Here’s a great and simple project using a Papilio One and a pcDuino together for the purpose of making a USB to 3.3V TTL RS232 adapter. This is from Mike Field’s site Hamsterworks where he’s got a full project description and the code to go along with it! Mike says,
[jbox color="blue" vgradient="#fdfeff|#bae3ff"]I’ve got a pcDuino and sometimes it is nice to have access to the serial console. Although you wouldn’t want to dedicate a board to it it is perfect for occasional use. As a bonus, due to the flexibility of the FPGA’s I/O pins you can use it for multiple different I/O standards and voltages – If you change to IOSTANDARDs and maybe the Vco jumper you have also got yourself 2.5V or 1.2V CMOS to USB adapter![/jbox]

Cool project, Mike.  It just so happens that we are now selling the pcDuino to compliment our own Gadget Factory product line-up, you can check it out in all its glory here.

(via Hamsterworks)