Arduino Tools Serial Port greyed out

Question

I am running Debian 7  Linux Crunchbang  and wanted to use The Arduino IDE to program my Arduino UNO  To do that I installed the package arduino  When I started the Arduino I was asked to add my user to the dialout group  So I did with sudo usermod -a -G dialout  lt my-username gt     However when I start the Arduino IDE using arduino in the commandline the IDE opens but I am not able to load my program to the Arduino  The  error message is  Serial port COM1 not found  Did you select the right one from the Tools   Serial Port menu   And when I went to select the Serial Port  the option  Tools   Serial Port  is greyed out    I thought it is because I did not grant read and write permissions on my usb port  ttyACM0   So I did sudo chmod a rw  dev ttyACM0 but the option is still greyed out

User · Answer

Close all instances of the arduino IDE open ~/.arduino/preferences.txt and look for the line:

serial.port=<not your port>

and change it to your port:

serial.port=/dev/ttyACM0

you may have to log out for it to take effect

User · Answer

The following steps install the IDE and remove the error java lang NullPointerException thrown while loading gnu io RXTXCommDriver which usually comes with arduino installed with apt-get command in Ubuntu   Install the IDE  sudo apt-get install arduino   for removing java error in IDE  sudo add-apt-repository ppa webupd8team java sudo apt update sudo apt install oracle-java8-set-default   This also shows the Serial Port which was grayed out due to the error

User · Answer

open  arduinoHome arduino in text editor and modify last string   java -Dswing defaultlaf com sun java swing plaf gtk GTKLookAndFeel processing app Base        to  java -Dswing defaultlaf com sun java swing plaf gtk GTKLookAndFeel -Dgnu io rxtx SerialPorts   dev ttyACMN  processing app Base         set property gnu io rxtx SerialPorts to  dev ttyACMN where ttyACMN is name of serial port which you use   it may temporary fix bug in rxtx library  helped me to upload sketch with arduino1 0 5 IDE   Maybe would helpful for someone

User · Answer

Same comment as Philip Kirkbride   It wasn t a permission  issue  but using the Arduino IDE downloaded from their website solved my problem  Thanks  Michael

User · Answer

In my case this turned out to be a bad USB hub   The  lsusb  command can be used to display all recognized devices  If the unit is not plugged in the option to set the speed will be disabled   The lsusb command should output something like the string  Future Technology Devices International  Ltd Bridge I2C SPI UART FIFO   if your device is recognized  Mine was an RFDuino

User · Answer

Try Disconnecting the usb and plugging it back in  Its only grayed out because the ide cannot find any com ports that the uno has been plugged into    another solution is to try all the com ports and see which one works   finally if all fails try restarting your computer

User · Answer

install rx-tx lib for java run this command in terminal  sudo apt-get install librxtx-java -y   output port  sudo usermod -aG dialout  USER  sudo apt-get install gnome-system-tools    help regconize usb device

User · Answer

I had the same problem  with which I struggled for few days  reading all the blog posts  watching videos and finally after i changed my uno board  it worked perfectly well  But before I did that  there were a few things I tried  which I think also had an effect   Extracted the files to opt folder  change the preference -- gt  behavior -- gt  executable text files -- gt  ask what to do  After that  double clicked arduino on the folder  selected run by terminal added user dialout like described in other answers   Hope this answer helps you

User · Answer

Try to run as an administrator    Run terminal  type sudo arduino  type your root password  and

User · Answer

sudo arduino is the only way I get the Arduino IDE working  serial port and upload  on ubuntu 12 04  64  Indeed the serial port to use is  dev ttyACM0 in my case too  The other two  ttyS4 and ttyS0  gave an error when trying to upload to Uno  Have fun

User · Answer

So I did with sudo usermod -a -G dialout  lt my-username gt     You need to log out after you add yourself to a group so those changes are applied  Just log out and log in again and the menu should be available

User · Answer

chdmod works for my under debian  proxmox      chmod a rw  dev ttyACM0   For installing arduino IDE     apt-get install arduino arduino-core arduino-mk   Add the user to dialout group     gpasswd -a user dialout   Restart Linux   Try with the File   Examples   01 Basic   Blink  change the 2 delays to delay 60  and click the upload button for testing on arduino  led must blink faster

User · Answer

In my case I solved this issue by uninstalling the version of Arduino that I installed via apt-get and instead installed via the official website   With the latest version of Arduino I didn t have the problem described on Ubuntu 18 04

User · Answer

I encountered the same issue  My solution was to install and use java7   sudo apt-get install openjdk-7-jre sudo update-alternatives --config java   Select the number referring to the java-7 path

User · Answer

For a Windows solution I ve found that disabling and re-enabling the Arduino in Device Manager  then restarting the Arduino IDE does the trick without fail  no unplugging necessary   Why this error occurs in the first place is beyond me  Perhaps the corresponding method for Linux will fix your problem   Slightly related  not really   I had an issue with an AVR board a while back which was fixed by setting the device to a new COM port in the driver settings  Again  however you linux bunnies do it  I m sure it ll be cookies and cream   Cheers brother

User · Answer

You probably don t have the correct permissions  Try adding yourself to these groups   sudo adduser username ttyl sudo adduser username serial sudo adduser username uucp   Then restart your system and check if you got added to the groups   groups username   Good Luck

User · Answer

I solved following serial port related problems in ubuntu 18 04 as follows  Problem 1    Cannot open  dev ttyACM0  Permission denied Solution     Grant permissions to read write to the serial port with this terminal command --- gt   sudo chmod a rw  dev ttyACM0 Here replace tty port with your respective ubuntu port  Problem 2   Failed to open  dev ttyACM0  port busy  Solution    This problem appears when serial port is busy or already occupied  So kill the busy serial port with command --- gt  fuser -k  dev ttyACM0  Here replace tty port with your respective ubuntu port  Problem 3   Board at  dev ttyACM0 is not available Solution   In this case your serial port in tools menu will be greyed out  I googled a lot for this  but I none of  solution worked for me  Atlast I tried different arduino board and usb connector and it was working for me  So  if you are having old arduino board  can be solved using required drivers  or defected arduino board then only this problem arises

[arduino] Arduino Tools > Serial Port greyed out

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