Hi,

What about I2C?

* * *

Nuts & Volts Column #109 May 2004 by Jon Williams:

Easy IO – Easy LCD Terminal
(I2C to LCD + Pushbuttons).

http://www.parallax.com/dl/docs/cols.../col/nv109.pdf
http://www.parallax.com/dl/docs/cols...code/nv109.zip

Microchip MCP23016 16-Bit I2C™ I/O Expander
http://ww1.microchip.com/downloads/e...Doc/20090b.pdf

Luciano