-color: #aaa}
/* button control */
.button {padding: 10px 15px; font-size: 22px;text-align: center; cursor: pointer; outline: none; color: white; border: none; border-radius: 12px; box-shadow: 1px 1px #ccc; position: relative; top: 0px; height: 42px}
button:disabled {background-color: #aaa}
button:disabled:hover {background-color: #aaa}
/* blue button */
.button1 {background-color: hsl(207, 90%, 40%) }
.button1:hover {background-color: hsl(207, 90%, 30%) }
.button1:active {background-color: hsl(207, 90%, 30%); transform: translateY(3px)}
/* green button */
.button2 {background-color: hsl(82, 90%, 25%) }
.button2:hover {background-color: hsl(82, 90%, 20%) }
.button2:active {background-color: hsl(82, 90%, 20%); transform: translateY(3px)}
/* red button */
.button3 {background-color: hsl(0, 100%, 25%) }
.button3:hover {background-color: hsl(0, 100%, 20%) }
.button3:active {background-color: hsl(0, 100%, 20%); transform: translateY(3px)}
</style>
<script type='text/javascript'>
// DEFINE VALID DIGITAL INPUT GPIOs HERE OR LEAVE EMPTY STRING FOR ALL (note that validAnalogInputs will also prevent digitalReading of listed GPIOs)
var validDigitalInputs = '';
// DEFINE VALID ANALOG INPUT GPIOs HERE OR LEAVE EMPTY STRING FOR ALL
var validAnalogInputs = '36,37,38,39,32,33,34,35';
// from: https://www.w3schools.com/js/js_cookies.asp
function getCookie (cname) {
var name = cname + '=';
var decodedCookie = decodeURIComponent (document.cookie);
var ca = decodedCookie.split (';');
for (var i = 0; i < ca.length; i++) {
var c = ca [i];
while (c.charAt (0) == ' ') {
c = c.substring (1);
}
if (c.indexOf (name) == 0) {
return c.substring (name.length, c.length);
}
}
return '';
}
// from: https://www.w3schools.com/js/js_cookies.asp
function setCookie (cname, cvalue, exdays) {
var d = new Date ();
d.setTime (d.getTime () + (exdays * 24 * 60 * 60 * 1000));
var expires = 'expires=' + d.toUTCString ();
document.cookie = cname + '=' + cvalue + ';' + expires + ';' // path=/'; we wont use path - cookies are used in this page only
}
</script>
</head>
<body>
<br><h1>ESP32 oscilloscope</h1>
<div class='d1'>Please customize this file, oscilloscope.html, to suit your project needs.
Initialize the validDigitalInputs and validAnalogInputs variables with the
lists of GPIOs that are valid for your project for example.</div>
<hr />
<div class='d1' style='height: 50px;'>
<div class='d2'> ESP32 GPIOs <small><small>(1, 2)</small></div>
<div class='d3' style='color: gray;'>
<select id='gpio1'>
<option value='1'>GPIO 1</option><option value='2' selected='selected'>GPIO 2</option><option value='3'>GPIO 3</option><option value='4'>GPIO 4</option><option value='5'>GPIO 5</option>
<option value='12'>GPIO 12</option><option value='13'>GPIO 13</option><option value='14'>GPIO 14</option><option value='15'>GPIO 15</option><option value='16'>GPIO 16</option>
<option value='17'>GPIO 17</option><option value='18'>GPIO 18</option><option value='19'>GPIO 19</option><option value='21'>GPIO 21</option><option value='22'>GPIO 22</option>
<option value='23'>GPIO 23</option><option value='25'>GPIO 25</option><option value='26'>GPIO 26</option><option value='27'>GPIO 27</option><option value='32'>GPIO 32</option>
<option value='33'>GPIO 33</option><option value='34'>GPIO 34</option><option value='35'>GPIO 35</option><option value='36'>GPIO 36</option><option value='39'>GPIO 39</option>
</select>
</div>
<div class='d3' style='color: gray;'>
<select id='gpio2'>
<option value='40' selected='selected'></option>
<option value='1'>GPIO 1</option><option value='2'>GPIO 2</option><option value='3'>GPIO 3</option><option value='4'>GPIO 4</option><option value='5'>GPIO 5</option>
<option value='12'>GPIO 12</option><option value='13'>GPIO 13</option><option value='14'>GPIO 14</option><option value='15'>GPIO 15</option><option value='16'>GPIO 16</option>
<option value='17'>GPIO 17</option><option value='18'>GPIO 18</option><option value='19'>GPIO 19</option><option value='21'>GPIO 21</option><option value='22'>GPIO 22</option>
<option value='23'>GPIO 23</option><option value='25'>GPIO 25</option><option value='26'>GPIO 26</option><option value='27'>GPIO 27</option><option value='32'>GPIO 32</option>
<option value='33'>GPIO 33</option><option value='34'>GPIO 34</option><option value='35'>GPIO 35</option><option value='36'>GPIO 36</option><option value='39'>GPIO 39</option>
</select>
</div>
</div>
<hr />
<div class='d1'>
<div class='d2'> digitalRead (GPIO)</div>
<div class='d3'>
<label class='container'> <input type='radio' checked='checked' name='radio1' id='digital' onchange="
drawBackgroundAndCalculateParameters ();
document.getElementById ('sensitivity').disabled = true;
