On Tue, May 1, 2012 at 6:35 PM, Glenn McIntosh <neonsignal@memepress.org>wrote:
This would often just indicate that the uploader is not getting a response from the bootload downloading code in the Arduino. There could be a number of reasons for this, off the top of my head:
* previously loaded firmware is hanging (though typically you have a 5 second window before the firmware bootloader jumps to the code start under these circumstances) * wrong virtual serial port (or a problem with the virtual serial port over USB) * processor not starting (clock, power, etc) * firmware bootloader has not been installed
I have also seen this when the atmel was fried by back EMF from a relay
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