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 Hey guys,

which powerful ( most important is the pins number) microcontroller would you advise me for an Arduino uno?
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Arduino UNO is based on an ATmega328. 28 pins, of which 18 are usable.

If you need more pins, get an Arduino Mega.
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thx ..still got one more question. Does the Arduino uno support the ATxmega* microcontroller ?

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"28 pins, of which 18 are usable."
20 are usable - 2 are typically tied up with serial interfacing, but if you are not doing that they are available for other uses.

ATxmega* - check at www.avr-developers.com

If you need some more IO (32) or more RAM (16K, 128K of flash memory), check out '1284 based designs as well.
For example, Reply # 287 on page 20 here
http://arduino.cc/forum/index.php/topic,80483.285.html
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"28 pins, of which 18 are usable."
There is pin 0 to pin 18 - that makes 19 input / output pins in all.

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which powerful ( most important is the pins number) microcontroller would you advise me for an Arduino uno?
This question makes no sense because there is not a choice, if you choose the Uno you get a Uno.
If you actually just mean Arduino and not Arduino Uno, then as has been said it is a Arduino mega.
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