An Arduino library for Digital Potentiometer X9C103P (or others like X9Cxxx, xxx=102,103,104,503 according to datasheet). Much like this: http://uk.farnell.com/intersil/x9c103pz/ic-digital-pot-10k-9c103-dip8/dp/1208129.
Download the library.
History
v.4, updated on May 26, 2011: modified to be compatible with Arduino 1.0; added set() to set absolute potentiometer values.
v.3, updated on Aug 4, 2011: changed data types to more appropriate uint8_t, some internal code cleaning. Fixed wrong include file name in example.