I when out and bought one of theses hardly knowing anything about it. When i got it in the mail i was so excited. I already had a programmer to program it. I wired it up and started basic programming. I was very happy to know that there were 12 Io pins a 6 pwm pins. Today i just figured out that there were 19 Io pins. I'm so happy with this product. I have been coding for about 1 year. I'm about fluent with the code. I also would rate this product 11/10 because of how easy it is to program. I've bough many of these and not one failed me !!!
I love arduino SOOO much!!!
i recommend this product to everyone

Any chance of restocking those b4 Free Day?

Regarding comment of Member #67029 about debugWire on Arduino boards: It's not the lockbits but the capacitor (usually 100 nF) on the reset line. I followed the instructions about removing it at http://husks.wordpress.com/2010/02/21/modify-an-arduino-for-debugwire/ and that worked.

Being that this has the Duemilanove bootloader, can I program it in an Uno board ?

Is it possible to burn a different bootloader onto this? I got one of these chips awhile ago and just found the Metaboard project. It uses a USBasp bootloader so you don't need the FTDI chip.
Can I put the USBasp on and replace the current one?

Pardon me for my Nubee'ness, just learning the arduino, but i want to make sure, can i put this chip on a UNO board, program it the way i want, then remove it to use in a custom circuit or breadboard? (of course with the required crystal, loading caps, etc.)

Hi,
Sorry for my ignorance but I am very new at this.
How do I burn my arduino code?, I need an arduino board?
or i need to buy this also?
http://www.sparkfun.com/products/8165
or this?
http://www.sparkfun.com/products/718
I need mount this atmega in a pcb, not in a arduino board.
Thanks!

I was working with a system with mixed voltages (5V and 24V), and [yes, you guessed it] seem to have messed up/fried some of my digital outputs (8-13) do to an inadvertent connection.
If I swap out the current AT328 on the Duemilenove I have with this, will all be fine, or is there a buffer chip that has been destroyed as well?

hey guys, I'm new to standalone microcontrollers. I was wondering if it was necessary to have the arduino bootloader on board if you were going to flash it using the method mentioned in the following link. http://arduino.cc/en/Tutorial/ArduinoISP
-Thanks

When can we expect these back in stock?

Is this the regular 328, or the 328P?

Can we get these in other packaging formats? :) thanks!

Apologies for the really newb question, but how much current can a digital out pin source on this thing at 5 VDC? I'm looking at using a pin to enable a wireless transmitter that'll suck down 20 mA and I'd like to avoid using a transistor if I can. (Mainly because I'm too impatient to order one and wait for it to arrive. :-P)
Trouble is ATMega's datasheet didn't list how much current this thing can source/sink on its various pins.

so i can drop this in the uno and just go right????

Do these work in the UNO?

Does someone know where I can find an EAGLE part for with with appropriate pin labels and footprint?

I bought some of these for a non-arduino project, because naked 328s were out of stock (here and digikey and mouser and everywhere else). Turns out the arduino configuration sets the fuses to use an external oscillator. I was programming them in-circuit with an adafruit usbtiny, and my circuit had no external oscillator, so they were unprogrammable.
A friend rescued my chips with his fancy-pants AVR-brand dev board (with oscillator). If you don't have one, you can use this circuit:
http://www.seanet.com/~karllunt/fixavr.html
In any case, this is a non-issue for people who (a) are using these with arduino, (b) are using them with a board that has an external oscillator, or (c) just order the factory-default chips, now that they're in stock again.

Warning!! For anyone using this as non-arduino, I've had a problem where after enabling debugWIRE, I can no longer communicate to the chip, either to debug or disable debugWIRE. I believe it has to do with the arduino bootloader having lockbits enabled which causes problems with debugWIRE. I don't have another one to try disabling lockbits before enabling debugwire, but this is my best guess from the documentation.

You can upload Arduino code using the Arduino IDE and an ISP:<br /> <br /> http://arduino.cc/en/Hacking/Programmer<br /> <br /> you don�t need the bootloader, nor a serial connection, but you do need an ISP (I prefer USBtinyISP). Helpful, I think, if you don�t have a serial connection.

