About two month ago I bought a Arduino MEGA2560 for my 3D printer construction.
Driver installation from Arduino 0022 was the easiest thing I've ever done and everything worked very well!! After about a month of regular working to calibrate my new 3D printer with many successful uploads, my Arduino MEGA 2560 is suddenly stopped working without having done anything on my computer. If I try to upload any sketch, the error is always
processing.app.SerialException: Serial port 'COM3' already in use. Try quiting any programs that may be using it.
EVERYTHING WORKED PERFECTLY UNTIL NOW when I have almost finished the hardware of my 3D printer.
From now it is started the mess that I have not yet solved, and is blocking the development of my project . I already tried all other releases of Arduino IDE /drivers without success.
I also tried a W7 recovery point at the date before first Arduino installation repeating the same steps taken the first time installation but the problem will remains.
My computer runs Win 7 64bit but the problem is the same connecting the MEGA2560 board on another W7 64bit computer.
Detail: at power on Arduino AREF led flashing one time than still on. The ON led is lit.
The USB to Serial chipset is ATMEL
I want to buy another MEGA2560....but is it an hardware fault?
Please can someone help me?
Thanks in advance