Hi since 3 days I have a problem uploading code to an arduino uno. I have tried 3 different boards (uno, nano) , different usb-cables, 2 different pc's running latest Windows 10. However, always the same message. COM Port seems to be recognized correctly and shows Arduino when plugged to usb. Bef…

Avrdude: stk500_recv(): programmer is not responding ....,,

groundFungus July 1, 2021, 4:19pm 4

Have you tried the loopback test to test the serial port?

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