I have completed the project of getting one of these as a stand-alone project in a breadboard. I have a video and instructions on how to do so at:
sites.google.com/site/aaroncrum
I purchased the ATMega328, the 16Mhz resonator, and the 28 pin DIP holder from this site.

[noobquestion]Ok, I'm not really familiar with this stuff, but basically you can just slide this thing into the Arduino Uno (or any compatible one) to program it, and then use it in a circuit just like it were a full sized Arduino board, only with the stuff listed above (5V power supply, a serial connection and a 16MHz crystal or resonator)?[/noobquestion]

hi,
I have one of these chips running fine at 16Mhz, but I need to change to 8Mhz so I can run at 3.3V. I know I need to replace the external crystal to 8Mhz, but what else am I going to have to do? with some searching on the forums, I really have not found a clear cut answer yet.
Do I need to create a new bootloader or something?
Bootloaders frighten me, although I have ordered a programmer to defend myself with.
Many thanks in advance for any help.
Phil in Austin, texas

Is this a flash quadrupling drop in replacement for the Atmega8 in my old Arduino NG board, or will it only replace the 168?

This is very easy to use on a breadboard or in your own prototypes. I have written a simple tutorial on how to do so here: http://wp.me/pQmjR-rm

A tip when using this:
Use a good pcb to mount it on, since the crystal is very sensitive.
It took me a long time to under stand that it was my prototype pcb that was leaking current to the resonator so it did not oscillate.

well, after reading the comments, idk if i want to buy one. the bootloaders seem screwed.

Mine didn't seem to come with much of anything flashed onto it. It didn't blink the onboard LED of my Arduino Duemilanove like the original 328 did. I couldn't upload a sketch to it, either. I spent the extra dollar to avoid building the parallel ICSP cable for now... but ended up doing it anyways. After a manual bootloader flash, the LED started blinking like it should and would accept the sketch upload. The basic test seemed to run ok.
If anyone else decides to do the parallel cable under Debian/Lenny, there are a few quirks that are easy enough to work around.
Run: mknod /dev/parport0 c 99 0 ; chmod 666 /dev/parport0
Don't make the cable too long. Maybe use 100 ohm resistors instead of the higher value ones in the schematic.

think of the fact that you will need two 20nF capc if you chose to use the 16MHz crystal instead of the http://www.sparkfun.com/commerce/product_info.php?products_id=9420

Could we get the eagle part for this?

Can you buy just the ATmega 328 and burn the bootloader yourself? I have the Arduino program and it has an option to "burn bootloader". I'm very new to this so please forgive this if it's a stupid question.
I'm trying to make a printed circuit board that has an arduino (and much other stuff) all on it. I want the low cost of putting the chip on without using a Pro Mini, but this chip is still out of stock.

I see that this can you can drop this into Duemilanove, but can this be dropped into the Diecimila board without any modifications?

I used the ITP tutorial for wiring up a breadboard Arduino (http://itp.nyu.edu/physcomp/Tutorials/ArduinoBreadboard) and I get behavior where it blinks once, but then pauses and blinks more and more rapidly, and then stops. I am going to wire up the FT232 breakout board next, but was a bit puzzled by the behavior at this checkpoint - is this the preloaded program or is the preloader program the plain old blink, and something getting wacked with the timing?

It would be great if you offered a variant of this item with an Arduino Bootloader compiled for 20MHz.

Any chance of getting an SMD version of this chip?
I want to make my own version of the arduino pro mini for an project so i can integrate everthing i need on the same board.

so...crystal vs ceramic resonators: any preference? Haven't done this stuff in awhile, can't remember what's used for what.

When will more of these be in stock?

Can the internal resonator be used instead of an external clock with the Arduino bootloader?

Can this be swapped for a 168 on an arduino duemilanove without any modifications?

ohh finally, i was waiting for this guy :)

wow, 10 year old me was really annoying. Forget this comment ever existed.