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16  Using Arduino / Installation & Troubleshooting / Re: Issue installing leonardo drivers on: June 23, 2012, 10:29:04 pm
What happens when you try to install them?
17  Using Arduino / Installation & Troubleshooting / Re: Mega 2560 Detection Problems on: June 23, 2012, 10:11:48 am
Hmmm....  the rxtx library and DLL are the things that determine which COM ports appear in the menu, so I'd start there.  Can you get rid of the custom RXTX DLL and try with the standard one? 

Also, make sure there aren't any other programs trying to scan / use COM ports (e.g. for things like cellular wifi dongles, cellphone syncing, etc). 
18  Using Arduino / Installation & Troubleshooting / Re: avrdude: stk500_getsync(): not in sync: resp=0x30 on: June 23, 2012, 10:06:33 am
Can you upload with verbose output enabled (in the Preferences dialog) and post the output here?

It might be an anti-virus program or firewall is preventing access to the serial port.  Or that some other program has it open already. 
19  Using Arduino / Installation & Troubleshooting / Re: Arduino Uno not showing up in Ports on Windows XP on: June 19, 2012, 02:49:45 pm
Do you see the Arduino under "unknown devices" in the Device Manager?
20  Using Arduino / Installation & Troubleshooting / Re: Upload Timeout Error on Mega 2560 - Not Sure What Changed on: June 19, 2012, 02:47:55 pm
Josephiah: it looks like the communication is flakey for some reason, maybe the power is cutting in and out (or there's a short appearing and disappearing).  Is it possible the board was damaged somehow (either physically or with too much current / voltage)?  Do you see the same behavior with nothing connected to the board?
21  Using Arduino / Installation & Troubleshooting / Re: Can't upload to Mega2560 on: June 19, 2012, 02:42:05 pm
There is a bug in the Mega 2560 bootloader that causes uploads to fail if your compiled sketch binary contains the string "!!!" (because this triggers a serial terminal).  This might be happening by chance with this code, e.g. in an array or lookup table or just by coincidence. 
22  Using Arduino / Installation & Troubleshooting / Re: Leonardo doesn't send to Serial Monitor after software reset on: June 17, 2012, 12:46:11 pm
I'm surprised that it doesn't work when you use the watchdog timer.  Can you provide more details (e.g. a sample sketch and the behavior you see)?

On the other hand, a "jmp 0" might not work, because it doesn't necessarily shutdown / re-initialize the registers / peripherals / USB connections.  On the Uno, the USB-serial connection is done by a separate chip, so you the connection will stay up regardless of what you do to the main processor (ATmega328).  On the Leonardo, there's just one chip, so you have to be more careful about maintaining the USB connection.
23  Using Arduino / Installation & Troubleshooting / Re: Upload Timeout Error on Mega 2560 - Not Sure What Changed on: June 17, 2012, 12:41:48 pm
It sounds like there may be different things going on here, since some of you are seeing different symptoms / behaviors. 

Josephiah and DROBNJAK, can you post the verbose output of an upload attempt?  Have you tried a different USB cable?  Are you going through a USB hub (if so, try connecting the board straight to the computer)?
24  Using Arduino / Installation & Troubleshooting / Re: Compile error with Mega2560 selected on: June 16, 2012, 07:01:12 pm
Weird.  Where was the old eeprom.h file located?  Where did you get the one you replaced it with?
25  Using Arduino / Installation & Troubleshooting / Re: Upload Timeout Error on Mega 2560 - Not Sure What Changed on: June 16, 2012, 07:00:19 pm
For those of you having trouble, can you try changing "stk500v2" to "wiring" for the Mega 2560 in your boards.txt file (in the hardware/arduino sub-directory of your Arduino application directory)?  That should tell avrdude to do an auto-reset of the board before the upload (in addition to the one done by the IDE itself), which might help.

See: for more information and updates.
26  Development / Other Hardware Development / Re: Seeduino film upload problem on: June 16, 2012, 06:55:10 pm
Unfortunately, we can't really support other people's products, since we don't know the details of how they're designed or what software they're running.  I recommend you ask Seeedstudio for help.
27  Using Arduino / Installation & Troubleshooting / Re: Arduino IDE does not start on: June 16, 2012, 06:54:05 pm
You might try running Arduino by invoking java from the command line, as this should print the exception, if any, that's being thrown.  I think you can run "arduino.exe --l4j-debug" to get the right command line. 
28  Using Arduino / Installation & Troubleshooting / Re: Compile error with Mega2560 selected on: June 15, 2012, 10:07:26 am
Weird, it works just fine for me with Arduino 1.0.1 (on Windows with the Mega 2560 or ADK selected).  I don't think it's changed since 1.0).  Can you post your sketch?
29  Using Arduino / Installation & Troubleshooting / Re: Communication Problems - stk500_getsync(): not in sync: resp=0x00 on: June 14, 2012, 06:09:59 pm
In Arduino 1.0 and later, you can get verbose output by checking a box in the preferences dialog (holding "shift" uploads via an external programmer, which is why it gives you a different error).  Can you post the output from that?

Do you have any bluetooth scanning / communication programs running (maybe in the background) or software for a cellular internet dongle or anything else that might be grabbing USB ports?
30  Using Arduino / Installation & Troubleshooting / Re: RX diode always ON on: June 14, 2012, 06:07:23 pm
Try this, from the Leonardo getting started page (

These differences affect the way you use the physical reset button to perform an upload if the auto-reset isn't working. Press and hold the reset button on the Leonardo, then hit the upload button in the Arduino software. Only release the reset button after you see the message "Uploading..." appear in the software's status bar. When you do so, the bootloader will start, creating a new virtual (CDC) serial port on the computer. The software will see that port appear and perform the upload using it. Again, this is only necessary if the normal upload process (i.e. just pressing the uploading button) doesn't work. (Note that the auto-reset is initiated when the computer opens the Leonardo's serial port at 1200 baud and then closes it; this won't work if something interferes with the board's USB communication - e.g. disabling interrupts.)
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