There are a few potential causes for the “avrdude: stk500_recv(): programmer is not responding” error message when trying to upload a sketch to an Arduino board. Here are a few things you can try to troubleshoot the issue:

  1. Check your connections: Make sure that the Arduino board is properly connected to your computer via the USB cable, and that the cable is functioning properly. You may also want to try a different USB port or cable to see if that resolves the issue.
  2. Check your board and port selection: Make sure that you have selected the correct board and port in the Arduino development environment. To do this, go to the “Tools” menu and verify that the correct board and port are selected.
  3. Check your power supply: Make sure that the Arduino board has a sufficient power supply. If the board is powered through the USB cable, make sure that the computer or other device it is connected to is turned on and functioning properly. If the board is powered through an external power supply, make sure that the power supply is functioning properly.
  4. Check for other programs using the same port: If you are using a serial port (e.g. COM3) to communicate with the Arduino board, make sure that no other programs are using the port. You can check this in the Windows Device Manager (on Windows) or by running the ls /dev/tty*command in a terminal (on Mac or Linux).
  5. Reinstall the Arduino software: If none of the above steps resolve the issue, you may want to try reinstalling the Arduino software. This can help resolve any issues with the installation or configuration of the software.