ESP8266 part of the f105-motor-demo project (see f105-motor-demo_stm32)
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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<title>FFT - Current analyzer</title>
<link href="/css/app.css" rel="stylesheet">
<script src="/js/all.js"></script>
</head>
<body class="page-fft">
<div id="outer">
<nav id="menu">
<div id="brand" onclick="$('#menu').toggleClass('expanded')">Current Analyser</div>
<a href="/">Home</a><a href="/wifi">WiFi config</a><a href="/waveform">Waveform</a><a href="/fft" class="selected">FFT</a><a href="/about">About</a></nav>
<div id="content">
<h1>FFT</h1>
<div class="Box center" id="samp-ctrl">
<div>
<label for="count">Bins</label>
<label for="count" class="select-wrap">
<select name="count" id="count">
<!-- <option value="16">8-->
<!-- <option value="32">16-->
<!-- <option value="64">32-->
<!-- <option value="128">64-->
<!-- <option value="256">128-->
<option value="512">256
<option value="1024">512
<option value="2048" selected>1024
</select>
</label>
</div>
<div>
<label for="freq">Rate <span class="mq-tablet-max" style="font-weight:normal;">(Hz)</span></label>
<input id="freq" type="number" value="4096">
<span class="mq-normal-min">Hz</span>
</div>
<div>
<a id="load" class="button btn-green">Load</a>
</div>
</div>
<div class="Box medium chartbox">
<div id="chart" class="ct-chart ct-wide ct-with-area"></div>
<div class="stats invis">
<table>
<tr>
<th>Samples</th>
<td id="stat-count"></td>
</tr>
<tr>
<th>f<sub>s</sub></th>
<td id="stat-f-s"></td>
</tr>
<tr>
<th>I<sub>peak</sub></th>
<td id="stat-i-peak"></td>
</tr>
<tr>
<th>I<sub>RMS</sub></th>
<td id="stat-i-rms"></td>
</tr>
</table>
<div class="ar"><!-- auto reload -->
<input type="number" id="ar-time" step="0.5" value="1" min="0">&nbsp;s
<input type="button" id="ar-btn" class="btn-blue narrow" value="Auto">
</div>
</div>
</div>
<script>
$().ready(page_waveform.init('fft'));
</script>
</div>
</div>
</body>
</html>