CPU load counter via serial connection
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This thing displays how much the CPU is doing. The value of the CPU usage is read from the PC's register with a Visual Basic script (.exe file). 
This value is then transmitted via the serial port to an ATmega8 microcontroller. Other nerds will know that this is done via an MAX232 converter. 
After that I got lazy and decided to use a 7447 (7-segment display driver) to display the result.

It refreshes every second, but that's enough really. It's like the thing you can see when you press CTRL+ALT+DEL. 
By the way, did you know pressing backspace takes 13% of my CPU... 

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By: Simon van Veen
http://home.deds.nl/~cmon/
http://cmon.nl.tt
Date: September 11th, 2008

This is a project I did in an afternoon so it isn't  well documented. 
Also, it is not finished and perhaps never will be.
Still, you can use this as a basis for your own project so that's why I give out the code.

Before using anything I made, read the disclaimer on the website or ask me for it.

Special thanks to the guys who did the code to read the CPU % value. I couldn't do that myself.