document.getElementById ('sensitivityLabel').style.color = 'gray';
document.getElementById ('position').disabled = true;
document.getElementById ('positionLabel').style.color = 'gray';
document.getElementById ('posTreshold').disabled = true;
document.getElementById ('posTriggerLabel').style.color = 'gray';
document.getElementById ('negTreshold').disabled = true;
document.getElementById ('negTriggerLabel').style.color = 'gray';
"><span class='checkmark'></span></label>
</div>
</div>
<div class='d1'>
<div class='d2'> analogRead (GPIO)</div>
<div class='d3'>
<label class='container'> <input type='radio' name='radio1' id='analog' onchange="
drawBackgroundAndCalculateParameters ();
document.getElementById ('sensitivity').disabled = false;
document.getElementById ('sensitivityLabel').style.color = 'black';
document.getElementById ('position').disabled = false;
document.getElementById ('positionLabel').style.color = 'black';
document.getElementById ('posTreshold').disabled = false;
document.getElementById ('posTriggerLabel').style.color = 'black';
document.getElementById ('negTreshold').disabled = false;
document.getElementById ('negTriggerLabel').style.color = 'black';
"><span class='checkmark'></span></label>
</div>
</div>
<hr />
<div class='d1' id='vSens'>
<div class='d2'> Vertical sensitivity</div>
<div class='d3' id='sensitivityLabel'>100 %</div>
<div class='d5'>
<input id='sensitivity' type='range' min='0' max='5' value='0' step='1' disabled onchange="
document.getElementById ('sensitivityLabel').textContent = sensitivityLabelFromSensitivitySlider (this.value);
drawBackgroundAndCalculateParameters ();
" />
</div>
</div>
<div class='d1' id='vPos'>
<div class='d2'> Vertical position</div>
<div class='d3' id='positionLabel'>0</div>
<div class='d5'>
<input id='position' type='range' min='0' max='4000' value='0' step='100' disabled onchange="
document.getElementById ('positionLabel').textContent = this.value;
drawBackgroundAndCalculateParameters ();
" />
</div>
</div>
<hr />
<div class='d1'>
<div class='d2'> Trigger on ↗ slope <small><small>(1)</small></small></div>
<div class='d3'>
<label class='switch'><input type='checkbox' id='posTrigger'><div class='slider round'></div></label>
</div>
<div class='d3' id='posTriggerLabel'>on 1000</div>
<div class='d5'>
<input id='posTreshold' type='range' min='1' max='4095' value='1000' step='1' disabled onchange="
document.getElementById ('posTriggerLabel').textContent = 'on ' + this.value;
document.getElementById ('posTrigger').checked = true;
" />
</div>
</div>
<div class='d1'>
<div class='d2'> Trigger on ↘ slope <small><small>(1)</small></small></div>
<div class='d3'>
<label class='switch'><input type='checkbox' id='negTrigger'><div class='slider round'></div></label>
</div>
<div class='d3' id='negTriggerLabel'>on 3000</div>
<div class='d5'>
<input id='negTreshold' type='range' min='0' max='4094' value='3000' step='1' disabled onchange="
document.getElementById('negTriggerLabel').textContent = 'on ' + this.value;
document.getElementById('negTrigger').checked = true;
" />
</div>
</div>
<hr />
<div class='d1'>
<div class='d2'> Horizontal frequency</div>
<div class='d3' id='frequencyLabel'>1 KHz</div>
<div class='d5'>
<input id='frequency' type='range' min='1' max='17' value='14' step='1' onchange="
document.getElementById ('frequencyLabel').textContent = frequencyLabelFromFrequencySlider (this.value);
drawBackgroundAndCalculateParameters ();
" />
</div>
</div>
<hr />
<div class='d1'>
<div class='d2'> Connect samples</div>
<div class='d3'>
<label class='switch'><input type='checkbox' checked id='lines' onclick="
if (!this.checked) document.getElementById ('markers').checked = true;
"><div class='slider round'></div></label>
</div>
</div>
<div class='d1'>
<div class='d2'> Mark samples</div>
<div class='d3'>
<label class='switch'><input type='checkbox' checked id='markers' onclick="
if (!this.checked) document.getElementById ('lines').checked = true;
"><div class='slider round'></div></label>
</div>
</div>
<hr />
<div class='d1'>
<div class='d2'> Remember settings</div>
<div class='d3'>
<label class='switch'><input type='checkbox' id='remember' onclick="
saveSettings ();
"><div class='slider round'></div></label>
</div>
<div class='d4'> <small><small>(uses cookies)</small></small></div>
</div>
<hr />
<div class='d1'>
<div class='d2'> </div>
<div class='d3'><button class='button button2' id='startButton' onclick="
if (document.getElementById ('analog').checked && validAnalogInputs != '' && (',' + validAnalogInputs + ',').indexOf (',' + document.getElementById ('gpio1').value + ',') == -1) {
alert ('Cannot analogRead GPIO ' + document.getElementById ('gpio1').value + '.');
