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Editorial Team
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Asked: 2026-05-13T09:20:04+00:00

I have an Arduino-based device which connects through USB. I’d like to detect it

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I have an Arduino-based device which connects through USB.

I’d like to detect it from my Qt 4 application, using QExtSerialPort (or whatever necessary), when it’s plugged in.

If this weren’t possible, I thought I could somehow get a list of the system’s port names and just try all of them in search for my Arduino (where I’d implement some kind of handshaking procedure for it to detect it correctly). My concern in this approach is that I’m not sure if a device (for example, printer) would get damaged if I send some kind of handshaking ack at a different baud rate.

So, I don’t really know where to start for any of them. Which would be the best approach? How would I implement it?

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1 Answer

  1. Editorial Team

    I believe you can find list of serial ports on Windows by looking into

    HKEY_LOCAL_MACHINE\HARDWARE\DEVICEMAP\SERIALCOMM

    registry key

    Each serial port on a UNIX system has one or more device files (files in the /dev directory) associated with it:

    System           Port 1           Port 2
IRIX®            /dev/ttyf1       /dev/ttyf2
HP-UX            /dev/tty1p0      /dev/tty2p0
Solaris®/SunOS®  /dev/ttya        /dev/ttyb
Linux®           /dev/ttyS0       /dev/ttyS1
Digital UNIX®    /dev/tty01       /dev/tty02

    more details on serial programing on POSIX systems here

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