I have a Uno clone, a Geekduino. I was using it with my old Windows Vista desktop with no problems, IDE v1.0.5. When Microsoft finally quit supporting Vista, I was forced to switch to a Windows 10 machine with IDE v1.8.15. I have never been able to upload a sketch from it. I'm getting the typical error message indicating a comms problem:
Arduino: 1.8.15 (Windows 10), Board: "Arduino Uno"
Sketch uses 3686 bytes (11%) of program storage space. Maximum is 32256 bytes.
Global variables use 233 bytes (11%) of dynamic memory, leaving 1815 bytes for local variables. Maximum is 2048 bytes.
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0xb7
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0xb7
avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0x00
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0x00
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0x00
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0x00
avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0x00
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x00
Problem uploading to board. See https://support.arduino.cc/hc/en-us/sections/360003198300 for suggestions.
This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.
The thing is, I can communicate with the board, using XBee, with no problem on the Win10 machine, using COM port 3 - I just can't upload a sketch. The IDE insists on COM 4, and I'm wondering if that is the problem. I see no way to switch ports.
Any suggestions on what I might look for?