My Arduino Uno r3 board has recently stopped accepting uploads of new sketches. When I try to upload, nothing flashes on the board, and the following output is returned:
avrdude: Version 5.11, compiled on Sep 2 2011 at 19:38:36 Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/ Copyright (c) 2007-2009 Joerg Wunsch System wide configuration file is "C:\Program Files\Arduino\hardware/tools/avr/etc/avrdude.conf" Using Port : \\.\COM14 Using Programmer : arduino Overriding Baud Rate : 115200 avrdude: Send: 0   avrdude: Send: 0   avrdude: Send: 0   avrdude: Recv: avrdude: stk500_getsync(): not in sync: resp=0x00 avrdude done. Thank you.
I’ve tried doing a loopback test by putting a jumper between RESET and GND, and another between digital pins 1 and 2, but I do not get an echo back.
I’ve tried the following to resolve the issue - all unsuccesfully so far.
Checked that COM port selected was correct, then tried using a com port with number <10.
Disconnected eveything but the USB cable from the board.
Pressed reset button at various points before and during the compilation/upload process.
Tried a different USB cable.
Tried uploading from a different PC.
Tried replacing the ATMega chip with a different (brand new) ATMega chip with bootloader already installed.
- I’ve tried this on a Windows Vista PC, as well as a PC running Windows 7.
- The reset button and bootloader appear to be working - if I press this, the pin 13 LED flashes a few times, goes off for about 2 seconds, then comes back on.
- The program last successfully uploaded to the board still runs perfectly.
Can anyone suggest what else I could try?