Problem uploading to board

Hi all & ARDUINO expert,

I ve tried many times on uploading to the board ARDUINO UNO,however, the error message still persists.

avrdude:ser_open():can't open device"/dev/cu..SL-1000S_BLE-Serial Port":Resource busy.[/u]

Many thanks in advance.


I think you have the wrong port selected from the Tools > Port menu. “/dev/cu…SL-1000S_BLE-Serial Port” sounds like it’s a Bluetooth serial port on your computer.

Sometimes the port will be labeled with the board name in the menu. Other times it will not. If you don’t know which port is your Arduino, you can find it like this:

  • Unplug your Arduino board from the computer.
  • Tools > Port
  • Note the ports, if any, listed in the menu.
  • Close the Tools menu
  • Plug your Arduino board into the computer.
  • Tools > Port - The new port listed in the menu is your Arduino board.