doc: Update Arduino tutorial
doc: Update Arduino tutorial

bergie/microflo,microflo/microflo,microflo/microflo,microflo/microflo,bergie/microflo,uwekamper/microflo-spiexperiment,rraallvv/microflo,rraallvv/microflo,uwekamper/microflo-spiexperiment,rraallvv/microflo,microflo/microflo,rraallvv/microflo,bergie/microflo,uwekamper/microflo-spiexperiment,microflo/microflo,uwekamper/microflo-spiexperiment,microflo/microflo,bergie/microflo