I have an Arduino UNO that was working fine on Ubuntu several weeks ago. I was only on basic tutorials, but the sketches all uploaded fine. Since my Ubuntu crashed, I’ve been trying to get Arduino going on Windows 7.
I’ve been trying to upload the “blink” example sketch, but I keep getting “Serial port COM3 is already in use…” as an error. I’ve been trying everything I could find on these forums. Typically, I keep reading some combination of the following:
- uninstall/re-install arduino software
- uninstall/re-install drivers
- restart computer
- press and hold down reset button in some special fashion
I’ve tried all of these things (except re-installing the Arduino software). Nothing has worked! Also, whenever I press the reset button on my UNO, the “Serial Port” menu gets greyed out.
Is there any other special advice I should follow? Is there a more elaborate way to reset the Arduino that I’m not following (involving the battery and the ground)?