I have built a Raspberry Pi controller for my UDS following Bryan Mayland's Step by Step.
The Raspberry Pi is a credit-card sized computer- a Broadcom BCM2835 SoC, which includes an ARM1176JZF-S 700 MHz processor, VideoCore IV GPU, and 256 Megabytes of RAM
The complete project is actually very easy, the soldering is the hardest part.
The cost is about 110 dollars for everything
A case is still in the works but the design is being 3d printed and the files will be available to order if they fit correctly.
The complete Pi-Hetermeter. You can see a spot on the board for a wireless receiver(below the "NO" on the display), when used you can add wireless probes
This pic shows the Hetermeter(top) and the Raspberry PI(bottom)
Raspberry Pi Heatermeter
A list with links to all the needed components
A Step by Step
Anybody can build one without experience. The WRT54G/heatermeter was my my first project and I have learned alot doing it myself. Bryan Mayland over at www.tvwbb.com
will answer every question and is very helpful. He also continuosly upgrades the software putting in around 30 hours a week on it.
Here is a link to my still in use linkmeter and it also has a link to my older thread