I chose to use an ATMEL ATMega328 to replace the Parallax SX-28. The ATMega328 is the controller in the very popular Arduino Duemilanove. This would allow a familiar programming language (C) and a familiar IDE (Arduino Software) for many people. This is very important since I would like to allow for the board to be reprogrammed in the future. The ATMega328 did require a bit of extra circuitry for the clock (the crystal) and the reset line (the switch), but other than that, it should be able to connect in a similar way that the SX-28 did.
The schematic (click to see full size):
ATMega328 Datasheet Summary:
ATMEL. (2010, August). ATMega328p Datasheet Summary. Retrieved March 2, 2011, from ATMEL: http://www.atmel.com/dyn/resources/prod_documents/8271S.pdf
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