The PC would need some kind of I/O card or device in order to do any actual controlling. They are available but for the price of an arduino i don't think it would be worth it. Best option would be to use an arduino that talks with a PC over serial. You can write a GUI or APP that you can use to control the arduino on the PC through serial. I do a variation of this but using ethernet and a web server.
thanks for the replies the reason i asked is i have a cnc wood mill i built that yses an old desktop computer to control it and was just thinking that maybe someone had done something with a desktop to modify it for aquarium use James
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