From the MAKE Flickr photo pool

Here’s a good project for those interested in getting started with microcontroller circuit builds – Izuna posted details on building a PSX controller –> USB converter using an ATmega8 chip –

Sure, you can buy an extensor and cut the cable, but you can also buy a PSX to USB adapter for cheap if you want. This is not the point, the point here is make something yourself (and if you have the rights tools beforehand, this is cheaper than buying the adapter [At least I think it is in Brazil]).
The circuit is very simple, the Atmega8 do all the work, there is just some resistors and zeners to meet the standards for USB protocol, the oscillator crystal and some filtering caps


USBJoy on Flickr

PS2 controller -> MIDI converter kit

Microcontroller kit