} else if (document.getElementById ('analog').checked && document.getElementById ('gpio2').value != '40' && validAnalogInputs != '' && (',' + validAnalogInputs + ',').indexOf (',' + document.getElementById ('gpio2').value + ',') == -1) {
alert ('Cannot analogRead GPIO ' + document.getElementById ('gpio2').value + '.');
} else if (document.getElementById ('digital').checked && (validDigitalInputs != '' && (',' + validDigitalInputs + ',').indexOf (',' + document.getElementById ('gpio1').value + ',') == -1 || (',' + validAnalogInputs + ',').indexOf (',' + document.getElementById ('gpio1').value + ',') > -1)) {
alert ('Cannot digitalRead GPIO ' + document.getElementById ('gpio1').value + '.');
} else if (document.getElementById ('digital').checked && (document.getElementById ('gpio2').value != '40' && validDigitalInputs != '' && (',' + validDigitalInputs + ',').indexOf (',' + document.getElementById ('gpio2').value + ',') == -1 || (',' + validAnalogInputs + ',').indexOf (',' + document.getElementById ('gpio2').value + ',') > -1)) {
alert ('Cannot digitalRead GPIO ' + document.getElementById ('gpio2').value + '.');
} else {
saveSettings ();
drawBackgroundAndCalculateParameters ();
enableDisableControls (true);
startOscilloscope ();
}
"> START </button></div>
<div class='d4'><button class='button button3' id='stopButton' disabled onclick="
stopOscilloscope ();
enableDisableControls (false);
"> STOP </button></div>
</div>
<br>
<canvas id='oscilloscope' width='968' height='512'></canvas></div>
<script type='text/javascript'>
var lastWidth = 0;
var currentWidth = document.documentElement.clientWidth;
window.addEventListener ('resize', (e) => {
currentWidth = document.documentElement.clientWidth;
// if oscilloscope is not running we can resize and redraw canvas right now
if (document.getElementById ('stopButton').disabled == true) drawBackgroundAndCalculateParameters ();
});
// correct canvas size
function resizeCanvas () {
if (lastWidth != currentWidth) {
document.getElementById ('oscilloscope').width = document.getElementById ('vSens').clientWidth;
lastWidth = currentWidth;
}
}
resizeCanvas ();
// initialization
function sensitivityLabelFromSensitivitySlider (value) {
switch (value) {
case '0': return '100 %';
case '1': return '200 %';
case '2': return '400 %';
case '3': return '1000 %';
case '4': return '2000 %';
case '5': return '4000 %';
}
}
function frequencyLabelFromFrequencySlider (value) {
switch (value) {
case '1': return '0,1 Hz';
case '2': return '0,2 Hz';
case '3': return '0,5 Hz';
case '4': return '1 Hz';
case '5': return '2 Hz';
case '6': return '5 Hz';
case '7': return '10 Hz';
case '8': return '20 Hz';
case '9': return '50 Hz';
case '10': return '60 Hz';
case '11': return '100 Hz';
case '12': return '200 Hz';
case '13': return '500 Hz';
case '14': return '1 KHz';
case '15': return '2 KHz';
case '16': return '5 KHz';
case '17': return '10 KHz';
}
}
// console.log (document.cookie);
var v;
v = getCookie ('gpio1'); if (v != '') document.getElementById ('gpio1').value = v;
v = getCookie ('gpio2'); if (v != '') document.getElementById ('gpio2').value = v;
v = getCookie ('analog'); if (v == 'true') document.getElementById ('analog').checked = true; else document.getElementById ('digital').checked = true;
v = getCookie ('sensitivity'); if (v != '') { document.getElementById ('sensitivity').value = v; document.getElementById ('sensitivityLabel').textContent = sensitivityLabelFromSensitivitySlider (v); }
v = getCookie ('position'); if (v != '') { document.getElementById ('position').value = v; document.getElementById ('positionLabel').textContent = v;}
v = getCookie ('posTrigger'); if (v == 'true') document.getElementById ('posTrigger').checked = true;
v = getCookie ('posTreshold'); if (v != '') { document.getElementById ('posTreshold').value = v; document.getElementById ('posTriggerLabel').textContent = 'on ' + v; }
v = getCookie ('negTrigger'); if (v == 'true') document.getElementById ('negTrigger').checked = true;
v = getCookie ('negTreshold'); if (v != '') { document.getElementById ('negTreshold').value = v; document.getElementById ('negTriggerLabel').textContent = 'on ' + v; }
v = getCookie ('frequency'); if (v != '') { document.getElementById ('frequency').value = v; document.getElementById ('frequencyLabel').textContent = frequencyLabelFromFrequencySlider (v); }
v = getCookie ('lines'); if (v == 'false') document.getElementById ('lines').checked = false;
v = getCookie ('markers'); if (v == 'false') document.getElementById ('markers').checked = false;
v = getCookie ('remember'); if (v == 'true') document.getElementById ('remember').checked = true;
enableDisableControls (false);
