• Can be that when connected to mac the console was redirected to usb-serial so that could explain 'no response from the board'. when just power is attached the console is not on usb.

    Yes, that's what is happening.

    You can force the console to stay in one place by adding Serial1.setConsole(1) (for Bluetooth) or USB.setConsole(1) to the code you upload.


Avatar for Gordon @Gordon started