Find which port Arduino is connected

Question

I know how to list the available Serial Ports but whow can I find the right COM port everytime I connect my Arduino? COM Port should be printed like MessageBox.Show(COMport);

I want to read/write Arduino data in a Visual C# application.

[this didn't work for me]

maybe try to sequentialy write to all serial ports open. (the risk is to talk to something else) Maybe there is a device identification available — dzada

user2019047 user2019047 · Accepted Answer · 2013-09-02T23:50:37

Open Device manager, expand "Ports (COM & LPT)". Plug in the Arduino USB connection, a new COM port shows up with name Arduino UNO (COMxx). This is on my machine as I have an Arduino UNO.

You can find this string using WMI (Windows Management Instrumentation). I am using the method below in a class, and has COMports as a public List

using System;
using System.Collections.Generic;
using System.Linq;
using System.Management;
using System.Text;
using System.Windows;

 public void getCOMportsValues()
    {
        try
        {
            if (COMports.Count > 0) COMports.Clear(); // COMports is a List<string>

            ManagementObjectSearcher searcher = new ManagementObjectSearcher("root\\CIMV2", "SELECT * FROM Win32_PnPEntity");

            foreach (ManagementObject queryObj in searcher.Get())
            {
                string s = queryObj["Name"] as string;
                if (s.Contains("(COM"))
                    COMports.Add(s);
            }
        }
        catch (ManagementException e)
        {
            MessageBox.Show("An error occurred while querying WMI data: " + e.Message);
        }
    }

Find which port Arduino is connected

3 Answers