[/COLOR]Hello! I have diagram here that shows function to freeze the mouse and keyboard.

Anyone here know how to add a function to power on the CPU using a relay.

 

What is the purpose of freezing the mouse and keyboard?

 

Anyone here know how to add a function to power on the CPU using a relay.

Are you actually refering CPU as a "PC"?

That should be easy, Just connect the N.O. contacts of the relay in parallel with the "power on" button on the front panel for 1 seconds. But how do you turn on the relay?

Allen

 

Why? Just lock your computer with a password!

 

as asked already, what is the purpose of this?
it can't be security (unless this security inventor is a complete idiot) because killing power to usb hub accomplishes nothing - one can simply get rid of hub and connect keyboard and mouse directy.

 

as asked already, what is the purpose of this?
it can't be security (unless this security inventor is a complete idiot) because killing power to usb hub accomplishes nothing - one can simply get rid of hub and connect keyboard and mouse directy.

I've seen a key lock system or vending system for public kiosks where the PC and monitor is in an enclosure and keyboard/mouse is accessible. They wanted the live video and other on-screen data to be visible so "locking" the desktop was not possible.

What I an trying to say is, it is not necessarily an idiotic idea.

 

You can use atmega 328 microcontroller and 2 relay module for disconnecting any pins on ps/2 or usb header think of arduino project or go to this link.

http://www.ebay.in/itm/MULTIPURPOSE..._DefaultDomain_203&hash=item3f2612deea&_uhb=1