I can't figure out how this can work.
I own a Genuino Uno, and sometimes I can upload my sketch to it, but some other times (most of the times unfortunately) it just gives the famous error:
avrdude: ser_open(): can't open device "\.\COM1": Access is denied.
And I really can't understand the logic in that
Why does it only work rarely?
Which version of the Arduino IDE are you using?
Are you using Windows? I think it's the same problem as: Arduino 1.6.8 constantly polling serial, resetting Arduino board, Access Denied - Installation & Troubleshooting - Arduino Forum. This issue is isolated to Arduino IDE 1.6.8 and the Arduino developers are working on a fix for it. So if you want to test out the fixed version of the IDE you can download it from Rework serial ports handling by facchinm · Pull Request #4792 · arduino/Arduino · GitHub(and please post your results) or you can also switch to using Arduino IDE 1.6.7 and that should also fix the problem.
I am using Windows. Will try and edit with the results.
Thanks a lot for your kind help
I downloaded the fixed version of the IDE and it does the exact same thing
Worked the first time, now it doesn't work
Update: Works perfectly with 1.6.7
Thanks a lot!