How to cancel the launch of the Arduino code during the exhibition in the USB Port?

Projects General Guidance
13

So now that you are able to upload again I suggest that you add a safety mechanism to your code so you don't encounter the problem again.

The basic idea is to use an input (with INPUT_PULLUP). Only if that input is pulled low (wire, switch) you allow your program to use the HID functionality.

Keyboard press how it works? - #12 by sterretje contains an example how you can omplement it.