On Linux, it should be /dev/ttyACM0 or similar. On the Mac, the serial port should be something like /dev/tty.usbmodem621. ![]() ![]() If your port doesn’t appear, try restarting the IDE with the board connected to the computer. The next thing to check is the port you are using to communicate to the Arduino. In the Arduino IDE software click on Tools>Board and verify that you have selected the same board you are using. The first thing you should check is whether you have the correct Arduino selected when using the Arduino IDE programming software. ![]() These include the drivers for the board, the board and serial port selections in the Arduino software, access to the serial port, the physical connection to the board, and more. There are many pieces involved in getting a program onto your Arduino board, and if any of them aren’t right, the upload can fail.
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