I'm rather disappointed because I just bought arduino and I am unable to upload any projects. The error I get is:
avrdude: ser_open(): can't open device "\\.\COM3": Časový limit semaforu vypršel.
Can be translated as:
avrdude: ser_open(): can't open device "\\.\COM3": Semaphore time out
Am I expected to brute-force all available ports to see which one is reserved for arduino? How can I, on Windows 7, quickly determine which port to use given that the IDE for some reason can't do that for me.