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Topic: Duemilanove chip in an Uno (Read 1 time) previous topic - next topic

stonent

I found a guy on Amazon selling replacement pre-programmed "Duemilanove only" chips pretty cheap. The part number seems to be the same as the one in my Uno. Would that chip work unmodified in the Uno, or would it have to be reprogrammed in order to work?

If they'll work "out of the box" I might pick up a few so I could migrate projects off the board easily.

James C4S

Personally I would question why someone would program a chip with a few years old bootloader before clicking "BUY!!1!1!1!1".

But that's just me.

The "board type" is more of what bootloader is programmed than the actual board.

Good luck with whatever you are buying.
Capacitor Expert By Day, Enginerd by night.  ||  Personal Blog: www.baldengineer.com  || Electronics Tutorials for Beginners:  www.addohms.com

stonent

#2
Dec 27, 2012, 10:57 pm Last Edit: Dec 27, 2012, 11:04 pm by stonent Reason: 1
Ok looks like I may have found the right search query to find a similar topic:

http://arduino.cc/forum/index.php/topic,139160.0.html

Looks like the answer is, yes, but you must select Duemilanove when you use a chip programmed originally for the Duemilanove.

Maybe if I pick them up, I'll put a D on them with a marker so I remember to upload programs in Duemilanove mode.

EDIT: This was posted before I saw the response above.

stonent

They were going for a dollar each which was the cheapest I could find a 328p-pu on amazon.  I have a 30$ gift card I got for Christmas for Amazon so I was planning on buying some Arduino stuff.  Right now I just have the newsite uno r3 kit with the breadboard and wires but no components.  I was considering the green box kit that's on amazon for $22.50 but it already has the breadboard and wires which I already have.


James C4S

The old adage "if it is so cheap I can't believe it, it must be true!1!" applies in most cases.
Capacitor Expert By Day, Enginerd by night.  ||  Personal Blog: www.baldengineer.com  || Electronics Tutorials for Beginners:  www.addohms.com

retrolefty

#5
Dec 28, 2012, 12:19 am Last Edit: Dec 28, 2012, 12:21 am by retrolefty Reason: 1
There are bargains to be found from time to time, in spite of James pessimism, but this one appears to not be one as if it's the same listing I found on Amazon for a $1 328p, has a rather interesting shipping charge:

Quote

http://www.amazon.com/ATMEGA328P-PU-with-Arduino-Bootloader-Duemilanove/dp/B00761CCH0/ref=sr_1_31?ie=UTF8&qid=1356650135&sr=8-31&keywords=atmel

$1.00
+ $4.99shipping


Lefty

stonent

Yeah I think I found a better deal.

http://www.amazon.com/gp/offer-listing/B007SH0D0A/ref=dp_olp_new?ie=UTF8&condition=new

2.95 + 1.95 shipping.

Nick Gammon

If it's a genuine chip you can put the Uno bootloader on it easily enough.
http://www.gammon.com.au/electronics

eried


If it's a genuine chip you can put the Uno bootloader on it easily enough.


There are fake atmegas?
My website: http://ried.cl

Nick Gammon

Quote

...  pre-programmed "Duemilanove only" chips  ...


What sort of chip can only be a Duemilanove? Not a genuine one.
http://www.gammon.com.au/electronics

retrolefty



If it's a genuine chip you can put the Uno bootloader on it easily enough.


There are fake atmegas?


Yea, they are called PICs.  ;)

stonent


Quote

...  pre-programmed "Duemilanove only" chips  ...


What sort of chip can only be a Duemilanove? Not a genuine one.


I think they said that because they put the Duemilanove boot loader on it. I don't believe it is fake.

Tom Carpenter



There are fake atmegas?

Yup, as Sparkfun found out in 2010 :). It makes for some interesting reading.

http://www.sparkfun.com/news/350
http://www.sparkfun.com/news/364
http://www.sparkfun.com/news/384
http://www.sparkfun.com/news/395
~Tom~

James C4S


There are fake atmegas?

All components are victims of counterfieting and shipping known bad parts.  Even capacitors...

Buying from well known supply chains significantly reduces this chance from happening
Capacitor Expert By Day, Enginerd by night.  ||  Personal Blog: www.baldengineer.com  || Electronics Tutorials for Beginners:  www.addohms.com

eried

I see, but looking at the evidence it seems they can't yet clone a fully working atmega328 for example cheaper than the original one.
My website: http://ried.cl

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