ESP8266 part of the f105-motor-demo project (see f105-motor-demo_stm32)
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f105-motor-demo_esp/html_src/page_spectrogram.php

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<?php $page = 'spectrogram'; include "_start.php"; ?>
<h1>Spectrogram</h1>
<div class="Box center" id="samp-ctrl">
<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>
<label for="interval">Interval <span class="mq-tablet-max" style="font-weight:normal;">(ms)</span></label>
<input id="interval" type="number" value="100" step=100 min=0>
<span class="mq-normal-min">ms</span>
</div>
<div>
<a id="go-btn" class="button btn-green">Start</a>
</div>
</div>
<div class="Box center">
<canvas id="sg" width=860 height=512></canvas>
</div>
<script>
$().ready(page_spectrogram.init());
</script>
<?php include "_end.php"; ?>