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Author Topic: Serial port 'COM19' already in use  (Read 9149 times)
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I was having a very similiar problem with the Mega board I got for Christmas. I have been able to clear it up so far by killing the Palm Hotsync app in the tray at the bottom right of my screen. Perhaps you have a PDA or something similar?
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found a temporary soln i think for this. try closing the IDE and press cntrl-alt-del and bring up task manager and stop avrdude.exe(which would be still running I think) stop the process and remove the usb of arduino from the drive and plug back. that should make it work. I tried it a couple of times and it works for me. I am using XP and arduino 0018. I still think its the problem with IDE not letting go of the port if some crashes in uploading occur.
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Check your port activity with

http://technet.microsoft.com/en-us/sysinternals/bb896644.aspx

If you have bluetooth you can try replacing the RXTX Serial Communication Library used by Arduino IDE with my patched one:
http://www.tvdrawing.com

Good luck
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