debian-information/ttyusb-not-present-when-using-ch340.md

ttyUSB0 not present when using CH340

First encountered when using an Arduino Uno with Linux Mint 21.2 Cinnamon. The Arduino Uno used has a CH340 USB to serial converter.

According to some information found on Ask Ubuntu there seems to be a braille device with this chip and Linix seems to give it to brltty.

Note: this tip was tested on a Dutch version of Linux Mint. Keep this in mind for other derivatives of Debian and some translation errors by me.

Steps

• Open a terminal window

• Execute the following command to see if Linux can actually see the device

  lsusb
  

• Check the output ans see if a CH340 is present, see example below

  Bus 003 Device 005: ID 1a86:7523 QinHeng Electronics CH340 serial converter
  

• If the device indead is present, and you don´t use any braille device, execute the following

  sudo apt-get autoremove --purge -y brltty
  

Source

• Ask Ubuntu