Software & AppsOperating SystemLinux

How To Find and Select Serial Port for Arduino Uno on Ubuntu

Ubuntu 18

In the world of microcontrollers, Arduino Uno is a popular choice among hobbyists and professionals alike. However, setting up your Arduino Uno on an Ubuntu system can sometimes lead to a “Serial Port COM1 not found” error. This article will guide you through the process of finding and selecting the correct serial port for your Arduino Uno on Ubuntu.

Quick Answer

To find and select the serial port for Arduino Uno on Ubuntu, open the Arduino IDE, go to the "Tools" menu, and select "Port." If the option is grayed out, set the board type to "Uno" or the appropriate board. Look for ports like /dev/ttyACM0 or /dev/ttyUSB0. If you’re still having trouble, try using the dmesg command to identify the correct port or adjust port permissions using the chmod command.

Checking the Arduino IDE Version

Before we delve into the solutions, it’s important to ensure that you’re using the most recent version of the Arduino IDE. Older versions may not be compatible with Ubuntu, leading to the aforementioned error. You can download the latest Arduino IDE version from the official Arduino website.

Installing Arduino IDE from Official Sources

Another common issue arises when the Arduino IDE is installed from the apt repositories. To avoid any potential compatibility issues, it’s recommended to install the Arduino IDE directly from the official website or using the snapcraft package.

Finding the Correct Port

Once the Arduino IDE is properly installed, you can find the correct port by following these steps:

  1. Open the Arduino IDE.
  2. Go to the “Tools” menu and select “Port.” If the option is grayed out, it may indicate that you haven’t set the board type. Set the board type to “Uno” or the appropriate board, and the port should enable and auto-fill. In Ubuntu, you should look for ports like /dev/ttyACM0 or /dev/ttyUSB0.

Using the dmesg Command

The dmesg command can be used to display messages from the kernel ring buffer. This can be particularly useful when trying to identify the correct port for your Arduino Uno.

  1. Open a terminal.
  2. Type dmesg | tail and press enter. This command will show the last ten lines of system log messages. When you plug your Arduino into a USB port, it should display a message indicating which port it is connected to.
  3. Alternatively, you can use dmesg | tail -f to continuously monitor the system log. This allows you to plug and unplug your Arduino and see any Arduino-related messages in real-time.

Checking User Permissions

If your user account does not have permission to use the serial port, you may encounter the “Serial Port COM1 not found” error. This can be resolved by adding your user to the dialout group. Here’s how to do it:

  1. Open a terminal.
  2. Type sudo adduser $USER dialout and press enter. This command adds your user account to the dialout group, which has permission to use the serial port. The $USER variable represents your username.
  3. Log out and log back in for the changes to take effect.

Adjusting Port Permissions

In some cases, you may need to adjust the permissions for the serial port. This can be done using the chmod command, which changes the permissions of a file or directory.

  1. Open a terminal.
  2. Type sudo chmod a+rw /dev/ttyACM0 or sudo chmod a+rw /dev/ttyUSB0 and press enter. This command grants read (r) and write (w) permissions to all users (a) for the specified port.

Using an Alternative Serial Terminal

If you’re still having trouble finding the correct port, you might consider using a serial terminal program like Minicom. This program allows you to see the /dev/tty to which your Arduino is bound, helping you identify the correct port.

Remember to try these solutions one at a time and test after each step to see if the issue is resolved. With patience and persistence, you should be able to find and select the correct serial port for your Arduino Uno on Ubuntu.

What should I do if the “Port” option is grayed out in the Arduino IDE?

If the "Port" option is grayed out, it may indicate that you haven’t set the board type. Set the board type to "Uno" or the appropriate board, and the port should enable and auto-fill.

How do I use the `dmesg` command to find the correct port?

To use the dmesg command, open a terminal and type dmesg | tail. This will show the last ten lines of system log messages. When you plug your Arduino into a USB port, it should display a message indicating which port it is connected to. Alternatively, you can use dmesg | tail -f to continuously monitor the system log and see any Arduino-related messages in real-time.

What do I do if my user account does not have permission to use the serial port?

If your user account does not have permission to use the serial port, you can resolve this issue by adding your user to the dialout group. Open a terminal and type sudo adduser $USER dialout. Then, log out and log back in for the changes to take effect.

How do I adjust the permissions for the serial port?

To adjust the permissions for the serial port, open a terminal and type sudo chmod a+rw /dev/ttyACM0 or sudo chmod a+rw /dev/ttyUSB0. This command grants read (r) and write (w) permissions to all users (a) for the specified port.

What can I do if I’m still having trouble finding the correct port?

If you’re still having trouble finding the correct port, you can try using a serial terminal program like Minicom. This program allows you to see the /dev/tty to which your Arduino is bound, helping you identify the correct port.

Leave a Comment

Your email address will not be published. Required fields are marked *