Arduino with ATmegA644

Forum 2005-2010 (read only) Hardware Development
1

Hai all

Is there arduino with atmega644?
I didn't search well at web(didn't found)

Jeckson
Makassar

2

"Sanguino": http://sanguino.cc/

3

While not an "Arduino" per-se, the UzeBox uses a 644:

4

If you have some stripboard laying around you could build one like I did :).

5

Duino644:

6

I make a 644 (Sanguino) kit with a RTC + battery backup, 2ch 12bit DAC and
a uSD card. See Loading...

(* jcl *)

7

Thank all

If don't mind...Would like to ask about usb to serial(usb to tx and rx).

I has seen that Induino used attiny(90)2313 as usb to (tx and rx TTL) as replacement for FT232 or similiar(usb to TTL converter.
The FTDI chip very very hard to get here.

Only have attiny 45 and 85 spare and available at local store.

Is there information/project about usb to serial(tx and rx TTL) with that ICs?

Thank you very much
Jeckson
Makassar

8

Is there information/project about usb to serial(tx and rx TTL) with that ICs?

There is a good source on this topic here:

http://www.obdev.at/products/vusb/index.html

9

thank's all

great info.....will tried to build something like induino. Nusaduino(means islands arduino) . Indonesian style....

Thanks
jeckson
makassar

10

thank's all

great info.....will tried to build something like induino. Nusaduino(means islands arduino) . Indonesian style....

Thanks
jeckson
makassar

11

Just to throw another example out there . . .

12

thank's all

i just only tried to built...

Usb---attiny---sanguino/duemilanov/mega/another(duino).

Without ftdi usb...cause that part very rare here.

Nusaduino...

Jeckson
makassar

13

great all

found that www.recursion.jp/avrcdc/ very usefull.
With attiny 45 for usb.
The only problem is 4800bps max.
Think that communication after loading duino program..communicated to and from pc.

Jeckson
makassar

ps:any info or suggest very welcome to increase speed with crystal osc.

14

You are probably not going to be able to get much more than that out of the attiny because the timing is critical for USB communication.

The simplest code runs at 12mhz, so if you overclock the attiny to 24mhz you might be able to double the speed. You might also fry the attiny doing that though, so do some research first. I know the 2313's are only rated to either 16mhz or 20mhz and I think the 45's are only rated to 16mhz at the most, so overclocking may or may not be an option.

Another chip you can look for is the MCP2200, it's functionally the same as the FTDI chip, and also happens to be a couple bucks cheaper. From the datasheet I'm not entirely sure if it is capable of bit-banging or not (which is necessary for the auto-reset and bootloader installation if you aren't using pre-loaded Atmegas).

However, if you can't find an FTDI chip you probably won't find the MCP chip either, the FTDI's are much more common. Ordering online may be your only option if you want higher baud rates (it will probably be cheaper too).

A last ditch option which may work for you is to find one of those little USB to RS232 adapters. I've seen them as cheep as $3 before, and they have everything needed to add a USB - UART bridge to your project with only minor hacking. Just remove the serial port and add header pins and away you go.

15

yea 12Mhz is about as slow as you can go on usb, other than that you can use other frequencys but its not going to do much until you hit a multiple of 12 (12 24 48)

normal speed usb is faster than 4800 baud, but you have to keep in mind that that little 8 bit cpu is using 99% of its power to keep in connection with the usb host, and its doing that due to its all being emulated in software

16

Another chip you can look for is the MCP2200, it's functionally the same as the FTDI chip, and also happens to be a couple bucks cheaper. From the datasheet I'm not entirely sure if it is capable of bit-banging or not (which is necessary for the auto-reset and bootloader installation if you aren't using pre-loaded Atmegas).

Have seen that but didn't found the price at my region exactly.The original sales representatives gave me high cost.
Price at onlline shop?

A last ditch option which may work for you is to find one of those little USB to RS232 adapters. I've seen them as cheep as $3 before, and they have everything needed to add a USB - UART bridge to your project with only minor hacking. Just remove the serial port and add header pins and away you go.

url info please...

Another option is used DKU cable(at this forum) but at my HP shop gave me the price more than completed FTDI(+etc for usb to serial conv.)

THank you
Jeckson