Hey ppl Im a newbie. I want to know the output voltage of the Analog and digital output pins. I cudn't find it in this link http://www.arduino.cc/en/Main/arduinoBoardUno. Is it 5V? Also it says Uno operates at 5V but recommended is 7-12V. So what operation voltage should I use? Also whats the limit for input voltage for analogue/digital i/o pins?