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I have purchased an ATMega328 from SparkFun with the Arduino bootloader pre-programmed. My intention is to replace the ATMega168 I currently have in my Duemilanove. Is this as simple as swapping the chips, or will I need to take any additional steps? As I recall, I am currently at Arduino 13 but am planning to upgrade to 17 (current version) concurrent with the part swap.

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    \$\begingroup\$ The upgrade went without a hitch! I realized I had Arduino 12 installed, however, so I had to change things up a bit: -Upgraded Arduino software to version 17 (most recent). -Set up software to work with the current chip (the 168). Verified that communications were working.* -Upgraded the Arduino hardware to an ATMega328p with the Arduino bootloader previously flashed (from Sparkfun). -Verified the software and hardware still played together nicely. *The communication worked, but my software ran out of RAM. I only wanted to verify communication, so I wasn't concerned by this. \$\endgroup\$ – Lou Nov 6 '09 at 14:55
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Yes, you may simply switch the chips. Version 13 implemented support for the 328, so an IDE upgrade is not essential.

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Make sure you change the "Tools/Board" setting in the Arduino IDE to "Arduino Duemilanove or Nano w/ Atmega328"

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Yes, you can just swap it in. I've also upgraded a Diecimila without any problems. If you have an AVR programmer (such as the one from Adafruit) you can also upgrade it with a fresh unprogrammed chip.

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