sensori umidità del suolo

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ciao tutti,
voglio sviluppare una applicazione con arduino uno che mi legge dei sensori di umidità del suolo della decagon ec-5, che sono relativamene basso costo.
qual'è il problema:
i sensori devono essere alimentati con una tensione da da 2.5 3.5 v, però essendo sensori capacitivi, non posso alimentarli sempre!
devo alimentarli per circa 10ms (circa adesso non ricordo bene) e poi fare la lettura del canale analogico.
quindi una sorta di excitation delay !
ma come faccio settare off il pin che mi da 3.3 di tensione ?
i pin che danno come output 5v o 3.3v sono sempre aperti li posso far switchare senza bisogno di un relay?
grazie
alessandro

dacci il link dove hai comprato il sensore e relativi dati tecnici.
ciao uwe


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