// save settings into cookies
function saveSettings () {
if (document.getElementById ('remember').checked) {
// set cookies for 10 years
setCookie ('gpio1', document.getElementById ('gpio1').value, 3652);
setCookie ('gpio2', document.getElementById ('gpio2').value, 3652);
setCookie ('analog', document.getElementById ('analog').checked, 3652);
setCookie ('sensitivity', document.getElementById ('sensitivity').value, 3652);
setCookie ('position', document.getElementById ('position').value, 3652);
setCookie ('posTrigger', document.getElementById ('posTrigger').checked, 3652);
setCookie ('posTreshold', document.getElementById ('posTreshold').value, 3652);
setCookie ('negTrigger', document.getElementById ('negTrigger').checked, 3652);
setCookie ('negTreshold', document.getElementById ('negTreshold').value, 3652);
setCookie ('frequency', document.getElementById ('frequency').value, 3652);
setCookie ('lines', document.getElementById ('lines').checked, 3652);
setCookie ('markers', document.getElementById ('markers').checked, 3652);
setCookie ('remember', document.getElementById ('remember').checked, 3652);
} else {
// delete cookies
setCookie ('gpio1', '', -1);
setCookie ('gpio2', '', -1);
setCookie ('analog', '', -1);
setCookie ('sensitivity', '', -1);
setCookie ('position', '', -1);
setCookie ('posTrigger', '', -1);
setCookie ('posTreshold', '', -1);
setCookie ('negTrigger', '', -1);
setCookie ('negTreshold', '', -1);
setCookie ('frequency', '', -1);
setCookie ('lines', '', -1);
setCookie ('markers', '', -1);
setCookie ('remember', '', -1);
}
}
var webSocket = null;
function stopOscilloscope () {
if (webSocket != null) {
webSocket.send ('stop');
webSocket.close ();
webSocket = null;
}
}
function startOscilloscope () {
stopOscilloscope ();
if ('WebSocket' in window) {
// open a web socket
var ws = new WebSocket ('ws://' + self.location.host + '/runOscilloscope');
webSocket = ws;
ws.onopen = function () {
// first send endian identification Uint16 so ESP32 server will know the client architecture
endianArray = new Uint16Array (1); endianArray [0] = 0xAABB;
ws.send (endianArray);
// then send start command with sampling parameters
var startCommand = "start " + (document.getElementById ("analog").checked ? "analog" : "digital") + " sampling on GPIO " + document.getElementById ("gpio1").value + (document.getElementById ("gpio2").value == 40 ? "" : ", " + document.getElementById ("gpio2").value) + " every ";
switch (document.getElementById ('frequency').value) {
// real sampling times will be passed back to browser in 16 bit integers -
// take care that values are <= 32767 !
// please note that oscilloscope reader can read max 128 samples per screen - this is how much samples fit in it buffer
// but this number may be significantly lower if ESP32 can not keep up to required sampling speed any more
// 1 sample at a time mode, measurements in ms
case '1': // screen width = 10 s => horizontal frequency = 0,1 Hz, 120 samples per screen => sampling interval = 83 ms, sampling frequency (single signal) = 12 Hz
startCommand += "83 ms screen width = 10000 ms";
break;
case '2': // screen width = 5 s => horizontal frequency = 0,2 Hz, 120 samples per screen => sampling interval = 42 ms, sampling frequency (single signal) = 24 Hz
startCommand += "42 ms screen width = 5000 ms";
break;
case '3': // screen width = 2 s => horizontal frequency = 0,5 Hz, 120 samples per screen => sampling interval = 17 ms, sampling frequency (single signal) = 60 Hz
startCommand += "17 ms screen width = 2000 ms";
break;
// screen at a time mode from now on
case '4': // screen width = 1 s => horizontal frequency = 1 Hz, 120 samples per screen => sampling interval = 8 ms, sampling frequency (single signal) = 125 Hz
startCommand += "8 ms screen width = 1000 ms";
break;
case '5': // screen width = 500 ms => horizontal frequency = 2 Hz, 120 samples per screen => sampling interval = 4 ms, sampling frequency (single signal) = 250 Hz
startCommand += "4 ms screen width = 500 ms";
break;
case '6': // screen width = 200 ms => horizontal frequency = 5 Hz, 100 samples per screen => sampling interval = 2 ms, sampling frequency (single signal) = 500 Hz
startCommand += "2 ms screen width = 200 ms";
break;
case '7': // screen width = 100 ms => horizontal frequency = 10 Hz, 100 samples per screen => sampling interval = 1 ms, sampling frequency (single signal) = 1000 Hz
startCommand += "1 ms screen width = 100 ms";
break;
// switch to measurements in us from now on
case '8': // screen width = 50 ms => horizontal frequency = 20 Hz, 100 samples per screen => sampling interval = 500 us, sampling frequency (single signal) = 2000 Hz
startCommand += "500 us screen width = 50000 us";
