Hi, I've recently been unable to upload sketches to my Arduino Uno, previously it all worked fine. The error message says:
Uflash:w:C:/Users/David/AppData/Local/Temp/arduino-create-agent661972794/Heater_Bank_Control.hex:i avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x9d
and then tries 9 more times to get sync, but fails!
I don't know what "sync" this is, sync between what and what?, I've been through the troubleshooting guide and other questions on the forum but nothing seems to quite answer. I tried re-installing the software, using a different Arduino Uno, all to no avail.
I am using chrome on Windows 7. I'm not aware of any changes to my PC between the last time it worked and when uploading stopped working but to be sure I tried using a different PC, which didn't work either, I've also tried uploading a sketch that I know works, still no joy.
Can anyone help?