In this case, the error appeared on a Linux when trying to upload code due to the drivers not being installed and the root permissions.

language:bashĪvrdude: ser_open(): can't open device '/dev/ttyUSB0': No such file or directory You may receive an avrdude: ser_open(): can't open device error similar to the output shown below. Its a software program that lets you perform settings at your computer. If you installed the drivers for the CH340 on your computer but have issues connecting via serial terminal or uploading code using the Arduino IDE, there may be an issue with your user settings preventing you from using the CH340. Download popular programs, drivers and latest updates easily. COM Port Not Available Windows, Mac, and Linux Users seem to be able to eventually get the board recognized by a combination of giving the computer time to finish the install ( close to 20 min), plugging the board back in multiple times, reinstalling the drivers, and/or resetting the computer multiple times ( repeat both steps). Others have had issues where the installation process hangs.īased on the customer experiences, this might be specific to the manufacturer and are usually isolated cases. However, the board cannot be accessed on the Arduino IDE. We have had a few reports on Windows 10 where the driver will automatically install and the board will show up under a new COM port as USB-Serial CH340, but with a different device name. Troubleshooting COM Port is Not Showing Up as CH340 Windows