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31  Forum 2005-2010 (read only) / Interfacing / Re: use LPRS serial radio at 15k bps on: June 02, 2010, 05:31:31 pm
The UART can easily handle that speed.  But I am unsure of the limitations of the software serial library.
32  Forum 2005-2010 (read only) / Development / Re: Support for lots of Atmega chips including 2560 on: September 21, 2010, 06:54:49 pm
Quote
The cross reference table is a good idea. I will see what I can do.

I'd be happy to build something out in PHP/MySQL that would make this very simple.

I've actually been thinking about making a shared database system that would supply a lot of info for Arduino users.  There are so many threads or wiki posts out there that should be in a database form and easily available to all.  I guess long term idea would be to create a database that has widgets available for anyone to add access to this information to their website.
33  Forum 2005-2010 (read only) / Development / Re: Support for lots of Atmega chips including 2560 on: September 15, 2010, 07:12:21 pm
Thanks for all the hard work!  Love the new URL!
34  Forum 2005-2010 (read only) / Development / Re: Add AVRProg (avr910) as official programmer? on: June 21, 2010, 09:41:50 pm
I don't think it would ever be added to the IDE as a programmer option.  It seems outdated when you compare it to something that doesn't require a FT232 chip...
http://www.xs4all.nl/~dicks/avr/usbtiny/
and
http://www.ladyada.net/make/usbtinyisp/

Also by editing the programmers.txt or boards.txt file, anyone can add any programmer they want as long as it is supported by avrdude.
35  Forum 2005-2010 (read only) / Troubleshooting / Re: Mega2560 with EFTDI FT232RL ? on: November 09, 2010, 08:40:38 pm
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The item was described as 'Arduino Mega ATmega2560'
confused....

Most likely it is a clone of the original Mega with an Atmega2560 instead of an Atmega1280.

I have personally sold a few of these, but I believe I make it clear enough that it is a clone that has the Atmega1280 replaced with a 2560.  Unfortunately not all sellers explain that well enough.  As far as I know, any original Arduino Mega with an Atemega2560 is a clone.

With that being said, it really doesn't matter (unless you require the new USB interface) if you have the new one or a clone that is upgraded.  The Atmega2560 is officially supported now even though it still can not be fully utilized (certain factors may make this statement false).  As long has you have the latest bootloader installed you should be able to use it as if it was the new Mega2560.
36  Forum 2005-2010 (read only) / Troubleshooting / Re: Mega 2560 and avrdude. on: October 08, 2010, 09:36:03 pm
Depends on your definition of "bricking"  Changing the fuse settings may brick it to a normal programmer but a High Voltage Programmer could solve that.

If you don't have any other Arduinos or Programmers to work with... I would exchange it to where you got it from.  Because most likely you will need a programmer to fix the bootloader (assuming that is the problem)  In most cases another Arduino can easily act as a programmer.  Also adding a small circuit could make it a High Voltage programmer fixing and "bricked" chips.
37  Forum 2005-2010 (read only) / Troubleshooting / Re: Mega 2560 and avrdude. on: October 08, 2010, 09:18:20 pm
Start with the bootloader first... unless you are an experienced solderer.

If you are experienced at soldering, I would just retouch every connection on the chips.  They may look fine but that doesn't mean they are good enough for transferring data at high speeds.  From my understanding, the new USB interface increases the speed. Increased speed means less tolerance to connections that may be less than perfect.  These less than perfect connections (if they exist) will not be noticeable to the naked eye.

If you are familiar with avrdude, you can also try loading your sketch with that, using the -B option... something like -B2... if that works then it points to a poor connection issue.
38  Forum 2005-2010 (read only) / Troubleshooting / Re: Mega 2560 and avrdude. on: October 08, 2010, 08:53:10 pm
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I tried to load the BlinkWithoutDelay sketch to test.

I assume that didn't work either.

It sounds like either the bootloader is corrupt or there might be a pin not quite soldered all the way.  Based on the experience I have with all the boards I have built from hand, most likely it is the latter and something isn't soldered quite right. (to fix run your solder iron over every pin of the 2560 and the USB controller, coating with solder flux helps a lot)  But if the loopback test works, it may be the boot loader.

I don't have a board with the new USB interface, so I can help much with bootloader issues.
39  Forum 2005-2010 (read only) / Troubleshooting / Re: Mega 2560 and avrdude. on: October 08, 2010, 06:29:29 pm
Were you able to upload other un-modified sketches?

First thing I would try is a different USB cable... then maybe try a loopback test.  Google "arduino loopback test" and you will get some info on that.
40  Forum 2005-2010 (read only) / Troubleshooting / Re: Arduino MEGA on: September 19, 2010, 07:59:38 am
Usually nothing is a good thing.

What is the program you are trying to compile?  Do you have the correct com port selected?  Does it say "done uploading" after it compiles?  Are you pressing the correct button to actually upload it or are you just pressing the compile button?
41  Forum 2005-2010 (read only) / Troubleshooting / Re: Arduino project uses a lot of pins on: September 22, 2010, 06:33:59 pm
Yes the analog pins can be used as if they were digital pins
42  Forum 2005-2010 (read only) / Troubleshooting / Re: Arduino mini fuses and bootloader choice? on: September 08, 2010, 06:05:48 pm
Try adding this to you programmers.txt file

Code:
stk500v2.name=STK500v2 Programmer
stk500v2.communication=serial
stk500v2.protocol=stk500v2

Restart the IDE and you will then see a programmer option called "STK500v2 Programmer"   this might allow you to do it from the IDE

[edit]programmers.txt should be located in your arduino directory under hardware\arduino[/edit]
43  Forum 2005-2010 (read only) / Troubleshooting / Re: Using an ATmega1280 with an 8Mhz crystal and 5V on: September 01, 2010, 05:39:20 pm
I don't think you need a crystal to run at 8MHz. You can set the fuse bits to use the internal oscillator and also not divide by 8.  And here is some info on baud rates http://www.wormfood.net/avrbaudcalc.php
44  Forum 2005-2010 (read only) / Troubleshooting / Re: Dead chip after programming bootloader on: July 08, 2010, 08:55:36 pm
Also if you have an atmega328... you can try recovering it with the HV rescue programmer.
http://mightyohm.com/blog/2008/09/arduino-based-avr-high-voltage-programmer/

You'll have to modify the code slightly, but it should be obvious where.  Worked great for me on a 2560 when I needed to recover the fuse bits.
45  Forum 2005-2010 (read only) / Troubleshooting / Re: Dead chip after programming bootloader on: July 08, 2010, 08:52:35 pm
Over the past day or 2 I have reprogrammed a 2560 about 200 times. (with the bootloader code I just sent you)  It didn't fail on any of the programming passes.  I have been using the buspirate with the STK500v2 firmware installed.

I can't think of much to try except maybe try with a slower baud rate and double check all the components.
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