I have a feeling this is a problem with the IDE. I have 2 Arduinos, an ELEGOO MEGA2560 clone, and a SunFounder MEGA2560 clone. Th ELEGOO one works completely fine on the COM3 serial port. However, the SunFounder is strange. It seems like it only works if I completely redownload the IDE package, but when I do manage to get a program uploaded, it uploads on COM6 and works completely fine. I have made a voltmeter with it, by the way. But, when I plug it in directly, it shows only COM4 and COM5 on the port menu, and neither of them work. The program compiles correctly but doesn't upload. Does anyone have suggestions on how I can solve this? Thanks.
That sounds OK to me, it is the computer that determines the USB/COM port, not the application. Generally any port can be assigned any number, at least that is the way it is on my Linux machine. I suggest you get another cable to solve the downloading problem. Unless something is not correct in your PC you should not have that problem, the IDE has been around along time and is stable.
if the sunfounder is on com6, then it will pretty much always be com 6 on that PC, assuming you use windows.
If you upload a code and cant see com 6 anymore, then somethings wrong and windows isnt seeing the arduino.
open the device manager and check com6 is there and see if its working ok.
What levels were measured when it worked?
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