How hard is it to make a computer controlled switch?

Hey guys, I was planning an instructable but I would need to create a program to turn switches powersource switches on and off. The switches would be for regular power sockets so I wouldn't have to modify the stuff I plug in. I have no idea how to do it, is this an easy problem? Where would I get the parts needed? Thanks for any advice!

Padlock8 years ago
I would recommend a parallel port controller. You use software to pull the state of the parallel port pins up or down; you can connect a transistor-relay set-up to it, then use this software below that I made.
Controller.exe is the main program. You have to put the rest of the files attached in C:\Windows\System32.
You can get a more detailed schematic from here
pro2xy8 years ago
hey hav u got a soln for that?