Hi all,
i have to pilot 3 dc motors, each motor have an encoder with NPN output, what arduino and shield i have to buy?
Thank you in advance 
Well, what motor do you have? Please read:
Also, you posted your question in a "showcase" sub forum.
Thank you for your support, i don't know the actually motors yet, but i suppose they are 12VDC supplied (no brushless, no stepper) with 1.8A of load.
Each motor will be controlled in a close loop mode whit his own encoder
I'm sorry for my basic english...
Your English is good enough for this. The best Arduino and motor driver depends not only on the motor specifications, but on what you are using it for. So please go back and read the forum instructions I linked to, and provide the kinds of information that it asks you to provide here.
Did the number "1.8" come from a guess? I doubt it, I suspect you are looking at some motor. If so, please come forward with details of that motor, even if it is not the one that you will finally use.
I changed my reply, maybe you didn't read the last version....
I have to move the three motors as are one, i have to create a "electric shaft", do you know "electric shaft" means?
I'm considering this kind of motor, but i'm not sure yet....for this reason i didn't bring this information...it's not a secret 
i'm am very polite but my english is not, I apologise in advance 
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