Ok, thanks Krodal!
I think I'll return to my original idea, using a Bus Pirate (Bus Pirate - v3.6a - TOL-12942 - SparkFun Electronics) to link all digital sensors (it support 3.3V and 5V sensors). I have to pay attention because I was told that different devices can have the same ID, so I have to control it in the datasheet. Do you think is it correct?
Thanks for your patience.
stiv