I've connected the gnd to 7.2v and the pin vin to the minus of the battery... as result the chip near the DC power connector blow up! Ok... now I have two questions 1-Which is the name of the chip? There's written something like 113nf 2-Is that chip the only thing I broke? I'm so afraid T_T

I'm using an arduino UNO r3 :drooling_face:

Post a picture. I find this works well: copy from the product page, paste into powerpoint, draw an arrow, save as .jpg. Then clickk Additional Options, Browse to your file, and Attach it.

CrossRoads: Post a picture. Thanks for your reply, I hope to find a solution in order to not buy another arduino :smiley: There are 4 arrows in the left-bottom corner [arduino1.jpg]

You likely damaged other stuff on the board sensitive to having reverse polarity applied. It will take some time and expense to replace the obviously bad component(s) only to see that the board still doesn't work. That is too bad because if you had applied the reverse polarity to the external power…

That part is the 5V regulator. NCP1117ST50T3G | Digi-Key Electronics Order today, ships today. NCP1117ST50T3G – Linear Voltage Regulator IC Positive Fixed 1 Output 1A SOT-223 from onsemi. Pricing and Availability on millions of electronic components from Digi-Key Electronics. …

Ok... i removed the burnt chip and now (via usb and via 5v pin) it works! In a few days I will buy some reg sot223 5v I will notice you about what will happen :stuck_out_tongue:

Make sure the part you purchase has the same pinout as what's on the board.

The only reg I found here, in Italy is a sot-223 5v BUT the pin out is input-gnd-output :~ :~ :~

Keep looking then. Or, use a leaded part, and bend the pins to end up where needed. Or get a 5V wallwart, and jumper over the regulator pads (and reverse polarity diode). Or get a USB wallwart, and power the board thru the USB port.

I reversed gnd and vin...

Development Tools IDE 1.x

system May 17, 2014, 1:51pm 2

I'm using an arduino UNO r3

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I reversed gnd and vin...

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