On a microcontroller, though, you’ll have to roll your own CPU load meter with a few parts, some code, and a voltmeter. We like [Dave Marples]’s simple approach to quantifying something as ...

Install the CPU onto the motherboard carefully to prevent bending pins and irreparable damage. Look for a triangle indicator ...

But there was a window in the front panel where it seemed like a numerical display was intended to go, so they decided to wire up their own CPU indicator by sensing the state of the Turbo LED ...