My two Arduino Uno's does not want to agree on my uploads.
It all started with a stepper motor. It ran fine at 9v, but according to the online community it would run even better with a 12V 0,5A external power source. I tried it, and it worked for a while. The motor kinda worked in motion, but it worked.
Now, after a couple of hours of playing around, it stopped accepting my uploads. It just said
avrdude: stk500_recv(): programmer is not responding"
After pushing the "restart" button many times, the error message was updated to
avrdude: stk500_getsync(): not in sync: resp=0x00 avrdude: stk500_disable(): protocol error, expect=0x14, resp=0x51
I've tried it with both a macbook pro and a windows pc. This is the avrdude from the windows pc.
C:\Users\nudelkopp\Desktop\arduino-0022\hardware/tools/avr/bin/avrdude -CC:\Users\nudelkopp\Desktop\arduino-0022\hardware/tools/avr/etc/avrdude.conf -v -v -v -v -patmega328p -cstk500v1 -P\\.\COM7 -b115200 -D -Uflash:w:C:\Users\NUDELK~1\AppData\Local\Temp\build3471245229859481650.tmp\Blink.cpp.hex:i avrdude: Version 5.4-arduino, compiled on Oct 11 2007 at 19:12:32 Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/ System wide configuration file is "C:\Users\nudelkopp\Desktop\arduino-0022\hardware/tools/avr/etc/avrdude.conf" Using Port : \\.\COM7 Using Programmer : stk500v1 Overriding Baud Rate : 115200 avrdude: ser_open(): setting dtr avrdude: Send: 0   avrdude: Send: 0   avrdude: Send: 0   avrdude: Recv: avrdude: stk500_getsync(): not in sync: resp=0x00 avrdude: Send: Q   avrdude: Recv: avrdude: stk500_disable(): protocol error, expect=0x14, resp=0x51 avrdude done. Thank you.
Are the two boards broken? I borrowed them from school, and i'm not really keen on buying them new ones :p