Pour convertir le 5v des sorties de la carte arduino en 3.3v, utilisez un convertisseur de type CD4050 BE Hex Buffer/Converter non invertering
power it (pin 1, Vdd) at 3.3v put 5v on the input of one of the gates, and you get 3.3v on the output of that particular buffer. For example, with 3.3 v on pin 1 (Vdd) and pin 8 connected to ground, a 5v logic level on input pin 14 (gate 6) results in 3.3v on output pin 15.
AndroLogiciels 
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