My arduino diecemilia is overheating when plugged into any computers usb port. The main chip, a 168, gets really hot in a matter of seconds. Is the chip bad, or is there something wrong with the board? All tracings appear to be intact, and the board is clean. No other chips on the board heat up, and it still functions perfectly. Any ideas?
Is the chip in the socket the right way round?
Yes, I have confirmed the proper placement of the chip. The doard seems to be in every way normal.
Have you put a voltage meter on the board to see how much power the board is getting. I would hate to think there is something wrong with your PC that is causing well more then 5V to be supplied through USB.
It's a moot point now. My arduino was accidently connected to mains coltage during the course of my project, and is now dead. Time for a new one! (And an isolation transformer. Never mix grounds)
Never mix grounds
I think you mean never mix the wrong grounds.
Wiring together grounds is sometimes a absolutely necessary thing to do when externally powered devices are being wired to an Arduino, but this is usually DC grounds from external voltage sources.
Lefty
I recently purchased an Arduino Duemilanove w/ the ATMEGA328. Today I noticed that my 328 overheats when I hook it up to either the USB or the 9V power adapter. :o
I`m not running anything crazy, just the blinking LED program.
Any thoughts?
Forgot the current limiting resistors?
Nope. Nothing was attached to the board except the USB cable.
If it has 5V on it, nothing else connected to it and it overheats then there is something wrong with it.
There might be nothing connected now but abuse of the board in the past can damage it and cause this to happen.
Well, naturally if it's getting hot, that means there's a problem and likely a short somewhere in the circuit or board... but... if you're into having fun, you could always throw it in liquid cooled nonconductive fluid 