Hello and welcome,
the expansion connectors XBUS1 and XBUS2 contains, both a I2C bus (SDA, SCL).
I2C Tutorials and Specs: http://www.robot-electronics.co.uk/i2c-tutorial
http://www.ti.com/lit/an/slva704/slva704.pdf
http://www.i2c-bus.org/fileadmin/ftp...ation_1995.pdf
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