5v To Gnd = Smoke

Other Hardware General Electronics
1

While using the Arduino Uno R3, 5V touched GND, creating smoke. Despite this, everything worked, but a burnt smell remained, so I turned it off. Do you know how I could fix my Uno?

2

If everything is working , then not much to fix.

3

Well except the power chip next to the power input.

4

I would remove the voltage regulator; as your board still seems to be working I think that you have been a little lucky. You can replace the voltage regulator; check the schematic of the Uno to see what is exactly used.

The voltage regulator is only used when you power your board through Vin or the barrel. When powering through USB, it is not used.

So the question is what "everything worked" means; does it still work with external power or only on USB.

5

As this is an smd voltage regulator, getting it off may be quite challenging for a newbie. And may create more damage than do any good...

6

Yeah I don’t have any experience or electronic stuff..

7

This shoudn't happen.
I tried the same with my arduino uno R3 but nothing happened.

8

Did you use an external power supply (7V or more) on Vin or the barrel?

9

Depends on how the Uno R3 was powered, and what was attached to it.

If nothing was attached to it, and the Arduino was powered through the USB lead, then only the polyfuse could have smoked a bit (no harm done).
Leo..

10

Ok, well I connected to my 12v 1a adapter. See the point is that maybe some smd component switches off the connection I guess. Anyway I was just telling.

11
  • NEVER POWER A ARDUINO WITH 12V 2A . Do not consider as shouting words, just expressing. It will burn out Ams1117.
12

Which is now what?

Is the 2A the problem?

13

The 2A does not matter until the moment you make a short...
Perhaps that is why arduino company always advertises the 9V smoke alarm batteries. Those simply do not supply sufficient current to destroy your device in a split second...
The 12V is on the high side. The regulator gas to dissipate 7V. This will cause overheating, even with just a few leds.

14

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