Hi to all, i've a problem with my arduino diecimila. I was trying to connect an LCD to Arduino but I made ??the serious mistake of connecting the pin that adjusts the contrast directly to gnd without resistance, as soon as I connected it I noticed that the LED light power has weakened, almost off. I've unplugged the usb power and removed all the pins. Since he did not feel it stinks, I reconnected the USB and tried to load a rpm code (seemingly fully functional in uploading) and I noticed that although he had not attacked the sensor, the L LED flashed at random and sent to serial monitor random numbers of rpm, which was not happening before (before the L light remained on or off and rpm result was always 0). But attacking the photocell and testing it, the result is 0 when it not closed as it has always done, and the cell when attached to motor seems to count the laps without errors. Can you tell me how can I figure out what I burned or damaged? maybe if there is a program that tests the functionality and hardware of arduino, to see if I need begin to order a new one.
Sorry for my bad english.
And the video of the problem: http://tinypic.com/player.php?v=20z2t81&s=5