![]() It will usually start with /dev/tty, for example, /dev/ttyACM0. Learn more about how to remove login items on your Mac here. Startup apps can be configured in the System Settings app, under General > Login Items > Open at Login. If this resolves the issue, the process that’s blocking the port is likely being run on startup. If the process still doesn’t stop, you can use add the -9 flag to force it to quit: kill -9 If you can’t locate the source of the processs, you can terminate the process using the kill command. You can also try stopping the process in the Activity Monitor (again, you can use CMD + Space and search for ‘Activity Monitor’). Using the process name or path may be able to find and close an application that’s running the process. You can use this command: ps -o ppid= | xargs ps Note: In some cases, the parent process may be more informative. In this case the resulting output was: ~ % ps 33341ģ3341 ? S 5:28.07 /Applications/Arduino.app/Contents/MacOS/Arduino To get more information about the process, use the ps command: ps We can get more info with this command (replace with the PID in your input): The second value, in this case 19772, is the Process identifier (PID). This is because another instance of the IDE is running with the Serial Monitor open. The first value returned is the process name, which in this case was Arduino. The output may look something like this: ~ % lsof /dev/cu.usbmodem2301ĬOMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAMEĪrduino 33341 username 82u CHR 9, /dev/cu.usbmodem2301 Input the following command, replacing with the port name for your board. You can find it with Spotlight by pressing ⌘ + Space and typing “Terminal”. It will usually start with /dev/cu.usbmodem, for example, /dev/cu.usbmodem141401. The port name may appear in the error output, but you can also see it in the Tools > Port menu. Identify the name of the port you’re trying to access. ![]() Learn how to configure startup apps here. If this resolves the issue, and you already tried restarting your computer, the process that’s blocking the port is probably being run on startup. When successful, it should return something like: SUCCESS: The process "arduino-cli.exe" with PID 15880 has been terminated. In the Command Prompt, enter the following command, replacing with the name from the previous step. Note the processes’s PID value from the search results, then press Win + R on your keyboard to open the Run window. If you’re unable to stop the process this way, you can force it to close using the taskkill command. Look at the process name and see if it is an application that you recognize and can close. ![]() The search should return the process using the port. Paste your copied value into the search field and click Search. In Process Explorer, select Find > Find Handle or DLL. If you don’t have it, download and install it here. Right-click the value displayed in the field below and click Copy. Next, open the Details tab and select “Service” in the Property dropdown. Right-click on the device with the matching port name, and select Properties. If you can’t see the Ports section, make sure View > Devices by type is selected. This can be done by pressing Win + X on your keyboard to open the Power User menu and selecting Device Manager.Įxpand the Ports section and find the device associated with the port you are using with Arduino IDE (the device may or may not show the board name). ![]() ![]() The port name will start with “COM”, for example, COM3. Identify the name of the port you are using in Arduino IDE by checking the Tools > Port menu. This method requires the Process Explorer tool from Microsoft. It also has a powerful search capability that will quickly show you which processes have particular handles opened or DLLs loaded.Learn how to find and stop a process blocking a port for your system. Process Explorer shows you information about which handles and DLLs processes have been opened or loaded. It will show you detailed information about your Windows active processes including its icon, command-line, full image path, memory statistics, user account, security attributes, and more.Įver wondered which program has a particular file or directory open? Now you can find out. It’s an advanced process management utility that picks up where the built-in default Windows Task Manager tool leaves off, and adds a lot more features, fulfilling the requirements of users at advanced levels. Process Explorer is a freeware task manager and system resources monitor utility developed by Sysinternals (Mark Russinovich), which has been acquired by Microsoft. ![]()
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