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📝 Raspberry Pi temperature monitor

(Note last modified 2025-09-04 - View change history)

vcgencmd is a tool that can be used to retrieve information from the VideoCore GPU on the Raspberry Pi. It is typically found at /opt/vc/bin/vcgencmd in Raspberry Pi OS. The full documentation is available here on the Raspberry Pi website.

Among other things, this command can be used to retrieve the current temperature of the SoC on the Pi:

$ /opt/vc/bin/vcgencmd measure_temp
temp=50.0'C

If you have a web server with PHP running on the Raspberry Pi you can expose this value from a page that will automatically refresh to always show the current temperature of your Pi.

<!DOCTYPE html>
<meta charset="UTF-8">
<meta http-equiv="refresh" content="1">
<title>Raspberry Pi Temperature Monitor</title>
<style>
html, body {
    height: 100%;
    background-color: #111111;
    display: flex;
    justify-content: center;
    align-items: center; }
.number {
    color: #dadada;
    font-family: sans-serif;
    font-size: clamp(80px, 20vw, 260px); }
</style>
<span class="number">
	<?php echo substr(shell_exec("/opt/vc/bin/vcgencmd measure_temp"), 5); ?>
</span>