Arduino Uno problem after supply with AC power adapter ???

Other Hardware General Electronics
1

hello Arduino community;

i had powered my arduino uno board with an external power supply an a problem is happened, which it just stuck holding ON LED and Pin 13 LED ON all the time, and it became not detectable with any PC with USB connection no PORT open and doesn't show up in the device manager.
and when i check the power adapter i find that it's AC power supply with ~16v approximately :frowning:
and when i check the ATMEGA328P chip with my Minipro T866 programmer i think it's damaged; in addition to i don't know if i connected it correctly, just plug it in the Upper pins of the programmer :confused:
so i need to know if the arduino board and/or the ATMEGA chip are both damaged or not, or is there a chance to recover something from these components, and how i can do whatever possible.

THANKS

2

Where/how did you plug it in? It sounds like you bypassed the barrel jack and connected the pins? If so, specifically, which pins?

3

hello sir thanks for replying

i connected the power adapter in the adruino external power socket not in the pins

4

Was this an unregulated supply? If so the voltage peaks could be a lot higher than 16V.

5

yes markT i think so

6

Try powering the uno from the usb cable rather than the 16v.
Does it work that way?
You could have damage the onboard regulator and/or the processor.
If the processor is not damaged, it should work from the usb power.

7

Hi,
I think the important bit of this is;

and when i check the power adapter i find that it's AC power supply with ~16v approximately

The AC bit, the whole board has been connected back to front as well as higher than 16V peak volts.
Do all UNO clones have polarity protection diodes?

Tom..... :slight_smile:

8

yes sir i tried to power it with the USB but it just hanging with ON led and Pin13 LED on and not detected by the computer device manager i think the ATMEGA328 is damaged

9

Whether the device manager detects the board has nothing to do with the ATmega328 - it will in fact, be detected every bit as well with the ATmega328 removed.

This also applies if the board is not a UNO but a pseudo-UNO clone with a different USB to TTL chip.

Measure the voltage on 5 V and ground with it connected to USB.

10

suffice it to say, you should read the label on any adaptor BEFORE you connect it.
Paul's comment is a reference to the fact that pc communications are handled by the surface mount chip (ATmega16). It's hard to say if anything got past the 5V regulator or even if it was damaged. Can you make a 9V battery adaptor with the right connector on it ?