My special thanks on this project go to an innumerable number of internet forums I had to research, and my 3D printer, that tolerated an unbelievable number of test prints.

Also, to Alex of RasPi.TV, for an excellent breakdown of the i2c pattern for the MCP23017 chips.

This guide was first published on Nov 29, 2015. It was last updated on Nov 29, 2015.

This page (Special Thanks) was last updated on Nov 11, 2015.

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