The I2C bus is a two-wire serial bus for connecting a wide range of ICs to a computer or micro-controller:
   * wikipedia [http://en.wikipedia.org/wiki/I2C]
   * article con LinuxJournal [http://www.linuxjournal.com/article/1342]
   * I2cTcl for Tcl/Tk on LINUX [http://i2ctcl.sourceforge.net/])

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