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I want your advice regarding powering up Arduino Uno using AC/DC Adapter to the barrel jack.

The first adapter I use couldn't work and the shop which I bought it from said the adapter was short circuited.

Out of goodwill, she replace it for free and I tested it out again. The first few tries it worked perfectly fine but stopped working (suspected short-circuited again).

The adapter output is 9V - 2A.

The circuit consists of 2 ultrasonic sensor and 1 buzzer.

I am quite sure the Arduino circuit does not draw more than 2A of current.

Any idea what's the issue? Thanks!

EDIT - enter image description here

I've uploaded a photo of the schematic done using Tinkercad. I am using a different breadboard thus the configuration as shown.

Gil Sven
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Zac
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1 Answers1

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The pictorial shows power via the USB supply - not via the barrel connector. There’s no regulation. 9V to the barrel connector is pretty common. Could just be a pictorial blunder.

Wrecking two adapters suggests a yet to be determined fault resulting in an extraordinary overcurrent situation. Even a 0.5A inline fuse should be enough for your application and will protect the next adapter. You might also try a 9V battery (perhaps depleted some) with connection via barrel tip so you don’t go wrecking another adapter and you can still check functionality and affirming UNO’s operation. Also drop all loads and add piecemeal.

DLSmith
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