Go Down

Topic: Uno not detected (Read 623 times) previous topic - next topic

Gigabyte

Hello

The other day I was testing some circuits around with Uno.
Basically, I was using an external power source of 12V for my circuit and the USB connection for the arduino. Somehow I think I short-circuited, probably by connecting the +12V to the arduino ground. The computer even turned off.

Thing is, now the board isn't detected when I connect it to the PC. It still works as I intended it to work, functioning as a timer, but I cannot access it from the computer. Already tried another USB cable and on another computer, the board simply isn't detected.

I think I fried it.

Any thoughts?

James C4S

Do the loop back test (at the stop or this forum).

You probably damaged the ATmega8u2 chip.  The one next to the USB port.  Does it get warm?
Capacitor Expert By Day, Enginerd by night.  ||  Personal Blog: www.baldengineer.com  || Electronics Tutorials for Beginners:  www.addohms.com

Gigabyte

I already tried the loop back, but there is no connection at all, so no use

And no, it does not get warm

James C4S


I already tried the loop back, but there is no connection at all, so no use

It confirms you lost the ATmega8u2.  You can probably use FTDI (or similar USB to Serial) cable to program the ATmega328.  Or you can try to replace the 8u2, but that's a pretty delicate operation.
Capacitor Expert By Day, Enginerd by night.  ||  Personal Blog: www.baldengineer.com  || Electronics Tutorials for Beginners:  www.addohms.com

Gigabyte

Ok, ty.
I really don't think I can replace the 8u2

It really looks hard to do, and I would NOT be able to solder it with my tools, so...

Probably going for a new board...

Go Up