Replacing Atmega328

Development Tools IDE 1.x
1

Hi to everyone,
I've just burned up my Arduino UNO because I forgot a flyback diode when it was driving a big DC motor. =(
When I power the thing it, the microcontroller start to heat up a lot, so I decided to remove it to test the voltage regulator.
Without the AtMega the board seems stable, I checked all voltages and they are fine! But there is one thing that keeps me from buying a new 328: RX (0) and TX(1) pins are high to 5v.
My question is: Arduino UNO powered up with 12v without the AtMega328, pins 2 and 3 (on the socket) are high. Is that normal? Can anyone check on his board?

Thank you,
Luca

2

That's normal, is due to the USB/Serial interface, holds the lines high when no serial transfers are occurring.

3

Thank you! I will buy a new chip and rock the Arduino again!

Luca

4

Make sure you get '328P (vs '328).

5

Dipmicro has 328 chips with the Uno bootloader on sale for $3.00 each.

6

Blank chips, and Duemilanove Bootloader.

They have had Uno Bootloader in the past, just out of stock at the moment.

7

I've already buyed this kit from eBay Italy, it's all right?
http://www.ebay.it/itm/141252859183

I'm goig to flash the boot loader with a Mega, it's quite easy, isn't?

8

olimex:
I've already buyed this kit from eBay Italy, it's all right?
http://www.ebay.it/itm/141252859183

I'm goig to flash the boot loader with a Mega, it's quite easy, isn't?

if u need any assistance for bootloader contact : mail.skullbucks@gmail.com

9

Bootload with Nick Gammon's sketch, easy & straightofrward

10

Got it!

Thank you very much,

Luca