break;
case '9': // screen width = 20 ms => horizontal frequency = 50 Hz, 100 samples per screen => sampling interval = 200 us, sampling frequency (single signal) = 5000 Hz
startCommand += "200 us screen width = 20000 us";
break;
case '10': // screen width = 16 ms => horizontal frequency = 60 Hz, 100 samples per screen => sampling interval = 166 us, sampling frequency (single signal) = 5988 Hz
startCommand += "166 us screen width = 16667 us";
break;
case '11': // screen width = 10 ms => horizontal frequency = 100 Hz, 100 samples per screen => sampling interval = 100 us, sampling frequency (single signal) = 10000 Hz
startCommand += "100 us screen width = 10000 us";
break;
// ESP32 is having problems keeping up to increasing sampling speed, 50 us per (single) analog sample (100 us per dual analog sample or 20000 Hz), which is worst case scenario, is maximum it can handle
// reduce the number of samples per screen from now on
case '12': // screen width = 5 ms => horizontal frequency = 200 Hz, 100 samples per screen => sampling interval = 50 us, sampling frequency = 20000 Hz
if (document.getElementById ('analog').checked && document.getElementById ("gpio2").value != 40)
startCommand += "100 us screen width = 5000 us"; // reduce the sampling rate for dual analog reading
else
startCommand += "50 us screen width = 5000 us";
break;
case '13': // screen width = 2 ms => horizontal frequency = 500 Hz, 80 samples per screen => sampling interval = 25 us, sampling frequency = 40000 Hz
if (document.getElementById ('analog').checked)
if (document.getElementById ("gpio2").value != 40)
startCommand += "100 us screen width = 2000 us"; // reduce the sampling rate for dual analog reading
else
startCommand += "50 us screen width = 2000 us"; // reduce the sampling rate for dual analog reading
else
startCommand += "25 us screen width = 2000 us";
break;
case '14': // screen width = 1 ms => horizontal frequency = 1 kHz, 60 samples per screen => sampling interval = 16 us, sampling frequency = 58823 Hz
if (document.getElementById ('analog').checked)
if (document.getElementById ("gpio2").value != 40)
startCommand += "100 us screen width = 1000 us"; // reduce the sampling rate for dual analog reading
else
startCommand += "50 us screen width = 1000 us"; // reduce the sampling rate for dual analog reading
else
startCommand += "16 us screen width = 1000 us";
break;
case '15': // screen width = 500 us => horizontal frequency = 2 kHz, 25 samples per screen => sampling interval = 20 us, sampling frequency = 50000 Hz
if (document.getElementById ('analog').checked)
if (document.getElementById ("gpio2").value != 40)
startCommand += "100 us screen width = 500 us"; // reduce the sampling rate for dual analog reading
else
startCommand += "50 us screen width = 500 us"; // reduce the sampling rate for dual analog reading
else
startCommand += "8 us screen width = 500 us";
break;
case '16': // screen width = 200 us => horizontal frequency = 5 kHz, 30 samples per screen => sampling interval = 6 us, sampling frequency = 142000 Hz
if (document.getElementById ('analog').checked)
if (document.getElementById ("gpio2").value != 40)
startCommand += "100 us screen width = 200 us"; // let ESP32 do the best it can but this is far over its capabilities
else
startCommand += "50 us screen width = 200 us"; // let ESP32 do the best it can but this is far over its capabilities
else
startCommand += "6 us screen width = 200 us";
break;
case '17': // screen width = 100 us => horizontal frequency = 10 kHz, 20 samples per screen => sampling interval = 5 us, sampling frequency = 200000 Hz
if (document.getElementById ('analog').checked)
if (document.getElementById ("gpio2").value != 40)
startCommand += "100 us screen width = 100 us"; // let ESP32 do the best it can but this is far over its capabilities
else
startCommand += "50 us screen width = 100 us"; // let ESP32 do the best it can but this is far over its capabilities
else
startCommand += "5 us screen width = 100 us";
break;
}
if (document.getElementById ("posTrigger").checked) startCommand += " set positive slope trigger to " + (document.getElementById ("analog").checked ? document.getElementById ("posTreshold").value : 1);
if (document.getElementById ("negTrigger").checked) startCommand += " set negative slope trigger to " + (document.getElementById ("analog").checked ? document.getElementById ("negTreshold").value : 0);
ws.send (startCommand);
};
ws.onmessage = function (evt) {
if (typeof (evt.data) === 'string' || evt.data instanceof String) { // UTF-8 formatted string - error message from ESP32 server
alert ('Error message from server: ' + evt.data); // oscilloscope code reporting error (synatx error, ...)
