Determining the COM port of your AVR device

If you want to use AVRDUDE with an AVR board that contains a serial bootloader, such as the Arduino Uno, you need to know the serial communication port (COM port) that was assigned to your device.

To find out which COM port Windows assigned to your device, you can use the Windows Device Manager:

• Right-click the Windows Start button and click Device Manager.
• In the tree view, expand the node Ports (COM & LPT) to view the connected devices.

For instance, if your Arduino Uno is listed as USB Serial Device (COM5), run the following command to verify the connection:

avrdude -c arduino -p m328p -P COM5

See Also

• Troubleshooting USB devices in Windows