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Topic: ATmega4 vs ATmega8 vs ATmega328. Project use? (question) (Read 6 times) previous topic - next topic

Caliber Mengsk

So, as I've stated in a different post, I'm working with making an arduino system that's practically an led control kit. I also found online that the ATmega4 and ATmega8 performs the same as a 328 as far as speed, power consumption, etc. I was just wondering is there any reason an ATmega4/8 can't run arduino? The main reason I ask is, because I'm not too worried about 8kb of space on the ATmega8 being to small (most programs that I'd be writing to it would be at most 100 lines) compared to the 328' 32kb (... I now get the naming convention of the 328.... XD), I am kind of worried about the 4kb of the Atmega4, with the bootloader on it. I don't think the application of turning on and off leds is very ram intensive, so the extra 1kb ram from the 8 isn't really needed (script doesn't use many variables either).

So... O-o I guess what I'm asking, is the ATmega4/8 compatible with arduino?

The main reason I ask is because an ATmega4 is only $1.77, ATmega8 is only $2.30 where as the 328 is $3.42 (all surface mount, all not pre-programmed, from mouser). Sure, in the short term, it isn't that much of a difference in cost, but the cheaper I can make my own chips, the more neat little toys I can make :P. I think my total build cost per unit would be less then $5 per unit if I can just use the ATmega8, and possibly even less then $4 with the ATmega4.

Are there any other cheaper alternative chips like these that do work with the arduino bootloader?

(>_< sorry for the two different posts so quickly together, but they aren't really all that related)

johnwasser

The ATtiny25 can be bought for $1.89 from Digikey in single quantities and there is an Arduino core for it.

http://code.google.com/p/arduino-tiny/
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Caliber Mengsk

#2
Oct 10, 2011, 11:06 pm Last Edit: Oct 10, 2011, 11:20 pm by Caliber Mengsk Reason: 1
Thanks for pointing those out. I'd still like all the outputs though. The closest is the ATtiny2313, with 18 i/o pins, which would actually be fine, but if I can use the ATmega4, I'd still have all 20 i/o pins at the same cost. (atmega4 on mouser is $1.77 so if it's possible to use it, it'd be at the same price)

The ATtiny25 is cheaper on mouser also, ($1.18 for single) but it still only has 6 i/o pins. Super small projects would be fine, but not for the gadgets I have in mind every once in a while.

I've searched for arduino on the 4 and 8, and found stuff about it on the 8, but not the 4. Is that because of the size of the bootloader maybe?

CrossRoads

You can always download your sketch into them directly and just not have a bootloader.
You down load via the MISO/MOSI/SCK pins, vs having the bootloader accept sketch from the UART and then loading it into Flash memory.

Get yourself a programmer like this:
http://www.mdfly.com/index.php?main_page=product_info&cPath=5&products_id=415

http://store.nkcelectronics.com/pocket-avr-programmer.html

I have both, have only used the first one so far.
Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

cr0sh

What's an ATMega4? Maybe you mean an ATMega48 (88, 168, 328 - notice the progression)...?
I will not respond to Arduino help PM's from random forum users; if you have such a question, start a new topic thread.

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