How to make OBD II to USB adaptor

Can any body know or did any body have a project of making OBD II to usb adaptor. Kindly post with pics..
I want to make one to use with OBD II software on computer.

It REALLY isn't worth the hassle, you can buy them on Ebay for peanuts.
Have you done an internet search for it yet. A quick Google image search popped up a couple of different schematics you can build your own adapter from.