There are two sets of device names that the Arduino could be under depending on which type it is. Ls: cannot access '/dev/ttyUSB*': No such file or directoryĬrw-rw- 1 root dialout 166, 0 Aug 24 11:05 /dev/ttyACM0ĭon’t worry about the “cannot access…” message unless you get two of them. First look to see if there is a device file for the Arduino and if it has the right permissions: $ ls -l /dev/ttyACM* /dev/ttyUSB* Next step, if that doesn’t fix your problems, is to see if the computer knows about the Arduino.
Now try it, see if that has got you working. The groups are only set when you log in to the computer, so you will either need to log out and back in again or (a more definite solution, especially if you have auto-login turned on) reboot the computer.
Now that has only changed the configuration files (/etc/groups in this case) and the change hasn’t actually had any effect yet. That means you will never be able to run sudo again. If you omit the “-a” by accident you will remove your user from any other groups before setting them to be in the dialout group. Without it you have “Set the user’s groups to be this list”. That says “Add the user to these groups”. If you don’t have access to root through sudo or some other means then you will have to seek the assistance of an administrator who does have permission.įirst add your user (you’re called fred, right?) to the dialout group: $ sudo usermod -a -G dialout fred Only root has the permission to do that, so use sudo to execute the commands as root. So you need to add your user to that group. The serial ports are all in the default group dialout, but your normal user isn’t. Permissions can be granted on files to the group that it belongs to, and users that are in that group can access those files. A group is a name given to a collection of users, files, devices etc., that go together. This is done through a Linux permission facility called groups. Fortunately granting permission to your user to access the serial ports is a simple matter, and one that you should always do by default to make life much simpler for you. That include serial ports and USB serial emulation ports (FTDI, etc). A normal user doesn’t, by default, have permission to talk to much in the way of hardware. The majority of problems a new user is faced with boil down to one simple thing: permissions. So I am going to introduce you to some of the basic tools you will need to work out why your board isn’t working as you’d like it to work.
I'm quite stuck on how to further troubleshoot or come up with a potential fix.Getting Arduino and Arduino-like boards working properly under Linux can be a troublesome task if you are not familiar with how Linux works. It's as if the 2 devices have switched identities.Ĭan I "delete" this devices from the registry somehow and start over? I've tried deleting the devices using Device Manager but when I re-connect them, they assume their old identities.
if I go to the Arduino driver folder to load the proper driver, Windows will not load as it's looking for UART drivers.
I can't update the driver for either because Windows doesn't see the correct driver ie. When I connect B, Device Mgr shows it as USB Serial Device (COM4) (device A). When I connect A, the Device Mgr shows it as the UART device (device B). I have 2 additional USB devices that need to be connected: The laptop functions perfectly and Device Manager is fine.
On start-up, my only connected USB devices to my laptop are a mouse/keyboard and a hub. My previous post wasn't too clear so I thought I would update with what I'm seeing. How can I get back to where I was, with the Arduino happy again?! Thanks, I've tried deleting and reinstalling but the Arduino still shows up as the UART. I've tried updating the Arduino driver but Windows doesn't see it (thinks its a UART now?). Now here's the problem- whenever I plug in my Arduino, Windows thinks its the USB-UART adapter and assigns COM3 to it.
Last week, I needed to install a FTDI USB-UART adapter and had problems with its drivers. I had an Arduino UNO happily connected to my COM3 port via a USB hub.