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After that, select the port on which the D1 Mini module board is connected. Go
to: Tools > Port > {port name goes here}
If the D1 Mini module board is connected on the USB port, there should be
some port names. In this eBook the Arduino IDE is used on Windows, port
names are as follows:
For Linux users, port name is /dev/ttyUSBx for example, where “x” represents
specific integer number between 0 and 9.