enableDisableControls (false);
}
if (evt.data instanceof Blob) { // binary data - array of samples
// receive binary data as blob and then convert it into array buffer and draw oscilloscope signal
var myInt16Array = null;
var myArrayBuffer = null;
var myFileReader = new FileReader ();
myFileReader.onload = function (event) {
myArrayBuffer = event.target.result;
myInt16Array = new Int16Array (myArrayBuffer);
// console.log (myInt16Array);
drawSignal (myInt16Array, 0, myInt16Array.length - 1);
};
myFileReader.readAsArrayBuffer (evt.data);
}
};
ws.onclose = function () {
// websocket is closed.
console.log ('WebSocket closed.');
enableDisableControls (false);
};
ws.onerror = function (event) {
ws.close ();
alert ('WebSocket error: ' + event);
enableDisableControls (false);
};
} else {
alert ('WebSockets are not supported by your browser.');
}
}
// drawing parameters
var screenWidthTime; // oscilloscope screen width in time units
var restartDrawingSignal; // used for drawing the signal
var screenTimeOffset; // used for drawing the signal
var xOffset;
var xScale;
var yOffset;
var yScale;
var yLast;
function drawBackgroundAndCalculateParameters () {
resizeCanvas ();
var x; // x coordinate
var y; // y coordinate
var i; // x coordinate in canvas units
var j; // y coordinate in canas units
var yGridTick;
var gridTop; // y value at the top of the grid
restartDrawingSignal = true; // drawing parameter - for later use
screenTimeOffset = 0; // drawing parameter - for later use
var canvas = document.getElementById ('oscilloscope');
var ctx = canvas.getContext ('2d');
// colour background
ctx.fillStyle = 'hsl(82, 90%, 10%)';
ctx.beginPath ();
ctx.moveTo (0, 0);
ctx.lineTo (canvas.width - 1, 0);
ctx.lineTo (canvas.width - 1, canvas.height - 1);
ctx.lineTo (0, canvas.height - 1);
ctx.fill ();
// calculate drawing parametes and draw grid and scale
ctx.strokeStyle = 'hsl(82, 90%, 40%)';
ctx.lineWidth = 3;
ctx.font = '16px Verdana';
xOffset = 50;
// draw analog signal grid
if (document.getElementById ('analog').checked) {
// signal sensitivity
yScale = -(canvas.height - 60) / 4096;
yGridTick = 1000;
switch (document.getElementById ('sensitivity').value) {
case '0': yScale *= 1; break;
case '1': yScale *= 2; break;
case '2': yScale *= 4; yGridTick = 200; break;
case '3': yScale *= 8; yGridTick = 200; break;
case '4': yScale *= 10; yGridTick = 100; break;
case '5': yScale *= 20; yGridTick = 100; break;
}
yOffset = canvas.height - 50 - parseInt (document.getElementById ('position').value) * yScale;
gridTop = yOffset + yScale * 4095 + 5;
// draw horizontal grid and scale
for (y = 0; y < 4096; y += yGridTick) {
j = yOffset + yScale * y;
ctx.strokeText (y.toString (), 5, j + 5);
ctx.beginPath ();
ctx.moveTo (xOffset - 5, j);
ctx.lineTo (canvas.width, j);
ctx.stroke ();
}
// draw digital signal grid
} else {
yOffset = canvas.height - 100;
yScale = -(canvas.height - 200);
for (y = 0; y <= 1; y += 0.333333) {
j = yOffset + yScale * y;
ctx.beginPath ();
ctx.moveTo (xOffset - 5, j);
ctx.lineTo (canvas.width, j);
ctx.stroke ();
}
ctx.strokeText ('0', 5, yOffset + 5);
ctx.strokeText ('1', 5, yOffset + yScale * 1 + 5);
gridTop = yOffset + yScale * 1 - 25;
}
// draw vertical grid and scale
switch (document.getElementById ('frequency').value) {
case '1': screenWidthTime = 10000; // (ms) horizontal frequency = 0,1 Hz, whole width = 10 s, grid tick width = 1 s
xGridTick = screenWidthTime / 10;
xScale = (canvas.width - xOffset) / screenWidthTime;
xLabel = '1 s';
break;
case '2': screenWidthTime = 5000; // (ms) horizontal frequency = 0,2 Hz, whole width = 5 s, grid tick width = 0,5 s
xGridTick = screenWidthTime / 10;
xScale = (canvas.width - xOffset) / screenWidthTime;
xLabel = '500 ms';
break;
case '3': screenWidthTime = 2000; // (ms) horizontal frequency = 0,5 Hz, whole width = 2 s, grid tick width = 0,2 s
xGridTick = screenWidthTime / 10;
xScale = (canvas.width - xOffset) / screenWidthTime;
xLabel = '200 ms';
break;
