I don't think it can be much more compact than the TTL-232R cable from
FTDI. You have to look closely to notice that the USB-connector is a bit
longer than a usual connector, in the other end there are 6 pins ready
to connect. There you also have +5V and ground.
I used this cable recently with Parallax's RFID-module. The cable and
the module was all I needed, the only thing to solder was to connect
/Enable to ground.
Real simple, and with the help of XP's serial keyboard function I now
can log in with a RFID-tag.

The cable is cheap too (around 15 euro), I think I will use it more in
the future.

/Patrik

Dave King skrev:
> Just curious if anyone has used one of the pics with usb to create
> a usb to serial bridge?
>
> I know the usb-232 are fairly cheap but I really need a much more
> compact design.  I googled and found lots of these but all seemed
> to use a FT usb converter chip. I was looking at the 18F's with 
> USB 2 and pondering if it could be done with just a pic.
>
> so has anyone done it seen it? Has schematics to share? ;-]
>
> Dave.
>   

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