Hi, I followed the potentiometer connection on the arduino tut website. The connection is two ends of the potentiometer to the +ve rail and ground and the middle connection to the arduino analog input pin. When fiddling around, I mindlessly adjusted the potentiometer to its lowest R value which is around 1ohm, so with this connection it's effectively shorting the Arduino 5v supply to the ground assuming the analog this pin has infinite resistance, which seems to be the case because the microcontroller seems to be operating well. But I am afraid the voltage regulator might be damage, because after that event, the 3.3 voltage rail was gone, couldn't measure any voltage out of it, but the strange thing is after I reconnected the USB and IO connections again, it was working again. I don't get it, so is my board damaged, how can I check it?
I had a look at the schematic digram of the Arduino Diecimila which is the one I have. Because I was using USB power so I think the voltage regulator should be safe. There is this F1 component which has a 500mA label near it, is this a fuse of some sort? Is it possible that this thing is blown?