case '4': screenWidthTime = 1000; // (ms) horizontal frequency = 1 Hz, whole width = 1 s, grid tick width = 0,1 s
xGridTick = screenWidthTime / 10;
xScale = (canvas.width - xOffset) / screenWidthTime;
xLabel = '100 ms';
break;
case '5': screenWidthTime = 500000; // (us) horizontal frequency = 2 Hz, whole width = 0,5 s, grid tick width = 0,05 s
xGridTick = screenWidthTime / 10;
xScale = (canvas.width - xOffset) / screenWidthTime;
xLabel = '50 ms';
break;
case '6': screenWidthTime = 200000; // (us) horizontal frequency = 5 Hz, whole width = 0,2 s, grid tick width = 0,02 s
xGridTick = screenWidthTime / 10;
xScale = (canvas.width - xOffset) / screenWidthTime;
xLabel = '20 ms';
break;
case '7': screenWidthTime = 100000; // (us) horizontal frequency = 10 Hz, whole width = 0,1 s, grid tick width = 0,01 s
xGridTick = screenWidthTime / 10;
xScale = (canvas.width - xOffset) / screenWidthTime;
xLabel = '10 ms';
break;
case '8': screenWidthTime = 50000; // (us) horizontal frequency = 20 Hz, whole width = 0,05 s, grid tick width = 0,005 s
xGridTick = screenWidthTime / 10;
xScale = (canvas.width - xOffset) / screenWidthTime;
xLabel = '5 ms';
break;
case '9': screenWidthTime = 20000; // horizontal frequency = 50 Hz, whole width = 0,02 s, grid tick width = 0,002 s
xGridTick = screenWidthTime / 10;
xScale = (canvas.width - xOffset) / screenWidthTime;
xLabel = '2 ms';
break;
case '10': screenWidthTime = 17000; // horizontal frequency = 60 Hz, whole width = 0,017 s, grid tick width = 0,002 s
xGridTick = 2000;
xScale = (canvas.width - xOffset) / screenWidthTime;
xLabel = '2 ms';
break;
case '11': screenWidthTime = 10000; // horizontal frequency = 100 Hz, whole width = 0,01 s, grid tick width = 0,001 s
xGridTick = screenWidthTime / 10;
xScale = (canvas.width - xOffset) / screenWidthTime;
xLabel = '1 ms';
break;
case '12': screenWidthTime = 5000; // horizontal frequency = 200 Hz, whole width = 0,005 s, grid tick width = 0,0005 s
xGridTick = screenWidthTime / 10;
xScale = (canvas.width - xOffset) / screenWidthTime;
xLabel = '500 us';
break;
case '13': screenWidthTime = 2000; // horizontal frequency = 500 Hz, whole width = 0,002 s, grid tick width = 0,0002 s
xGridTick = screenWidthTime / 10;
xScale = (canvas.width - xOffset) / screenWidthTime;
xLabel = '200 us';
break;
case '14': screenWidthTime = 1000; // horizontal frequency = 1000 Hz, whole width = 0,001 s, grid tick width = 0,0001 s
xGridTick = screenWidthTime / 10;
xScale = (canvas.width - xOffset) / screenWidthTime;
xLabel = '100 us';
break;
case '15': screenWidthTime = 500; // horizontal frequency = 2000 Hz, whole width = 0,00005 s, grid tick width = 0,00005 s
xGridTick = screenWidthTime / 10;
xScale = (canvas.width - xOffset) / screenWidthTime;
xLabel = '50 us';
break;
case '16': screenWidthTime = 200; // horizontal frequency = 5000 Hz, whole width = 0,00002 s, grid tick width = 0,00002 s
xGridTick = screenWidthTime / 10;
xScale = (canvas.width - xOffset) / screenWidthTime;
xLabel = '20 us';
break;
case '17': screenWidthTime = 100; // horizontal frequency = 10000 Hz, whole width = 0,0001 s (100 us), grid tick width = 0,0001 s (10 us)
xGridTick = screenWidthTime / 10;
xScale = (canvas.width - xOffset) / screenWidthTime;
xLabel = '10 us';
break;
}
for (x = 0; x < screenWidthTime; x += xGridTick) {
i = xOffset + xScale * x;
ctx.strokeText (xLabel, i + 25, yOffset + 25);
ctx.beginPath ();
ctx.moveTo (i, yOffset + 5);
ctx.lineTo (i, gridTop);
ctx.stroke ();
}
}
drawBackgroundAndCalculateParameters ();
var lastI; // last drawn sample (time)
var lastJ1; // signal 1
var lastJ2; // signal 2
function drawSignal (myInt16Array, startInd, endInd) {
if (startInd > endInd) return;
// find dummy sample (the one with value of -1) which will tells javascript cliento to start drawing from beginning of the screen
for (var ind = startInd; ind <= endInd; ind += 3) {
if (myInt16Array [ind] == -1) { // if signal value = -1 (dummy value)
drawSignal (myInt16Array, startInd, ind - 3); // upt to peviuos sample, there are 3 16 bit words in each sample
drawBackgroundAndCalculateParameters ();
