(This post is based partly on suggestions by @hiduino , @Graynomad , and @CrossRoads seen here: 3.3V inputs & outputs - #13 by hiduino - Arduino Due - Arduino Forum 3.3V inputs & outputs - #6 by graynomad - Arduino Due - Arduino Forum Why not a voltage selector on the Arduino board? - #19 by CrossRo…

Solution for the 5V vs 3.3V problem

CrossRoads December 10, 2012, 7:07am 5

Think I've got ok start for it:

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