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/])
   * See the presentation from http://www.eurotcl.eu/eurotcl-2014/program.html#Ender%|%Uli Ender%|% and [Uli Ender bitbang I2C with Arduino]
   * You can find an example to write to a LCD with an I2C interface using Arduino here: [Firmata]
   * One more interesting article [https://elinux.org/images/d/d8/Stoppa.pdf] "I2C Hacking Demystified"
   * [I2C bitbang with lpttcl]


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