drawSignal (myInt16Array, ind + 3, endInd); // from next sample on, there are 3 16 bit words in each sample
return;
}
}
var canvas = document.getElementById ('oscilloscope');
var ctx = canvas.getContext ('2d');
var analog = document.getElementById ('analog').checked;
var lines = document.getElementById ('lines').checked;
var markers = document.getElementById ('markers').checked;
ctx.lineWidth = 5;
for (var ind = startInd; ind < endInd; ind += 3) { // there are 3 16 bit words in each sample
// calculate sample position
screenTimeOffset += myInt16Array [ind + 2];
i = xOffset + xScale * screenTimeOffset; // time
j1 = yOffset + yScale * myInt16Array [ind]; // signal 1
j2 = myInt16Array [ind + 1] >=0 ? yOffset + yScale * myInt16Array [ind + 1] : -1; // signal 2
// lines
if (lines) {
if (restartDrawingSignal) {
restartDrawingSignal = false;
} else {
if (analog) { // analog
// signal 2
if (j2 >= 0) {
ctx.strokeStyle = '#ff8000';
ctx.beginPath ();
ctx.moveTo (lastI, lastJ2);
ctx.lineTo (i, j2);
ctx.stroke ();
}
// signal 1
ctx.strokeStyle = '#ffbf80';
ctx.beginPath ();
ctx.moveTo (lastI, lastJ1);
ctx.lineTo (i, j1);
ctx.stroke ();
} else { // digital
// signal 2
if (j2 >= 0) {
ctx.strokeStyle = '#ff8000';
ctx.beginPath ();
ctx.moveTo (lastI, lastJ2);
ctx.lineTo (i, lastJ2);
ctx.lineTo (i, j2);
ctx.stroke ();
}
// signal 1
ctx.strokeStyle = '#ffbf80';
ctx.beginPath ();
ctx.moveTo (lastI, lastJ1);
ctx.lineTo (i, lastJ1);
ctx.lineTo (i, j1);
ctx.stroke ();
}
}
}
// markers
if (markers) {
// signal 2
if (j2 >= 0) {
ctx.strokeStyle = '#ff8000';
ctx.beginPath ();
ctx.arc (i, j2, 5, 0, 2 * Math.PI, false);
ctx.stroke ();
}
// signal 1
ctx.strokeStyle = '#ffbf80';
ctx.beginPath ();
ctx.arc (i, j1, 5, 0, 2 * Math.PI, false);
ctx.stroke ();
}
lastI = i;
lastJ1 = j1;
lastJ2 = j2;
}
}
// eneable and disable controls
function enableDisableControls (workMode) {
if (workMode) {
// disable GPIO, analog/digital, trigger, frequency and start, enable stop
document.getElementById ('gpio1').disabled = true;
document.getElementById ('gpio2').disabled = true;
document.getElementById ('analog').disabled = true;
document.getElementById ('digital').disabled = true;
document.getElementById ('posTrigger').disabled = true;
document.getElementById ('posTreshold').disabled = true;
document.getElementById ('posTriggerLabel').style.color = 'gray';
document.getElementById ('negTrigger').disabled = true;
document.getElementById ('negTreshold').disabled = true;
document.getElementById ('negTriggerLabel').style.color = 'gray';
document.getElementById ('frequency').disabled = true;
document.getElementById ('frequencyLabel').style.color = 'gray';
document.getElementById ('startButton').disabled = true;
document.getElementById ('stopButton').disabled = false;
} else {
// enable GPIO, analog/digital, trigger, frequency and start, disable stop
document.getElementById ('gpio1').disabled = false;
document.getElementById ('gpio2').disabled = false;
document.getElementById ('analog').disabled = false;
document.getElementById ('digital').disabled = false;
document.getElementById ('posTrigger').disabled = false;
document.getElementById ('negTrigger').disabled = false;
document.getElementById ('frequency').disabled = false;
document.getElementById ('frequencyLabel').style.color = 'black';
document.getElementById ('startButton').disabled = false;
document.getElementById ('stopButton').disabled = true;
if (document.getElementById ('analog').checked) {
document.getElementById ('sensitivity').disabled = false;
document.getElementById ('sensitivityLabel').style.color = 'black';
document.getElementById ('position').disabled = false;
document.getElementById ('positionLabel').style.color = 'black';
document.getElementById ('posTreshold').disabled = false;
document.getElementById ('posTriggerLabel').style.color = 'black';
document.getElementById ('negTreshold').disabled = false;
document.getElementById ('negTriggerLabel').style.color = 'black';
}
}
}
</script>
</body>
</html>