ComputerVoltageSources

Unfortunately I2C protocol is a bit more complex than
SPI, so you can't use something as simple as the
74HC595 shift register for it. 

However, Maxim makes the MAX6956 which can be used for
input/output and has programmable constant-current
capability for LED driving and available in a DIP:
http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3503
available from Digi-Key for ~$8
http://www.digikey.com/scripts/DkSearch/dksus.dll?Detail?Ref=81478&Row=445765&Site=US

I2C is also great for memory expansion - the Atmel
AT24CXXX parts are all extremely inexpensive I2C
EEPROM in 8-pin DIP. 64kx8 for about $2 from Digi-Key:
http://www.digikey.com/scripts/DkSearch/dksus.dll?Detail?Ref=84768&Row=289729&Site=US

Eric

--- Grant Richter <grichter@...> wrote:

> 
> That still leaves the I2C port uncommited. Does
> anyone have a neat I2C port expanded they 
> would like to mention?
> 

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